CN102744931A - Pre-coated aluminium plate for electric device - Google Patents

Abstract

The present invention relates to a pre-coated aluminium plate for an electric device, which is excellent in conductivity, lubricity, anti-fingerprint capability, and scratch resistance even for packaging materials. On an original material plate (11) there is provided a composite skin film containing an inorganic component and an organic component, and the pre-coated aluminium plate (10) for the electric device is pressed on the composite skin film (12) with a resistor value below 1 ohm between a predetermined ball-shaped terminal and an aluminium original material plate (11), wherein the surface roughness Ra of the aluminium original material plate (11) is 0.3-0.5 microns, the composite skin film (12) contains a Zr component and a silicone component as the inorganic components, and comprises at least one of a polyurethane resin and a acrylic resin, the conversion adhesion amount of the Zr component is 5-500 mg/m2, the conversion adhesion amount of the silicone component is 2-600 mg/m2, the adhesion amount of the organic resin component is 5-650 mg/m2, and the total adhesion amount of ZrO2 of the Zr component is 70-700 mg/m2.

Description

Electronic equipment is used the precoating aluminium sheet

Technical field

The present invention relates to through shaping the precoating aluminium sheet that uses as the casing of electronic equipment or structure member etc.

Background technology

Aluminium sheet (comprising aluminium alloy plate) possesses high intensity and formability, compares significantly lightweight with steel plate simultaneously, therefore, goes for container, paper tinsel, electric product, motor vehicle articles for use through implementing various shapings, also has various uses such as building materials.

The formed products of aluminium sheet is that purpose is carried out surface treatment according to use and environment to improve outward appearance and corrosion resistance etc.At this, as carrying out the surface-treated method, from viewpoints such as the simplicity of a large amount of productivity ratio, manufacturing process, cost reductions, the preferred utilization carried out the precoating method that surface treatment forms the precoating aluminium sheet of epithelium in advance to the aluminium sheet before the drawing.

In addition; In recent years; Said precoating aluminium sheet is the variation that adapts to goods and machine and advanced, and the functional precoating aluminium sheet that is endowed following various functions obtains exploitation, and extensively universal; For example, anti-finger printing, resistance to marring, electric conductivity (ground connection property), thermal diffusivity, thermal insulation, antibiotic property, rust-preventing characteristic, hydrophily, drainage, lubricity etc.Use the precoating aluminium sheet as electronic equipment wherein, the precoating aluminium sheet that has electric conductivity, anti-finger printing, resistance to marring and lubricity concurrently is adopted the most widely.Also have, when so-called here resistance to marring is meant with punch process owing to the scar that produces with the mould friction is the resistance to marring of object.

The excellent surface treatment aluminum sheet of following anti-finger printing and resistance to marring has been proposed in patent documentation 1; Wherein, Precoating comprises the resin-shaped resin epithelium of lubricant on aluminium sheet, so do not make the fingerprint attached to the surface, or the fine scar that generates on the surface is eye-catching.

According to patent documentation 1; Though improved the anti-finger printing and the resistance to marring of aluminium sheet to a certain extent; But make by the surface of the aluminium sheet of precoating as the resin involucra of insulant and to present insulating properties; Therefore, when needing ground connection as the casing of said electronic equipment or structure member, the part setting that need eliminate said resin involucra makes the subsequent handling of the conducting portion that the metal section and part of aluminium sheet exposes etc.

Therefore, for the problem of the electric conductivity that solves the surface of guaranteeing this precoating aluminium sheet, the technology that precoating contains the resin involucra of conductive material has been proposed in patent documentation 2 and patent documentation 3.

But; Contain at this surperficial precoating in the method for resin of conductive material at aluminium sheet; The particle of conductive material is evenly disperseed in said resin; When the particle that in the resin involucra on the surface that is formed on aluminium sheet, can not fully guarantee conductive material contacts with each other, in the time of perhaps in the interface of resin involucra and aluminium sheet, can not fully guaranteeing the contacting of conductive material and aluminium sheet, the electric conductivity that just can not obtain hoping.Therefore, for the electric conductivity that obtains hoping, need to increase the one-tenth component of conductive material.But when increasing the content of conductive material, the resin involucra hardening becomes fragile, and therefore, when the aluminium sheet that is formed with resin involucra is carried out punch process, the problem of the crackle (peeling off) of resin involucra can occur taking place easily.

Present inventors are for the problem points of the precoating aluminium sheet that solves the formation that forms these resin involucras that are added with conductive material; In patent documentation 4; Be conceived to the relation of the average film thickness of surface roughness that aluminium sheet has and resin involucra, proposed not use conductive material and the technology of guaranteeing electric conductivity.Promptly; As shown in Figure 5, the electronic equipment of record is with precoating aluminium sheet 40, on the single face at least of the former material plate 41 of the aluminium of the center line average roughness with regulation in this patent documentation 4; Form corrosion resistance epithelium 43 and have the composition of regulation and the resin involucra 42 of average film thickness; The fine concavo-convex protuberance on the surface of the former material plate 41 of aluminium so constitutes, through forming this formation to be exposed from resin involucra 42 by the state of corrosion resistance epithelium 43 linings; When improving high electric conductivity, also satisfy other requirement such as resistance to marring.

Have the electronic equipment of putting down in writing in the patent documentation 4 of said formation and use the precoating aluminium sheet; Because electric conductivity, anti-finger printing, resistance to marring, lubricity excellence; So, be used in the various electronic equipments at the shell of CD-ROM drive and the framework of liquid crystal board, the backboard of liquid crystal board, inner bin of vehicle audio etc.

[patent documentation]

[patent documentation 1] special fair 6-70870 communique

[patent documentation 2] spy opens flat 7-313930 communique

No. 3245696 communique of [patent documentation 3] patent

No. 4237975 communique of [patent documentation 4] patent

But; In recent years; Set as patent documentation 4 in the electronic equipment industry of electronic equipment with the purposes of precoating aluminium sheet of record; Cost dog-eat-dog particularly consequently, also has the tendency that is replaced as more cheap material for electronic equipment has been carried out with the precoating aluminium sheet the packaging material that formed products that is shaped and the electronic equipment goods that use this formed products to assemble pack.Consequently; When packing has been carried out formed products that is shaped and the electronic equipment goods that use this formed products to assemble with the precoating aluminium sheet to electronic equipment after, transporting; The situation that the scar that can not produce with the current packaging material gets into formed products and electronic equipment goods begins increase; Increase cost hardly, and increase with the existing cry of comparing the precoating aluminium of further raising resistance to marring.

Summary of the invention

The present invention forms in view of said problem; Its purpose is to provide the excellent electronic equipment of a kind of resistance to marring to use the precoating aluminium sheet; Resistance to marring when its electric conductivity, lubricity, anti-finger printing, corrosion resistance and punch process is excellent; Even and use cheap packaging material, also can suppress the formed products that is suitable for and the scuffing of electronic equipment goods.

The electronic equipment of the present invention that has solved said problem possesses with the precoating aluminium sheet: former material plate of aluminium and the composite film that contains inorganic constituents and organic resin composition that is formed on the single face at least of the former material plate of said aluminium; The bulbous end period of the day from 11 p.m. to 1 a.m that leading section is radius 10mm is being pushed with the load of 0.4N in the surface that is formed with said composite film one side; Resistance value between the former material plate of said spherical terminal and said aluminium is below 1 Ω; Wherein, in the former material plate of said aluminium, the arithmetic average roughness Ra that is formed with the surface of said composite film one side is below the above 0.5 μ m of 0.3 μ m; In the said composite film; Contain zirconium composition and silicon composition as inorganic constituents, contain at least a in polyurethane resin and the acrylic resin as the organic resin composition, the zirconium composition is converted into ZrO ₂Adhesion amount be 5～500mg/m ², the silicon composition is converted into SiO ₂Adhesion amount be 2～600mg/m ², the adhesion amount of said organic resin composition is 5～650mg/m ², the adhesion amount of the adhesion amount of said zirconium composition, said silicon composition, the adhesion amount of said organic resin composition add up to 70～700mg/m ²(invention request 1).

