CN106521268A - Aluminum alloy for consumer electronic product shell and preparing method and application of aluminum alloy - Google Patents

Aluminum alloy for consumer electronic product shell and preparing method and application of aluminum alloy Download PDF

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Publication number
CN106521268A
CN106521268A CN201611270251.7A CN201611270251A CN106521268A CN 106521268 A CN106521268 A CN 106521268A CN 201611270251 A CN201611270251 A CN 201611270251A CN 106521268 A CN106521268 A CN 106521268A
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China
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alloy
aluminum
consumer electronics
shell
aluminium
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CN201611270251.7A
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Chinese (zh)
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CN106521268B (en
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李清
李建湘
丁小理
刘经发
周旺
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中山瑞泰铝业有限公司
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making alloys
    • C22C1/02—Making alloys by melting
    • C22C1/026—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making alloys
    • C22C1/02—Making alloys by melting
    • C22C1/03—Making alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making alloys
    • C22C1/06—Making alloys with the use of special agents for refining or deoxidising
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/047—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent

Abstract

The invention discloses an aluminum alloy for a consumer electronic product shell and a preparing method and application of the aluminum alloy. The aluminum alloy for the consumer electronic product shell comprises, by mass percent, 0.38%-0.48% of Si, 0.55%-0.70% of Mg, smaller than or equal to 0.12% of Fe, smaller than or equal to 0.03% of Mn, smaller than or equal to 0.03% of Cr, 0.10%-0.30% of Cu, smaller than or equal to 0.03% of Zn, smaller than or equal to 0.10% of Ti, smaller than 0.15% of other impuritiesand the balance Al, wherein Mn+Cr<=0.05%, and Si<=Mg/1.732+0.08%. The alloy has high hardness and good mechanical performance after being subjected to T6 treatment, an extrusion base material metallographic structure is a single perfect recrystallization fine grain structure, good anodic oxidation resisting performance is achieved, and the aluminum alloy is suitable for being used for manufacturing the consumer electronic product shell.

Description

A kind of consumer electronics shell aluminium alloy and its preparation method and application

Technical field

The invention belongs to aluminum alloy materials and its manufacture field, more particularly to a kind of consumer electronics shell aluminium alloy and Its preparation method and application.

Background technology

With intelligent mobile phone, the extensive application of panel computer, consumer to high-end consumer electronics except possess function will Ask outer, more and more higher is required to outward appearance/texture.Al-alloy metal structural member has become one of consumer electronics shell standard configuration.

In the market, the shell of consumer electronics have die cast, Strip can directly punch forming, extrude base material The various ways such as CNC machine-shapings.Wherein die cast product machining amount is big, and compression casting waste material is oxidizable and impurity content Many, forming process easily produces many defects, improves the production cost of product.And the direct punch forming of Strip is adopted because of strip , there is obvious incomplete recrystallized tissue, a large amount of strain lines after anodic oxidation, occur, affect outward appearance in the stretching of material aximal deformation value Effect.Only the consumer electronics shell of minority Low Tier Brand is being used at present.It is in the enclosure designs of high-end product integration, many Using the extrusion plate of thickness (>=6mm), after CNC processing, anodized is obtained.

Accordingly, it would be desirable to select suitable al alloy component and meet high-end electronic appearance member using rational preparation method The requirement on high surface.Have to solve three key issues：The intensity requirement in the service life cycle must fully be met；Surface Allow for reaching decorative effect requirement after anodic oxidation, without the not first-class defect of surface chromatic aberration gloss after material stricture of vagina, black line, oxidation； CNC and injection molding anteroposterior dimension and dimensionally stable.

In prior art, National Standard of the People's Republic of China GB/T3190-2008 is generally adopted《Deformation aluminum and aluminium alloy Chemical composition》Specified in the trade mark 6063 aluminium alloy extruding consumer electronics shell aluminium section bar.By mass fraction percentage Than meter, the aluminium alloy standard of the trade mark 6063：Mg：0.45～0.90%；Cu：0.10%；Si：0.20～0.60%；Zn： 0.10%；Mn：0.10%；Fe：0.35%；Cr：0.10%；Ti：0.10%；Balance of Al.Due to GB wider range, performance It is widely different.When Si, Mg lower bound, mechanical property is all relatively low, specially tensile strength (MPa) >=210Mpa；Yield strength (MPa)≥180Mpa；Elongation percentage (%) >=10%；Vickers hardness (HV) >=65；When Si, Mg height is prescribed a time limit, mechanical property is higher, tool Body is：Tensile strength (MPa) >=270Mpa；Yield strength (MPa) >=230Mpa；Elongation percentage (%) >=80%；Vickers hardness (HV) >=90, but after client CNC processing, anodized lines on surface is high substantially, it is impossible to meet customer need.