So; Because the adhesion amount with the integral body of the arithmetic average roughness Ra on the surface of the former material plate of aluminium and composite film is limited in the specific scope respectively; The form that flies out so the fine protuberance that forms the former material plate of aluminium is higher than the average film thickness (highly) of composite film; Consequently, the resistance value when measuring through the method for regulation is below 1 Ω, can guarantee superior electrical conductivity.In addition, through limiting the composition that forms composite film, can realize to guarantee that extremely the electronic equipment of the resistance to marring (resistance to marring when sliding with packaging material) of excellence is used the precoating aluminium sheet.

Preferred electronic equipment of the present invention is with in the precoating aluminium sheet, and in the inorganic constituents of said composite film, said silicon composition is with respect to being converted into ZrO ₂, SiO ₂The mass ratio ([SiO of total of zirconium composition and silicon composition ₂]/[ZrO ₂+ SiO ₂]) be (invention request 2) below 0.95 more than 0.2.

So, be the optimized composite film of ratio of zirconium composition and silicon composition through the ratio of realizing the silicon composition in the inorganic constituents, thus, can realize that the electronic equipment of the resistance to marring excellence when sliding with packaging material is used the precoating aluminium sheet.

Preferred electronic equipment of the present invention is with in the precoating aluminium sheet, in said composite film, inorganic constituents be converted into ZrO ₂, SiO ₂The quality of zirconium composition and silicon composition add up to [ZrO ₂+ SiO ₂] be more than 0.2 times (invention request 3) below 10 times of quality of said organic resin composition.

So; Through the inorganic constituents in the qualification composite film and the ratio of organic resin composition; The hardness deficiency of the composite film that produces when thereby the ratio that can prevent the organic resin composition is too high resistance to marrings that cause and packaging material descend; And the resistance to marring during punching press that the connecting airtight property deficiency of the composite film that can prevent to produce when the ratio of inorganic constituents is too high causes descends, and can realize by chance that the excellent electronic equipment of resistance to marring uses the precoating aluminium sheet.

Preferred electronic equipment of the present invention is with in the precoating aluminium sheet, and it is to be lower than 50% lubricated composition (invention request 4) more than 5% that said composite film also contains with respect to this composite film mass ratio.

According to this formation, can realize that the electronic equipment of lubricity excellence is used the precoating aluminium sheet, improve the progressive forming property of punching press, can omit degreasing process, reduce cost.

Preferred electronic equipment of the present invention is with in the precoating aluminium sheet; Between former material plate of said aluminium and said composite film, form the substrate processing epithelium that is made up of inorganic independent epithelium that contains the metal of from chromium, zirconium, titanium, selecting or inorganic organic composite film, the adhesion amount of said substrate processing epithelium is scaled 5mg/m with said metal ²Above 50mg/m ²Below (invention request 5).

According to this formation, through improving the connecting airtight property of composite film and the former material plate of aluminium, thus the resistance to marring when realizing further raising punch process, and the electronic equipment of excellent corrosion resistance is used the precoating aluminium sheet.

Preferred electronic equipment of the present invention is with in the precoating aluminium sheet, and in the said composite film, said zirconium composition is converted into ZrO ₂Adhesion amount be 5～250mg/m ², said silicon composition is converted into SiO ₂Adhesion amount be 2～300mg/m ², the adhesion amount of said organic resin composition is 5～325mg/m ², the adhesion amount of the adhesion amount of said zirconium composition, said silicon composition, the adhesion amount of said organic resin composition add up to 70～350mg/m ², with leading section the spherical terminal of radius 10mm when pushing on the surface that is being formed with said composite film one side in load with 0.4N, the resistance value between the former material plate of said spherical terminal and said aluminium is (invention request 6) below 0.5 Ω.

So,, can realize that then electric conductivity improves if reduce the integral body of composite film and the adhesion amount of each composition, and to cost also useful electronic equipment use the precoating aluminium sheet.

Electronic equipment according to the present invention is used the precoating aluminium sheet; The adhesion amount of the integral body of the arithmetic average roughness Ra on the surface of the former material plate of aluminium and composite film is each defined in the particular range; And further make the composition optimization of composite film, thus, resistance to marring significantly improves; And electric conductivity, lubricity, anti-finger printing and corrosion resistance are also excellent.

Description of drawings

Fig. 1 is that medelling ground shows that electronic equipment of the present invention wants portion's amplification sectional view with the formation of the embodiment of precoating aluminium sheet.

Fig. 2 is that medelling ground shows the front view of measurement electronic equipment with the method for the resistance value of precoating aluminium sheet.

Fig. 3 is that medelling ground shows that electronic equipment of the present invention wants portion's amplification sectional view with the formation of other embodiments of precoating aluminium sheet.

Fig. 4 is that medelling ground shows the sectional view of measurement electronic equipment with the shear-bow test method(s) of the resistance to marring of precoating aluminium sheet.

Fig. 5 is that medelling ground shows that electronic equipment of the prior art wants portion's amplification sectional view with the formation of precoating aluminium sheet.

Symbol description

10,10A ... Electronic equipment is used the precoating aluminium sheet

11 ... The former material plate of aluminium

12 ... Composite film

13 ... The substrate processing epithelium

The specific embodiment

Below, with reference to suitable accompanying drawing, electronic equipment of the present invention is elaborated with the precoating aluminium sheet.

As shown in Figure 1, electronic equipment of the present invention has with precoating aluminium sheet 10: the former material plate 11 of the aluminium of the surface roughness of regulation and be formed on the lip-deep composite film 12 of the former material plate 11 of this aluminium with the adhesion amount of regulation.Composite film 12 also can be formed on the single face of the former material plate 11 of aluminium, also can be formed on (diagram is omitted) on the two sides.In addition, electronic equipment of the present invention as shown in Figure 3 is such with other embodiment of precoating aluminium sheet, and between former material plate 11 of aluminium and composite film 12, being formed with chromium phosphate hydrochlorate epithelium is the substrate processing epithelium 13 (detailing afterwards) of representative.

In the former material plate 11 of aluminium, the arithmetic average roughness Ra on surface is below the above 0.5 μ m of 0.3 μ m, forms fine concavo-convexly, and therefore, composite film 12 forms for the concavo-convex recess on the surface of the former material plate 11 of aluminium relatively thick, relatively approaches for protuberance.

In addition, contain in the composite film 12 of inorganic constituents and organic resin composition, contain zirconium composition and silicon composition as said inorganic constituents, the adhesion amount of zirconium composition (quality of unit are) is converted into ZrO ₂Be 5～500mg/m ², the adhesion amount of silicon composition is converted into SiO ₂Be 2～600mg/m ²In addition, in the composite film 12, contain at least a of polyurethane resin and acrylic resin as said organic resin composition, the adhesion amount of this organic resin composition is 5～650mg/m ²And, the adhesion amount of said each composition in the composite film 12 add up to 70～700mg/m ²Below, with the total of this adhesion amount, promptly contained zirconium composition is converted into ZrO in the composite film 12 ₂Adhesion amount, silicon composition be converted into SiO ₂The total of adhesion amount of adhesion amount and organic resin composition be called the adhesion amount of this composite film 12.

So; Electronic equipment of the present invention is with in the precoating aluminium sheet 10; On the former material plate 11 of aluminium of the surface roughness of stipulating, be formed with the composite film 12 that has pushed up composition and adhesion amount earlier; Therefore, can make load with 0.4N is that the spherical terminal 23 (with reference to Fig. 2) of radius 10mm is below 1 Ω by the spherical terminal 23 and the resistance value between the former material plate 11 of aluminium that are pressed in when being formed with composite film 12 1 sides surperficial with leading section.

Below, electronic equipment of the present invention each constitutive requirements with precoating aluminium sheet 10 are described.

[the former material plate of aluminium]

The former material plate of the used aluminium of the present invention 11 is made up of aluminum or aluminum alloy, and the alloy kind that is suitable for is not special to be limited, the selections arbitrarily such as intensity that article shape and manufacturing process can require when using.Usually can use the aluminium sheet of non-heat treatment type, promptly 1000 be industrial pure plate, 3000 Al-Mn that is be that the Al-Mg that alloy sheets, 5000 is is an alloy sheets.Particularly, when making the casing of the dark container shapes of processing with contraction, aluminium sheets such as the A1050 that stipulates among the recommendation JISH4000, A1100, A3003, A3004.In addition, when the casing of the casing of making superficial container shapes and bending machining main body, aluminium sheets such as the A5052 that stipulates among the recommendation JISH4000, A5182.For modified, thickness of slab, can limit various materials according to purpose and use.

(below the above 0.5 μ m of the arithmetic average roughness Ra:0.3 μ m on the surface of the former material plate of aluminium)

The arithmetic average roughness Ra on the surface of the former material plate 11 of aluminium be with after the adhesion amount of the composite film 12 stated, help the important parameters of electronic equipment of the present invention with the realization of various characteristicses such as the electric conductivity in the precoating aluminium sheet 10, corrosion resistance, anti-finger printing, resistance to marring.

When the arithmetic average roughness Ra on the surface of the former material plate 11 of aluminium is lower than 0.3 μ m; Electronic equipment is excessive with the surface gloss of precoating aluminium sheet 10; Become eye-catching, anti-finger printing and poor attached to the fingerprint on surface and the fine scar that generates on the surface to the resistance to marring of packaging material.In addition, at this moment, have the height step-down of protuberance in base of the former material plate 11 of aluminium of described micro concavo-convex, consequently, cover the thickness thickening of the composite film 12 of protuberance, therefore, be difficult to guarantee the electric conductivity of hoping.

On the other hand, when the arithmetic average roughness Ra on the surface of the former material plate 11 of aluminium surpasses 0.5 μ m, the excessive height of the protuberance of the former material plate 11 of aluminium, therefore, expose from composite film 12 easily at the top of protuberance.Consequently, the surface of the former material plate 11 of the aluminium that exposes is owing to mould is worn, and therefore, the resistance to marring during punch process reduces, and lubricity also descends.In addition, when protuberance exposes from composite film 12, be that spot corrosion takes place and diffusion towards periphery with it, therefore, corrosion resistance descends.

That is to say, be limited to the scope below the 0.5 μ m more than the 0.3 μ m, can give excellent electric conductivity, anti-finger printing, resistance to marring and corrosion resistance through arithmetic average roughness Ra with the surface of the former material plate 11 of aluminium.

Also have; Arithmetic average roughness Ra as with the surface of the former material plate 11 of aluminium is adjusted at the method in the said scope; For example can give an example; The method of in the rolling process of the former material plate 11 of aluminium, using the roll suitably set surface roughness to carry out cold rolling finish to gauge (finish rolling), or the surface of the former material plate 11 of the aluminium after rolling implemented the method for etch processes is under suitable condition used the shot-peening method of particulate etc. etc.

In the present invention; So adjust surperficial arithmetic average roughness Ra and be formed with the composite film 12 that is formed with predetermined component and adhesion amount on the former material plate 11 of fine concavo-convex aluminium; Therefore; The thickness of the composite film 12 of the fine protuberance of the former material plate 11 of metallized aluminum can be not blocked up, can be not thin excessively yet.For this reason, can access and guarantee electric conductivity, anti-finger printing and the resistance to marring of hoping, and the electronic equipment that corrosion resistance is improved is with precoating aluminium sheet 10.

[composite film]

(constituent of composite film: inorganic constituents and organic resin composition)

(constituent of organic resin composition: acrylic resin and polyurethane resin at least a)

(constituent of inorganic constituents: zirconium composition and silicon composition)

As stated; Be used for the composite film 12 of electronic equipment of the present invention with precoating aluminium sheet 10; Contain inorganic constituents and organic resin composition as constituent; Contain zirconium composition and silicon composition as inorganic constituents, contain from acrylic resin and polyurethane resin, select at least a as the organic resin composition.

For the organic resin composition; Kind through qualification resin like this; The film that composite film 12 usefulness the are thin recess on the surface protuberance that also can be covered that not only can be covered with fine former material plate 11 of concavo-convex aluminium; Therefore, can access corrosion resistance, resistance to marring, precoating aluminium sheet 10 that anti-finger printing is good.

Through zirconium composition and silicon composition are disperseed in said organic resin composition together; As stated; The recess that not only has the surface of the fine former material plate 11 of concavo-convex aluminium, protuberance also are covered by thin and even (full of な く), therefore; Compare with the composite film of the resin that uses other kinds, the effect that corrosion resistance and resistance to marring are improved is big.Particularly the effect of resistance to marring raising significantly improves by leaps and bounds, for example, compares with precoating aluminium sheet 40 (with reference to Fig. 5) with existing electronic equipment, can guarantee high resistance to marring.

(the adhesion amount of composite film: 70～700mg/m ²)

It is 70～700mg/m with the adhesion amount of composite film 12 that electronic equipment of the present invention uses precoating aluminium sheet 10 ²Mode form.Through qualification like this, can access the excellent electronic equipment of the balance of electric conductivity, resistance to marring, connecting airtight property of processing, corrosion resistance with precoating aluminium sheet 10.

The adhesion amount of composite film 12 is lower than 70mg/m ²The time since the surface of the former material plate 11 of aluminium, particularly protuberance can not be by abundant lining, so corrosion resistance and resistance to marring decline.In addition, the adhesion amount of composite film 12 surpasses 700mg/m ²The time, it is blocked up that thickness becomes, so electric conductivity reduces.

Particularly in order to guarantee excellent electric conductivity, the adhesion amount of composite film 12 is preferably 350mg/m ²Below.

(the adhesion amount of contained zirconium composition in the composite film: be converted into ZrO ₂Be 5～500mg/m ²)

The zirconium composition improves the corrosion resistance of epithelium.Therefore, contain a certain amount of above zirconium composition in the composite film 12, can only give the corrosion resistance of the degree that can not obtain with precoating aluminium sheet 10 electronic equipment with the organic resin composition.

The zirconium composition is being converted into ZrO ₂Adhesion amount (following for the adhesion amount of zirconium composition) be lower than 5mg/m ²The time, corrosion resistance descends, and compares corrosion-resistant with precoating aluminium sheet 40 (with reference to Fig. 5) with the existing electronic equipment of the substrate processing epithelium (corrosion resistance epithelium 43) of suitable chromium phosphate hydrochlorate epithelium etc.In addition, the adhesion amount of zirconium composition surpasses 500mg/m ²The time, composite film hardening, the decline of connecting airtight property of processing.Therefore, be 5mg/m preferably with the adhesion amount of zirconium composition ²Above 500mg/m ²Below, the quality ratio in the integral body of composite film (total of zirconium composition, silicon composition, organic resin composition) is counted more than 1/70 below 50/70.Also have, the zirconium composition is converted into ZrO ₂Adhesion amount, for example, can having good quality at the contained whole Zr element of the unit are of composite film 12 with (ZrO ₂Molecular weight)/(atomic weight of Zr) convert and obtain.

In addition, the adhesion amount of composite film 12 is at 350mg/m ²When following, the resin flow property when considering application etc., the adhesion amount of preferred zirconium composition is 250mg/m ²Below.

(the adhesion amount of contained silicon composition in the composite film: be converted into SiO ₂Be 2～600mg/m ²)

The silicon composition improves the hardness of epithelium.Therefore, through in composite film 12, containing the silicon composition more than a certain amount of, can give the resistance to marring of the degree that electronic equipment only can not obtain with the organic resin composition with precoating aluminium sheet 10.

The silicon composition is converted into SiO ₂Adhesion amount (following for the adhesion amount of silicon composition) be lower than 2mg/m ²The time, resistance to marring descends.In addition, the adhesion amount of silicon composition surpasses 600mg/m ²The time, it is really up to the mark that composite film becomes, the decline of connecting airtight property of processing.Therefore, be 2mg/m preferably with the adhesion amount of silicon composition ²Above 600mg/m ²Below, the quality ratio in the composite film whole (total of zirconium composition, silicon composition, organic resin composition) is counted more than 0.4/70 below 60/70.Also have, the silicon composition is converted into SiO ₂Adhesion amount, the having good quality of for example can be in the unit are of composite film 12 contained whole Si element with (SiO ₂Molecular weight)/(atomic weight of Si) convert and obtain.

In addition, the adhesion amount of composite film 12 is at 350mg/m ²When following, the resin flow property when considering application etc., the adhesion amount of silicon composition is preferably 300mg/m ²Below.