The content of the invention

The primary and foremost purpose of the present invention is the shortcoming and deficiency for overcoming prior art, there is provided a kind of consumer electronics shell is used Aluminium alloy.

Another object of the present invention is to provide the preparation method of the consumer electronics shell aluminium alloy.

A further object of the present invention is to provide the application of the consumer electronics shell aluminium alloy.

The purpose of the present invention is achieved through the following technical solutions：A kind of consumer electronics shell aluminium alloy, comprising following Component by mass percentage：Si be 0.38～0.48%, Mg be 0.55～0.70%, Fe≤0.12%, Mn≤0.03%, Cr≤0.03%, Cu are 0.10～0.30%, Zn≤0.03%, and Ti≤0.10%, other impurities total amount ＜ 0.15% are balance of Al；Wherein, Mn+Cr≤0.05%, (i.e. surplus Si total amounts (mass percent) control exists Si≤Mg/1.732+0.08% Within 0.08%).

Described consumer electronics shell aluminium alloy preferably comprises following component by mass percentage：Si is 0.43 ～0.46%, Mg be 0.62～0.68%, Fe≤0.11%, Mn≤0.02%, Cr≤0.03%, Cu be 0.20～0.28%, Zn≤0.01%, Ti≤0.10%, other impurities total amount ＜ 0.15%, balance of Al, wherein, Si≤Mg/1.732+0.08%.

A kind of preparation method of consumer electronics shell aluminium alloy, comprises the steps：

(1) got the raw materials ready according to above-mentioned mass percent, wherein, aluminum and magnesium adopt aluminium ingot and magnesium ingot；

(2) aluminium ingot is loaded into smelting furnace, is heated to 730～760 DEG C and is melted, adding magnesium ingot and intermediate alloy is carried out Alloying, obtains aluminum melt A；

(3) refining agent is added in aluminum melt A, carry out refine in 730～750 DEG C, while refine in aluminum melt A It is passed through refinery gas to be stirred, aerofluxuss, skim, obtains aluminum melt B；

(4) melt B is stood, obtains aluminum melt C；

(5) aluminum melt C is cast, casting temperature is controlled at 680～710 DEG C, is obtained alloy circle ingot casting；

(6) alloy for obtaining circle ingot casting is heated to 7 hours being incubated after 565 ± 5 DEG C, then is cooled to by force room temperature with water smoke, obtain To consumer electronics shell aluminium alloy.

Intermediate alloy described in step (2) is preferably AlSi12 and AlCu40.

Smelting furnace described in step (2) is preferably heat storing type energy-saving stove.

The temperature of the fusing described in step (2) is preferably 750 DEG C.

The addition of the refining agent described in step (3) presses 2kg/ ton aluminum melts A calculating.

The temperature for carrying out refine described in step (3) is preferably 740 DEG C, the preferably 40 minutes time of refine.

Refinery gas described in step (3) are preferably high-purity argon gas.

The pressure of described argon is 0.05～0.1Mpa, and flow is 12L/ minutes.

Described in step (3) obtain aluminum melt B also include trimming the step of：By the aluminum melt Bization for obtaining Component analyses are learned, if alloying component is not in the range of described in step (1), by trimming, by alloying component control In the scope described in step (1).

The aluminum melt C that obtains described in step (4) also includes the step of purifying.

Aluminum melt C is passed sequentially through depassing unit preferably for described purification and double-stage filtering system is purified.

Described depassing unit is preferably box depassing unit.

Described double-stage filtering system is preferably 80 mesh foamed ceramic filter plates and RC tubular filters.

The time of the standing described in step (4) is 25～40 minutes, preferably 40 minutes.

The method of the casting described in step (5) is preferably semicontinuous water cooling casting method.

The temperature of the casting described in step (5) is preferably 685～710 DEG C.

Heating described in step (6) is carried out in homogenization heat-treatment furnace.

Application of the described consumer electronics shell aluminium alloy in consumer electronics shell aluminum alloy base material is prepared.

A kind of consumer electronics shell aluminum alloy base material, comprises the following steps：

1. above-mentioned consumer electronics shell is loaded with aluminium alloy and is heated in aluminium bar pot arch；

2. the aluminium alloy after heating is loaded extruder again to be extruded；

3. press quenching is carried out after extruding, obtain aluminum alloy materials；

4. aluminum alloy materials are carried out into tension straingtening；

5. carry out artificial aging technique.

Step 1. described in consumer electronics shell with aluminium alloy also include sawing the step of, alloy is sawed into properly Length, preferably 635～740mm.