(ratio [the SiO of the silicon composition in the inorganic constituents ₂]/[ZrO ₂+ SiO ₂]: more than 0.2 below 0.95)

The ratio of the silicon composition in the inorganic constituents (total of zirconium composition and silicon composition), preferred mass is than ([SiO ₂]/[ZrO ₂+ SiO ₂]) be more than 0.2 below 0.95.Also have, the quality of zirconium composition and silicon composition is same with adhesion amount separately, is to be converted into ZrO ₂, SiO ₂Value, with [ZrO ₂], [SiO ₂] expression.

When so stipulating, obtain the excellent composite film 12 of balance of corrosion resistance and resistance to marring easily.([SiO ₂]/[ZrO ₂+ SiO ₂]) be lower than at 0.2 o'clock, become the poor slightly composite film of resistance to marring 12, surpass at 0.95 o'clock, become the poor slightly composite film of corrosion resistance 12.

(the adhesion amount of contained organic resin composition: 5～650mg/m in the composite film ²)

The organic resin composition has the effect of the connecting airtight property of processing of guaranteeing composite film 12.Through making composite film 12 contain a certain amount of organic resin composition, can give the connecting airtight property of processing that electronic equipment only can not obtain with inorganic constituents with precoating aluminium sheet 10.

The adhesion amount of organic resin composition is lower than 5mg/m ²The time, the decline of connecting airtight property of processing.In addition, the adhesion amount of organic resin composition surpasses 650mg/m ²The time, it is soft that composite film becomes, and resistance to marring descends, in addition, because the thickness thickening of composite film, so electric conductivity descends.Therefore, the adhesion amount of preferred organic resinous principle is 5mg/m ²Above 650mg/m ²Below, count more than 2/70 below 65/70 with the quality ratio in the integral body (total of zirconium composition, silicon composition, organic resin composition) of composite film.

In addition, the adhesion amount of composite film 12 is 350mg/m ²When following, particularly can guarantee excellent resistance to marring, and the adhesion amount of preferred organic resinous principle is 325mg/m ²Below.

(the zirconium composition in the composite film and the quality of silicon composition add up to [ZrO ₂+ SiO ₂] with respect to the ratio of the quality of organic resin composition: more than 0.2 times below 10 times)

The ratio of inorganic constituents in the composite film 12 (total of zirconium composition and silicon composition) and organic resin composition, the quality of preferred zirconium composition and silicon composition adds up to [ZrO ₂+ SiO ₂] be more than 0.2 times below 10 times of quality of organic resin composition.

When so stipulating, outside corrosion resistance and resistance to marring, can also obtain processing the excellent epithelium of balance of connecting airtight property easily.[ZrO ₂+ SiO ₂] when being lower than 0.2 times of adhesion amount of organic resin composition, become the poor slightly epithelium of resistance to marring and corrosion resistance, when surpassing 10 times, become the poor slightly epithelium of connecting airtight property of processing.

For contained zirconium composition, silicon composition in the adhesion amount of controlling composite film 12 and this composite film 12; Each adhesion amount of organic resin composition; Of the back, liquid composite film is formed with medicament (coating) coat on the former material plate 11 of aluminium, toast and form composite film 12; Therefore, only controlling cooperation and the coating weight that composite film forms with medicament gets final product.It is said each composition contained in the composite film 12 to be dispersed or dissolved in as required mix in water or the organic solvent etc. and obtain that composite film forms with medicament.Because baking, the composite film on coating the former material plate 11 of aluminium form the with medicament, volatile ingredient (water or organic solvent etc.) evaporation, the therefore O of coating ₂The solid constituent (removing the amount of volatile ingredient) that composite film forms with medicament is remaining, forms composite film 12.And the ratio (based on the amount of the volatile ingredient of removing each composition) of the zirconium composition in the composite film formation with medicament, silicon composition, organic resin composition becomes the ratio of each composition in the composite film 12.Therefore; The adhesion amount of composite film 12 can be controlled through the coating weight that composite film forms with medicament; In addition; Form the cooperation of the zirconium composition that mixes in the with medicament, silicon composition, organic resin composition through composite film, the ratio of these each compositions is determined, and derives adhesion amount according to said coating weight in addition.

In addition,,, zirconium (Zr), silicon (Si) are carried out quantitative analysis, be converted into ZrO respectively through fluorescent x-ary analysis for being formed on electronic equipment with the composite film on the precoating aluminium sheet 10 12 ₂, SiO ₂, the actual adhesion amount of calculating zirconium composition, silicon composition.Equally, (C) carries out quantitative analysis for carbon, calculates the actual adhesion amount of organic resin composition based on the composition of organic resin composition (polyurethane resin, acrylic resin).At this moment, through standard specimen, obtain the relation of passing through the intensity that x-ray fluorescence analysis measures in advance as the adhesion amount of the composition of object and the element corresponding with this composition.In addition, any of said element carried out quantitative analysis, not only calculate the adhesion amount of pairing composition, the cooperation that also forms with medicament according to the composite film that is coated with calculates the adhesion amount of other compositions and the adhesion amount of composite film 12.

(contained preferred component in the composite film: lubricated composition)

Composite film 12 preferably contains lubricated composition.Lubricated composition has the lubricity that improves composite film 12 as its title, improve the effect of formability.Preferably use more than wax at least a of 70～130 ℃ of fusing points specifically can give an example Tissuemat E, OPE, polypropylene wax, crystallite (マ イ Network ロ Network リ ス タ リ Application) wax as lubricated composition.At fusing point is can access lubricity more than 70 ℃, is below 130 ℃ the time at fusing point, and it is really up to the mark can not become, and can access lubricity.Preferred wax is the emulsion with emulsifying agent stable dispersion in water, and preferable particle size is 0.08～3.0 μ m.When particle diameter was lower than 0.08 μ m, the use amount of emulsifying agent increased, and therefore, corrosion resistance descends.On the other hand, when particle diameter surpasses 3.0 μ m, become big, break away from, can not obtain lubricity from this composite film 12 from composite film 12 outstanding parts.

(lubricating the mass ratio of composition: be lower than 50% more than 5%) with respect to composite film

The content of the lubricated composition in the preferred composite film 12 is with respect to the composite film of removing this lubricated composition 12 (total of the adhesion amount of the adhesion amount of the adhesion amount of zirconium composition, silicon composition, organic resin composition), and mass ratio is to be lower than 50% more than 5%.

The mass ratio of lubricated composition is lower than at 5% o'clock, is difficult to obtain lubricant effect, 50% when above, and composite film deliquescing, resistance to marring decline.

When containing lubricated composition in the composite film 12, when composite film forms the with medicament adjustment, make the with medicament of solid constituent said wax phase forms to(for) this composite film mix and get final product to become the mode of hoping mass ratio.

(the formation method of composite film)

Said composite film 12; For example can form through following mode: the liquid composite film that will contain the composition of composite film 12 given to this invention forms with medicament; Pass through rolling method; On the single face of the former material plate 11 of the aluminium of web-like or two sides continuously after the coating, make it in single baking oven or the continous way baking oven that forms by a plurality of baking ovens through toasting.If so, then can be continuously and make electronic equipment apace with precoating aluminium sheet 10, therefore on the productivity ratio this point preferably.

In addition, in described formation method, composite film 12 is liquid when being coated on the surface of the former material plate 11 of aluminium at first, the therefore protuberance on the surface of the former material plate 11 of unfertile land lining aluminium very, and on the other hand, recess preferentially obtains filling, with the recess that has been covered of heavy back very.And, through the baking processing of proceeding, can be on protuberance form the composite film 12 of hard, and can form the composite film 12 of hard with thick thickness at recess with thin thickness.

Electronic equipment is with precoating aluminium sheet 10 because have connecting airtight property and the good composite film 12 of corrosion resistance, so do not need general precoating aluminium sheet formed, be the substrate processing epithelium of representative with chromium phosphate hydrochlorate epithelium.Therefore; Can omit the operation that forms the substrate processing epithelium; With the employed medicament of the formation of substrate processing epithelium, so, make electronic equipment of the present invention and can simplify significantly with the equipment formation of precoating aluminium sheet 10; Electronic equipment is reduced cost with precoating aluminium sheet 10, and can boost productivity.

Electronic equipment of the present invention is used the precoating aluminium sheet; For connecting airtight property and corrosion resistance are further improved; Also can give earlier for what the former material plate of aluminium carried out that the chromium phosphate hydrochlorate handles representative and thisly change into processing, the substrate processing epithelium is formed between former material plate of aluminium and the composite film.When forming the substrate processing epithelium, it for example is following formation that electronic equipment of the present invention uses the precoating aluminium sheet.

Electronic equipment of the present invention is with precoating aluminium sheet 10A, and as shown in Figure 3, it constitutes: the former material plate of aluminium 11, the formed composite film of the one side at least of the former material plate 11 of this aluminium 12, between the former material plate 11 of aluminium and composite film 12 formation substrate processing epithelium 13.About former material plate 11 of aluminium and composite film 12, because identical with electronic equipment with precoating aluminium sheet 10 (with reference to Fig. 1), additional phase symbol together, and omit explanation.Below, carry out for substrate processing epithelium 13.

[substrate processing epithelium]

The formed substrate processing epithelium of general precoating aluminium sheet; Make the connecting airtight property raising of resin involucra (composite film) and the former material plate of aluminium; Also has the effect that the corrosion resistance of making improves simultaneously; Under most of situation, can use the inorganic independent epithelium or the inorganic organic composite film that contain Cr, Zr or Ti for this reason.Electronic equipment of the present invention with precoating aluminium sheet 10A in, through forming these substrate processing epitheliums, also can access same effect.As substrate processing epithelium 13, for example can enumerate chromium phosphate hydrochlorate epithelium, basic zirconium phosphate epithelium, titanium phosphate epithelium, the chromium phosphate hydrochlorate epithelium that particularly preferred 3 valency chromium are.

Electronic equipment converts with metal (Cr, Zr, Ti) with the adhesion amount of the substrate processing epithelium 13 among the precoating aluminium sheet 10A, is preferably 5mg/m ²Above 50mg/m ²Below.If converting with metal, the adhesion amount of substrate processing epithelium 13 is lower than 5mg/m ², then can not get effect of sufficient, in addition, if surpass 50mg/m ², then processability reduces.

[electronic equipment is with the electric conductivity of precoating aluminium sheet]

(resistance value: below 1 Ω)

Follow the high performance of electrical equipment in recent years, the requirement of guaranteeing for the reliability of electronic equipment raises year by year, and electric conductivity also becomes one of them.Electronic equipment of the present invention is with precoating aluminium sheet 10 (10A), and the resistance value of stating such method measurement after needing is below 1 Ω.If making said resistance value is below 1 Ω, then can be from electronic equipment with direct ground connection on the composite film 12 of precoating aluminium sheet 10.In addition, can remove electromagnetic wave noise fully.Therefore, electronic equipment is the drive unit of CD drive etc., when the such structure member of the casing of this drive unit and main frame uses electronic equipment of the present invention with precoating aluminium sheet 10, is difficult to cause write or the mistake of regenerating.In addition, electronic equipment is a liquid crystal panel, and when this liquid crystal panel fixing used electronic equipment of the present invention with precoating aluminium sheet 10 with framework and the such structure member of bonnet, picture noise was difficult to take place.

With respect to this, if resistance value surpasses 1 Ω, then direct ground connection on the composite film 12 can not fully be removed electromagnetic wave noise.

In the present invention, the arithmetic average roughness Ra on the surface through making the former material plate 11 of aluminium is in specific scope given to this invention (more than the 0.3 μ m below the 0.5 μ m), and the adhesion amount that makes composite film 12 is at specific scope (70mg/m given to this invention ²Above 700mg/m ²Below) in, the resistance value of being measured by specific method is reached below 1 Ω.Promptly; Electronic equipment of the present invention with precoating aluminium sheet 10 in; Through the former material plate 11 of aluminium for the surface of the arithmetic average roughness Ra with specific scope; Form composite film 12 with suitable uniformity, thereby become the fine protuberance form more much higher of the former material plate 11 of aluminium than the average height of composite film 12.So at the protuberance more much higher than the average height of composite film 12; The thickness of composite film 12 also rest on the application substrate processing epithelium (corrosion resistance epithelium 43 (with reference to Fig. 5)) of prior art substantially with the thickness of degree; Therefore can make resistance value below 1 Ω, can guarantee electric conductivity.

But, the arithmetic average roughness Ra on the surface of the former material plate 11 of aluminium is defined in specific scope (below the above 0.5 μ m of 0.3 μ m), and the adhesion amount of composite film 12 is defined in specific scope (70mg/m ²Above 700mg/m ²Below), this also is to be used for satisfying the necessary condition that makes resistance value reach this condition below 1 Ω, rather than adequate condition, even satisfy these conditions, still has resistance value not reach the situation below 1 Ω.For example, the arithmetic average roughness Ra on the surface of the former material plate 11 of aluminium is near lower limit, and the adhesion amount of composite film 12 is near the upper limit time, the surface of the former material plate 11 of aluminium concavo-convex little, and thickness is thick, so resistance value is difficult to reach below 1 Ω.

Therefore, in the present invention, will through after the resistance value measured of the specific method stated below 1 Ω as important document.Also have, expect that certainly resistance value is lower, be preferably below 0.5 Ω.

With reference to Fig. 2, the method for electronic equipment of the present invention with the resistance value of precoating aluminium sheet of measuring is described.This measuring method, be open the 2005-297290 communique with patent documentation 4, spy, the spy opens identical mode, the conditions of disclosed method such as 2002-206178 communique.

It is the measuring method of the resistance value among the present invention; It is to make a side the terminal 21 direct contacting electronic equipments of detector 20 with the former material plate of the aluminium of precoating aluminium sheet; With the opposing party's of detector 20 terminal 22, form the subglobose brazen spherical terminal 23 of radius 10mm via leading section, on the composite film of electronic equipment with the precoating aluminium sheet; With the load of 0.4N push and make it the contact, form some ways of contact.Also have, for the former material plate of the terminal 21 and the aluminium that make detector 20 directly contacts, electronic equipment will give with the precoating aluminium sheet and remove composite film and the former material plate of aluminium is exposed with grindings such as sand paper earlier.In addition; Because the natural oxide film on the surface of terminal 21 and spherical terminal 23 can become the reason of the measured value generation deviation that makes resistance value; So need be before the measurement of resistance value, with the surface that sand paper etc. grinds terminal 21 and spherical terminal 23, fully remove natural oxide film in advance.In addition; In order to get rid of resistance value receives the internal resistance of detector 20 when measuring influence; After preferably under the leading section state of contact of leading section that makes terminal 21 and spherical terminal 23, carrying out zero correction; Measure the resistance value of electronic equipment again, select the highest scope of detector 20 precision in the zone of this measured value, the value the when measured value that adopts detector 20 to be shown is stablized with the precoating aluminium sheet.And, in order fully to guarantee the reliability of resistance value, preferably make the measurement of this resistance value; 1 piece of electronic equipment with the precoating aluminium sheet in, measure 10 places at least in position at random, if possible; Then measure 50 places, adopt its mean value as resistance value given to this invention.

More than the electronic equipment of the present invention of explanation also can be managed with precoating aluminium sheet 10 as follows.

Electronic equipment of the present invention is with precoating aluminium sheet 10; Be to be that the electronic equipment that the single face at least of the former material plate 11 of aluminium below the 0.5 μ m more than the 0.3 μ m is formed with composite film 12 is used the precoating aluminium sheet at the arithmetic average roughness Ra on surface; Wherein, Between former material plate 11 of aluminium and composite film 12, do not form substrate processing epithelium (being equivalent to the corrosion resistance epithelium 43 among Fig. 5); Contain at least a organic resin composition, zirconium composition, the silicon composition from acrylic resin, polyurethane resin, selected, the adhesion amount of zirconium composition is converted into ZrO ₂Be 5～500mg/m ², the adhesion amount of silicon composition is converted into SiO ₂Be 2～600mg/m ², the adhesion amount of organic resin composition is 5～650mg/m ², be 70～700mg/m as the adhesion amount of composite film 12 ², making leading section is the spherical terminal 23 (with reference to Fig. 2) of radius 10mm, when pushing with the load of 0.4N for the surface that is formed with composite film 12 1 sides, the resistance value between the former material plate 11 of spherical terminal 23 and aluminium is (with reference to Fig. 1) below 1 Ω.