Step 1. described in aluminium bar pot arch be preferably three area's heating modes aluminium bar pot arch, an area (entrance preheat Area) temperature be 500～530 DEG C, 2nd area (moderate soak area) temperature be 540～560 DEG C, 3rd area (outlet area) temperature be 500～ 560℃；Described aluminium bar pot arch can also use four area Shi Huo, five area's formulas, and wherein, entrance preheating zone temperature is 500～530 DEG C, Outlet area temperature is 500～560 DEG C, and interlude is heat preservation zone, and temperature setting is 540～560 DEG C.

The temperature of described entrance preheating zone is preferably 500 DEG C.

The temperature in described moderate soak area is preferably 550 DEG C.

The temperature of described outlet area is preferably 530～550 DEG C.

Step 1. described in heating time be preferably 2～5 hours.

Step 2. described in extruding temperature be 500～560 DEG C；The speed (master cylinder pace) of extruding be 1.5～ 3.0mm/s, preferably 2.0～3.0mm/s；Extrusion ratio (extrusion coefficient λ) is more than 50, preferably 53～66.

Step 3. described in the method for press quenching be preferably achieved by the steps of：Pass through water temperature in 15S 10 ～50 DEG C of tank.

Step 3. described in press quenching cooldown rate be preferably 40 DEG C/s.

Step 4. described in stretching stretched preferably with stretching-machine, simultaneously removal material is residual to realize material aligning Residue stress.

Step 4. described in the amount of tension for carrying out tension straingtening be preferably 1～3%.

Step 5. described in the condition of artificial aging technique be：170 ± 5 DEG C are incubated 10 hours.

A kind of consumer electronics shell, including the metal-back made of aluminum alloy base material with described consumer electronics shell Body.

For improving alloy underlying strength, it is necessary to properly increase alloy strengthening phase Mg2Si contents, the present invention in Si be 0.38～ 0.48%, Mg are 0.55～0.70%, Mg2The control of Si contents is between 0.87～1.10%；Cu elements have solid solution strengthening effect, Its content 0.10～0.30% is controlled in the present invention, to guarantee that alloy T6 can obtain more than HV100 hardness after processing, meanwhile, it is The characteristics of keeping oxide-film penetrating limpid, the content of strict control impurity.The current potential (- 0.76V) of Zn compared with Al current potential (- 1.67V) just, the larger corrosion current caused in micro cell of the potential difference of the two is very big, and oxide-film is susceptible to dot etching, therefore Its content must be controlled less than 0.03%.Fe can improve alloy recrystallization temperature, be conducive to generating fibrous crystal tissue during hot-working； Meanwhile, phase containing Fe forms liquid solution at a temperature of aluminium alloy smelting, and solid solubility very little under room temperature, mainly with insoluble or indissoluble In the form of the brittlement phases such as AlFeMnSi and cocrystalization compound.It is anti-that Copper component granule belongs to negative electrode in follow-up anodic attack process Should, can be etched around its granule and make which drop, form about 2～10 μm of size etch pits, diffuse-reflectance occurs under light illumination, Visually compared with mist and secretly, therefore its content must be controlled less than 0.12%.While Mn, Cr elements can be in high-temperature heating process precipitation shape Into MnAk6 CrAl7 compounds, hinder Recrystallization nucleation and to grow up, promote fibrous crystal to be formed.And fibrous crystal anodized Products appearance has obvious lines sense afterwards, has a strong impact on visual effect.Si in alloy except with Mg with 1.732：1 ratio Formed reinforceing phase Mg2Si outside, if surplus just defines free Si, Al-Fe-Si phase, these particles easily in grain boundaries segregation, in corruption Under erosion medium, constitute in spot corrosion source the design, management and control surplus Si≤0.08%.

In order to obtain uniform penetrating limpid anode surface quality, after squeeze wood processed (CNC, grinding, sandblasting), top layer Tissue grain size is uniform, by ASTM E112 standards, controls grain size 4-5 level.For improving processing procedure yields, aluminium alloy is controlled Total Slag inclusion content PoDFA of ingot casting is less than 0.12mm2/ Kg, and surface heat peeling process is carried out after extruding ingot casting heating, remove casting Ingot surface segregation layer.

The present invention is had the following advantages relative to prior art and effect：

1st, the alloying component in institute's how of the present invention is selected, by manufacture method proposed by the present invention, resulting materials totality It is characterized as：Squeeze wood Jing T6 process after, hardness up to HV100-115, more than more than the 20% of the HV80-90 of common 6063-T6； In extruding ingot material, Slag inclusion overall control PoDFA is less than 0.12mm2/ Kg, oxide-film number are controlled in 10Max/kg；Squeeze Pressure material metallographic structure is single perfect recrystallization fine grained texture, and grain size is more than 3 grades；Do not exist after anodic oxidation material stricture of vagina, The not first-class defect of surface chromatic aberration gloss after black line, oxidation.