Also have, between former material plate 11 of aluminium and composite film 12, substrate processing epithelium 13 (with reference to Fig. 3) can be set also.

So electronic equipment of the present invention has been given play to following effect with precoating aluminium sheet 10.

(1) electronic equipment of the present invention with precoating aluminium sheet 10 in; The arithmetic average roughness Ra on the surface of the former material plate 11 of aluminium and the adhesion amount of composite film 12 are defined in specific scope; The kind and the adhesion amount of the resin of the organic resin composition that further contains in the regulation composite film 12, and each adhesion amount of zirconium composition and silicon composition.Thus; Formation has the protuberance form more much higher than the average height of composite film 12 of the fine former material plate 11 of concavo-convex aluminium; Cover application substrate processing epithelium (corrosion resistance epithelium 43 (with reference to Fig. 5)) the same degree substantially of thickness and prior art of the composite film 12 of this protuberance, can guarantee that electric conductivity, corrosion resistance and resistance to marring reach the performance more excellent than prior art.

(2) electronic equipment of the present invention is with precoating aluminium sheet 10, and it constitutes, and makes the scope of the ratio of zirconium composition and silicon composition in the inorganic constituents that contains in the composite film 12 in regulation, so the balance of resistance to marring and corrosion resistance excellence.

(3) electronic equipment of the present invention is with precoating aluminium sheet 10, and it constitutes, and makes the scope of the ratio of the inorganic constituents that contains in the composite film 12 and organic resin composition in regulation, and therefore except resistance to marring, the corrosion resistance, the balance of connecting airtight property of processing is also excellent.

(4) electronic equipment of the present invention is with precoating aluminium sheet 10, and it constitutes, and as the formation that in composite film 12, contains lubricated composition, makes the scope of the mass ratio of lubricated composition in regulation, therefore can improve formability.

(5) electronic equipment of the present invention is with precoating aluminium sheet 10A; It constitutes; Giving earlier to the former material plate 11 of aluminium, enforcement changes into processing; Between former material plate 11 of aluminium and composite film 12, form substrate processing epithelium 13, make the scope of the adhesion amount of this substrate processing epithelium 13 in regulation, so corrosion resistance and connecting airtight property of processing excellence more.

(6) electronic equipment of the present invention with precoating aluminium sheet 10 in, the adhesion amount of composite film 12 is defined in the specific scope of further qualification, each adhesion amount of organic resin composition, zirconium composition, silicon composition also is defined in the further restricted portion.Thus, except resistance to marring, corrosion resistance, the connecting airtight property of processing, can guarantee that electric conductivity reaches more excellent performance.

Electronic equipment of the present invention is with precoating aluminium sheet 10, can be applicable to the fixing casing and the structure member with the so various electronic equipments of framework and bonnet of casing and main frame, the liquid crystal panel of disc drives apparatus.

In addition, electronic equipment of the present invention is with precoating aluminium sheet 10, because have excellent lubricity; So have excellent formability; In making the operation of electronic equipment with formed products, can make the bad incidence reductionization of quality in the drawing, the yield rate of goods is improved.Thus, the present invention can reduce the cost of electronic equipment with the integral body of formed products, and consequently, the cost that goes far towards the electronic equipment goods is subdued.

[embodiment]

Next, with the embodiment that satisfies important document given to this invention with do not satisfy the important document comparative example and compare, more specifically explain with the precoating aluminium sheet for electronic equipment of the present invention.

(electronic equipment is with the making of precoating aluminium sheet)

Make the electronic equipment of embodiment 1～26 and comparative example 1～13 as follows and use the precoating aluminium sheet.

At first, will have the aluminium block fusing of composition of the A5182 of JISH4000 defined, after the adjustment alloying component, make the slab of rolling usefulness through casting.Segregation layer for steel slab surface carries out face milling, after the treatment procedures that homogenizes, through hot rolling, cold rolling and each operation of heat treatment, is made into aluminium former material plate (thickness of slab: 0.5mm, alloy species: A5182-H34).Also have, in said cold rolling final (finish to gauge) operation,, make the former material plate of aluminium with various surface roughness shown in table 1 and the table 2 (arithmetic average roughness Ra) through the surface roughness of suitable change roll.

, use the aluminium of market sale use alkalescent degreaser, carry out degreasing for the former material plate of making of aluminium, as Coating Pretreatment thereafter.Then; Shown in table 1 and table 2; As the application substrate; In embodiment 1～16,18,21～26, comparative example 1～13, carry out the chromium phosphate hydrochlorate and handle, in embodiment 19, used the substrate processing of basic zirconium phosphate (PZr), in embodiment 20, used the substrate processing of titanium phosphate (PTi).On the other hand, in embodiment 17, do not carry out usually substrate processing as the employed chromium phosphate hydrochlorate of the application substrate processing of precoating aluminium sheet etc.Also have, the metal adhesion amount of the epithelium of substrate processing shown in table 1 and the table 2 is the adhesion amount that is converted into crome metal during the chromium phosphate hydrochlorate, is the adhesion amount that is converted into metal zirconium during basic zirconium phosphate, is the adhesion amount that is converted into Titanium during titanium phosphate.

Then; Surface at the former material plate of these aluminium; Pass through rolling method; Coating weight is changed and the coating composite film forms with medicament, it is that the kind of the resin in the organic resin composition and inorganic constituents (zirconium composition, silicon composition) are allocated, and the addition that lubricates composition is changed and the medicament adjusted.Then,, form composite film with 30 seconds of 230 ℃ of heating-up temperatures baking, as the electronic equipment of embodiment 1～26 and comparative example 1～13 with the precoating aluminium sheet (below, should record and narrate thoroughly and be " embodiment 1 ", " comparative example 1 " etc.)。

Composite film forms with medicament; Adjust as follows: organic resin composition, zirconium composition, the silicon composition that will dissolve, be dispersed in resin kind in organic solvent and the water, shown in table 1 and the table 2 mix; Make it the solid component meter with separately, meet the organic resin composition in the composite film shown in table 1 and the table 2 adhesion amount, be converted into the ZrO of zirconium composition ₂Adhesion amount, be converted into the SiO of silicon composition ₂The ratio of adhesion amount, with respect to the total (solid constituent) of these compositions,, add the Tissuemat E of particle diameter 0.3 μ m as lubricated composition again to have the mode of the mass ratio shown in table 1 and the table 2.Composite film through adjustment forms with medicament, makes its solid constituent become the adhesion amount of the composite film shown in table 1 and the table 2, so controls coating weight and is coated on the former material plate of aluminium.In addition, use the precoating aluminium sheet for the electronic equipment of making, with x-ray fluorescence analysis, the absolute magnitude in the unit are of the zr element (Zr) that contains in the measurement composite film is converted into ZrO ₂, confirm adhesion amount basically identical with the zirconium composition shown in table 1 and the table 2.In addition, the ratio ([SiO of the silicon composition in the inorganic constituents ₂]/[ZrO ₂+ SiO ₂]), inorganic constituents ([ZrO ₂+ SiO ₂]) record and narrate in table 1 and table 2 for the ratio of organic resin composition.

Also have; The surface roughness of the former material plate of aluminium (arithmetic average roughness Ra) is measured through following mode: use surfagauge (little Ban Yanjiusuoshe system; サ one Off コ one ダ SE-30D); The rectangular direction of rolling direction of scanning and the former material plate of aluminium is tried to achieve arithmetic average roughness Ra (JISB0601).

Resistance value uses LCR meter (the system 4263B of HEWLETT PACKARD society) to measure as detector 20.In addition, as the spherical terminal 23 that is used to measure, use the radius of leading section to be the subglobose brazen measurement rod of forming of 10mm.At first, grind the composite film of electronic equipment, the former material plate of aluminium is exposed with the part of precoating aluminium sheet with sand paper.For the former material plate of this aluminium; As shown in Figure 2; Make a side's of detector 20 terminal 21 direct conducting contacts; Make the opposing party's of detector 20 terminal 22;, on the composite film of electronic equipment,, switch on and measured resistance value via spherical terminal 23 21,22 of terminals with the load contact measurement position of 0.4N

with the precoating aluminium sheet.Also have, when measuring, give the surface of grinding terminal 21 and spherical terminal 23 earlier with sand paper, so that the leading section state of contact of the leading section of terminal 21 and spherical terminal 23 is carried out zero correction.The position of the spherical terminal 23 in randomly changing 50 places is carried out said measurement, calculating mean value on one side on one side.

(evaluation method)

For embodiment that makes 1～26 and comparative example 1～13, the resistance to marring (processing cut) when estimating lubricity (coefficient of friction), anti-finger printing (aberration (Δ E)), bending machining, resistance to marring (packing timber cut), corrosion resistance (classification (RT NO.)) when packing timber is slided.These contents are measured as follows and are estimated.

(lubricity)

Lubricity is through バ ウ デ Application レ one ベ Application (Bowden-Leben) method (3 inches (4.7625mm) of steel ball

branch; Load 2N (200gf); Sliding speed 200mm/min); Measurement is calculated its mean value at the coefficient of friction at 3 places that each electronic equipment is selected with the surface of precoating aluminium sheet at random.

If the mean value of coefficient of friction is below 0.2, then in the common shaping processing of carrying out of various electronic equipments, there is not special problem, if can be evaluated as goodly especially 0.1 with next, so these be qualified, and are then defective above 0.2 o'clock.The mean value of coefficient of friction is presented in table 1 and the table 2.

(anti-finger printing)

Anti-finger printing is the surface of free-hand touch embodiment 1～26 and comparative example 1～13, uses コ ニ カ ミ ノ Le タ society system spectrocolorimeter (CM-600d), the aberration (Δ E) of the front and back that the measurement fingerprint adheres to.

If aberration Δ E value below 0.5, then with the naked eye almost can not confirm to be attached to the fingerprint on surface, be qualified therefore, if surpass 0.5, then with the naked eye can confirm to be attached to the fingerprint on surface, be qualified therefore.Aberration Δ E value is presented in table 1 and the table 2.

(resistance to marring (processing cut))

Resistance to marring (processing cut) is through cutting off bend test method evaluation.Promptly; Shown in Fig. 4 (a) and (b); Use the test film of metal pattern 31 and following metal pattern 32 clamping embodiment 1～26 and comparative example 1～13; Make drift 33 slide and carry out bending machining, attempt adding in shaping the reproduction of the processing cut that takes place man-hour because of punching press at the face that is formed with composite film of test film.The interval that produces between following metal pattern 32 and the drift 33 (metal pattern at interval) d, the thickness of slab of the test film that is to use has added the interval of 10% gap (clearance).

The sliding surface of the test film (with reference to Fig. 4 (c)) of bending machining has been carried out in visualization, according to state, gives following mark and quantizes, and carries out the evaluation of resistance to marring: 5 minutes: no abnormality seen fully; 4 minutes: the visible slight grinding that on composite film, recognizes reluctantly; 3 minutes: it is thus clear that tangible grinding is arranged on composite film; 2 minutes: the grinding of composite film was remarkable; 1 minute: visible had foreign matter to be stuck in the former material plate of aluminium surface; 0 minute: the situation that foreign matter is stuck in the former material plate of aluminium surface was remarkable.In electronic equipment each specification with the precoating aluminium sheet, to estimate with 5 pieces of test films, mean value is qualified more than 2, mean value is lower than 2 defective.The mean value of mark is presented in table 1 and the table 2.

(resistance to marring (packing timber cut))

Resistance to marring (packing timber cut); Packaging material as miniaturized electronics; With employed bubble fender (the bubble diameter 10mm of reality; Bubble height 4mm; Electronic component is with non-anti-electricity level) be against the face that is formed with composite film of test film; Exert pressure on one side, Yi Bian slide 50 back and forth with can the not break intensity of this degree of bubble.

Visualization makes the sliding surface of the test film that the bubble fender slides, and according to the pairing cut situation of the composite film of test film, gives following mark and makes it to quantize, and carries out the evaluation of resistance to marring: 3 minutes: do not see cut; 2 minutes: visible slight cut; 1 minute: visible significant cut.Mark qualified more than 2 minutes, mark are lower than 2 minutes defective.Count and be presented in table 1 and the table 2.

(corrosion resistance)

Corrosion resistance makes an experiment according to the neutral brine spray testing of JIS Z2371 defined, and implementation evaluation.That is, as the spray liquid to (stretch) test sample spraying that stretches, use the sodium-chloride water solution of 5 quality %, the spraying environment temperature is 35 ℃, and spray amount is with area 80cm ²Count per 1 hour 1.5 milliliters.Test period is maximum 100 hours in addition.

According to by the staging of degree quantification of corroded area rate with corrosion, the corrosion that produces for the tensile test piece that has carried out test quantizes, and classification (RTNO.) is 9.0 or more to be qualified, classification be lower than 9.0 defective.Classification display is in table 1 and table 2.

[table 1]

[table 2]

(result)

According to the content shown in table 1 and the table 2, can know following result.

(influence of the surface roughness of the former material plate of aluminium (arithmetic average roughness Ra))

Comparative example 1, arithmetic average roughness Ra are lower than the lower limit of the scope of the present invention regulation, and the adhesion amount of composite film is the higher limit of the scope stipulated of the present invention in addition, therefore can not satisfy important document given to this invention about resistance value.In addition; Comparative example 2; Arithmetic average roughness Ra surpasses the higher limit of the present invention's restriction, and the adhesion amount of composite film is the lower limit of the scope of the present invention's regulation in addition, therefore becomes the result that lubricity, anti-finger printing, resistance to marring (processing cut) and corrosion resistance do not satisfy criterion of acceptability.

(influence of the adhesion amount of composite film)

Comparative example 3, the adhesion amount of composite film surpass the higher limit of the scope of the present invention's regulation, therefore can not satisfy the important document of the present invention's regulation about resistance value.In addition, comparative example 4 is because the adhesion amount of composite film is lower than the lower limit of scope given to this invention, so become the result that anti-finger printing, resistance to marring (packing timber cut) and corrosion resistance do not satisfy criterion of acceptability.

(influence of the adhesion amount of organic resin composition)

Comparative example 5, the adhesion amount of the organic resin composition that composite film is contained are lower than the lower limit of the scope of (not reaching) the present invention regulation, and therefore the reduction of connecting airtight property of processing becomes lubricity and do not satisfy the criterion of acceptability result.In addition, comparative example 8, the adhesion amount of the organic resin composition that composite film is contained surpass the higher limit of the scope of the present invention's regulation, therefore can not satisfy important document given to this invention about resistance value.

(influence of the adhesion amount of zirconium composition)

Comparative example 6 is because the adhesion amount of the contained zirconium composition of composite film is lower than the lower limit of the scope of (not reaching) the present invention regulation, so become the result that corrosion resistance does not satisfy criterion of acceptability.In addition, comparative example 9 is because the adhesion amount of the contained zirconium composition of composite film surpasses the higher limit of the scope of the present invention's regulation, so the reduction of connecting airtight property of processing becomes the result that lubricity satisfies criterion of acceptability.

(influence of the adhesion amount of silicon composition)

Comparative example 7, the adhesion amount of the silicon composition that composite film is contained are lower than the lower limit of the scope of (not reaching) the present invention regulation, therefore become the result that resistance to marring (packing timber cut) does not satisfy criterion of acceptability.In addition, comparative example 10 is because the adhesion amount of the contained silicon composition of composite film surpasses the higher limit of the scope of the present invention's regulation, so the reduction of connecting airtight property of processing becomes the result that lubricity does not satisfy criterion of acceptability.

(influence of the organic resin composition of composite film)

As the organic resin composition, comparative example 12 is because only use mylar, and 13 of comparative examples use epoxy resin, so all form the result that resistance to marring (packing timber cut) does not satisfy criterion of acceptability.

On the other hand; At the surface roughness (arithmetic average roughness Ra) of the former material plate of aluminium, adhesion amount and composition (kind of the resin of organic resin composition and the adhesion amount of composite film; Each adhesion amount of zirconium composition and silicon composition) all satisfies among the embodiment 1～26 of scope of the present invention regulation; Resistance value also satisfies the scope of the present invention's regulation, is electric conductivity, lubricity, anti-finger printing, resistance to marring (processing cut, packing timber cut) and the no problem all result of corrosion resistance.

In addition about the component ratio of composite film, with the embodiment 1 that satisfies the invention request 2 of the present invention that except the adhesion amount of the inorganic constituents of composite film, is same specification with do not satisfy invention and ask 2 embodiment 21,22 to compare.Consequently, the side of embodiment 1, the embodiment 21 few with the zirconium component ratio compares; Resistance to marring (packing timber cut) and excellent corrosion resistance, the embodiment 22 few with the silicon component ratio compares, resistance to marring (processing cut; The packing timber cut) excellence can know that whole balance of properties is excellent.Equally; Compare with the embodiment 8 that does not satisfy invention request 2 if will satisfy the embodiment 4 of invention request 2 of the present invention, the side of embodiment 4 then, the embodiment 8 few with the silicon component ratio compares; Resistance to marring (processing cut) excellence can know that the complete characteristic balance is excellent.

In addition, about the component ratio of composite film, with satisfy except the adhesion amount of the organic resin composition of composite film be basically same specification invention request 3 of the present invention embodiment 1 and do not satisfy to invent and ask 3 embodiment 23,24 to compare.Consequently, the side of embodiment 1, the embodiment 23 few with the inorganic constituents ratio compares; Resistance to marring (packing timber cut) excellence; The embodiment 24 few with the organic resin component ratio compares, and lubricity and resistance to marring (processing cut) excellence can know that whole balance of properties is excellent.Equally, ask 3 embodiment 9,11 to compare if will satisfy the embodiment 5 and the satisfied invention of invention request 3 of the present invention; The side of embodiment 5 then; The embodiment 9 few with the inorganic constituents ratio compares, electric conductivity (resistance value) excellence, and the embodiment 11 few with the organic resin component ratio compares; Lubricity is excellent, can know that whole balance of properties is excellent.

In addition, at the lubricated composition that contains, be the embodiment 1,3 of the invention request 4 of the present invention of same specification about composite film with satisfying except the mass ratio of the lubricated composition of composite film, ask 4 embodiment 25,26 to compare with not satisfying to invent respectively.Consequently, the side of embodiment 1 compares with the embodiment 25 that does not contain lubricated composition; Lubricity and resistance to marring (processing cut) excellence; The side of embodiment 3 is contained lubricated composition with surplus, and composite film generation thick filmization, softening embodiment 26 compare; Electric conductivity (resistance value) and excellent corrosion resistance can know that whole balance of properties is excellent.

In addition, about the substrate processing epithelium,, compare with the embodiment 17,18 that satisfies invention request 5 with the embodiment that satisfies invention request 5 of the present invention 1,19,20.Consequently; The side of embodiment 1,19,20; Compare with the embodiment that does not form the substrate processing epithelium 17, excellent corrosion resistance is compared with the embodiment 18 of superfluous ground chromium phosphate hydrochlorate epithelium; Lubricity, anti-finger printing, resistance to marring (processing cut) excellence can know that whole balance of properties is excellent.Be formed with the embodiment 1 of chromium phosphate hydrochlorate epithelium in addition as the substrate processing epithelium, compare, can know that corrosion resistance is the most excellent with the embodiment that changing into the processing epithelium 19,20 that forms beyond the chromium phosphate hydrochlorate epithelium.Also have; Even the substrate processing epithelium is not set as embodiment 17; Satisfy scope given to this invention through the surface roughness of the former material plate of aluminium and the adhesion amount and the composition of composite film, the characteristic good electron equipment that still can become corrosion resistance etc. is used the precoating aluminium sheet, according to the degree of desired characteristic; On the point of cost degradation and productivity ratio raising, we can say that its constituent ratio embodiment 1 grade is more excellent.

In addition; With the embodiment that satisfies invention request 6 of the present invention 1,15,13, embodiment 5,16 and the comparative example 11 with the invention request 6 of discontented unabridged version invention compares respectively, and its result can know; The top resistance value of embodiment 1,15,13 is low, excellent electric conductivity.

Also have; About comparative example 11; Although the adhesion amount of the surface roughness of the former material plate of aluminium (arithmetic average roughness Ra), composite film and composition (kind of organic resin composition and adhesion amount; Each adhesion amount of zirconium composition and silicon composition) all satisfies scope given to this invention, but have only the important document of the discontented unabridged version invention of resistance value.This is considered to because the adhesion amount of composite film is a higher limit, thereby has caused this result.Therefore, even the former material plate of aluminium, its various parameters separately of composite film of the present invention's regulation are guaranteeing on the electric conductivity it is necessary condition, can not say to be exactly adequate condition.Therefore; Electronic equipment of the present invention with the precoating aluminium sheet in; In order positively to have given play to desirable effect, i.e. the effect of electric conductivity, lubricity, anti-finger printing, resistance to marring (processing cut, packing timber cut) and excellent corrosion resistance; Just need regulation, the resistance value of measuring through specific method is below 1 Ω.

More than; Detailed explanation through invention; Be illustrated with the precoating aluminium sheet for electronic equipment of the present invention; But aim of the present invention is not limited by said content, the change that in scope, can suit based on the thought of technology of the present invention, and such scope also should be interpreted as in the thought that is included in technology of the present invention certainly.

Claims (6)

1. an electronic equipment is used the precoating aluminium sheet, it is characterized in that, the composite film that contains inorganic constituents and organic resin composition that has the former material plate of aluminium and on the single face at least of the former material plate of said aluminium, form; And; To the surface of the side that is formed with said composite film, push the bulbous end period of the day from 11 p.m. to 1 a.m that leading section is radius 10mm with the load of 0.4N, the resistance value between the former material plate of said spherical terminal and said aluminium is below 1 Ω; Wherein

In the former material plate of said aluminium, the arithmetic average roughness Ra that is formed with the surface of said composite film one side is below the above 0.5 μ m of 0.3 μ m,

In said composite film, contain zirconium composition and silicon composition as said inorganic constituents, contain at least a in polyurethane resin and the acrylic resin as said organic resin composition, said zirconium composition is converted into ZrO ₂Adhesion amount be 5～500mg/m ², said silicon composition conversion SiO ₂Adhesion amount be 2～600mg/m ², the adhesion amount of said organic resin composition is 5～650mg/m ², wherein, the adhesion amount of the adhesion amount of said zirconium composition, said silicon composition and the adhesion amount of said organic resin composition add up to 70～700mg/m ²

2. electronic equipment according to claim 1 is used the precoating aluminium sheet, it is characterized in that, in said composite film, said silicon composition is with respect to being converted into ZrO ₂Said zirconium composition be converted into SiO ₂The mass ratio [SiO of total of said silicon composition ₂]/[ZrO ₂+ SiO ₂] be more than 0.2 below 0.95.

3. electronic equipment according to claim 1 and 2 is used the precoating aluminium sheet, it is characterized in that, in said composite film, is converted into ZrO ₂Said zirconium composition be converted into SiO ₂The quality of said silicon composition to add up to be more than 0.2 times below 10 times of quality of said organic resin composition.

4. electronic equipment according to claim 1 is used the precoating aluminium sheet, it is characterized in that, in said composite film, also to contain with respect to this composite film mass ratio be more than 5% but be lower than 50% lubricated composition.

5. electronic equipment according to claim 1 is used the precoating aluminium sheet; It is characterized in that; Between former material plate of said aluminium and said composite film; Also be formed with the substrate processing epithelium that is made up of inorganic independent epithelium that contains the metal of from chromium, zirconium, titanium, selecting or inorganic organic composite film, the adhesion amount of said substrate processing epithelium is scaled 5mg/m with said metal ²Above 50mg/m ²Below.

6. electronic equipment according to claim 1 is used the precoating aluminium sheet, it is characterized in that, in said composite film, said zirconium composition is converted into ZrO ₂Adhesion amount be 5～250mg/m ², said silicon composition is converted into SiO ₂Adhesion amount be 2～300mg/m ², the adhesion amount of said organic resin composition is 5～325mg/m ², wherein, the adhesion amount of the adhesion amount of said zirconium composition, said silicon composition and the adhesion amount of said organic resin composition add up to 70～350mg/m ²,

Load with 0.4N is the bulbous end period of the day from 11 p.m. to 1 a.m of radius 10mm to the pressed leading section that is formed with said composite film one side, and the resistance value between the former material plate of said spherical terminal and said aluminium is below 0.5 Ω.

Images