Description of the drawings

Fig. 1 is the process chart of consumer electronics shell aluminium alloy of the present invention.

Specific embodiment

With reference to embodiment, the present invention is described in further detail, but embodiments of the present invention not limited to this.

Embodiment 1

Raw material

Aluminium ingot：Adopt the trade mark for Al99.7 aluminium ingot, in aluminium ingot the mass percent of Al for more than 99.70%, Fe matter Amount percentage ratio within 0.08%, conformance with standard GB/T 1196-2008《Remelting aluminium ingot》；

Magnesium ingot：Adopt the trade mark for Mg9990 magnesium ingot, in magnesium ingot the mass percent of Mg be more than 99.9%, conformance with standard GB/T 3499-2003《Primary magnesium ingot》；

Alloy addition (aluminum silicon)：Using AlSi12 intermediate alloys, quality meets YS/T282-2000 standards；

Aluminum bronze：Using AlCu40 intermediate alloys, quality meets YS/T282-2000 standards；

Refining agent：The trade mark is adopted for the granular refining agents of PROMAG RI, conformance with standard YS/T491-2005《Deformation aluminum and aluminum Alloy flux》；

Refinery gas：Using high-purity argon gas, it is >=99.999% that purity is percentage by volume；

Melting online treatment gas：Using high-purity argon gas, it is >=99.999% that purity is percentage by volume；

Intensification smelting is carried out during raw material to be put into heat storing type energy-saving stove in order, fuel adopts natural gas, its technique stream Journey is as shown in figure 1, comprise the following steps that：

1st, the manufacture method of aluminium alloy round cast ingot：

(1) raw material prepares：Determine each composition by mass percentage：It is that 0.62%, Fe is that Si is 0.43%, Mg 0.10%, Mn be 0.01%, Cu be 0.20%, Cr be 0.01%, Zn be 0.01%, Ti≤0.10%, balance of Al carries out standby Material；

(2) shove charge：Aluminium ingot in above-mentioned raw materials is loaded into smelting furnace (heat storing type energy-saving stove)；

(3) heating fusing：In-furnace temperature is controlled at 750 DEG C, makes aluminium ingot be completely melt to become aluminum melt I；

(4) alloying：Above-mentioned magnesium ingot and intermediate alloy is added in aluminum melt I, and stirring melts which, and melt is carried out Preliminary alloying, obtains aluminum melt II；

(5) refine：Add refining agent in the aluminum melt II that step (4) is obtained, consumption is 2kg/ ton aluminum melt II, refine Temperature be 740 DEG C, refining time be 40 minutes, the aluminum melt for obtaining is carried out chemical composition analysis by refining process, if alloy into Divide not in the scope described in step (1), then by trimming, alloying component is controlled in the scope described in step (1)； While refine by furnace bottom air brick be passed through in aluminum melt high-purity argon gas be stirred, aerofluxuss, then skim, obtain aluminum melt Body III, wherein, argon pressure is controlled in 0.05～0.1MPa, and flow-control is in 12L/ minutes；

(6) alloy component analysis：Melt III to obtaining after step (5) refine carries out alloying element analysis, alloying component Not in the scope described in step (1), then by trimming, alloying component is controlled in the scope described in step (1)；

(7) stewing process：Aluminum melt III is stood into 40 minutes, aluminum melt IV is obtained；

(8) online degasification：Dehydrogenation is carried out using depassing unit, aluminum melt IV hydrogen contents are controlled in 0.15ml/100g.Al Below aluminum；

(9) on-line filtration：Purified using double-stage filtering system, i.e., using 80 mesh foamed ceramic filter plates and RC tubular types Filter is filtered；

(10) cast：Using semicontinuous water cooling casting method, casting temperature is controlled at 685～710 DEG C, and casting obtains aluminium alloy Circle ingot casting；

(11) Homogenization Treatments：565 ± 5 DEG C are heated up in homogenization heat-treatment furnace is incubated 7 hours, it is then fast with water smoke Speed is cooled to room temperature, obtains consumer electronics shell aluminium alloy round cast ingot.

2nd, aluminium extrusion profile material manufacture method：

(1) aluminium alloy round cast ingot obtained above (aluminium bar) is cut into into 635mm length, is heated using aluminium bar pot arch at a slow speed, 500 DEG C of one area (entrance preheating zone) temperature, 550 DEG C of 2nd area (moderate soak area) temperature, 540 DEG C of 3rd area (outlet area) temperature, plus Warm 2 hours (from the inlet to the outlet)；

(2) aluminium alloy round cast ingot loading extruder is extruded, design aluminium alloy round cast ingot enters extruder ingot-containing tube Front temperature is 510～520 DEG C, extrusion ratio (extrusion coefficient：The cross sectional area of extruding barrel chamber is with the total cross sectional area of extruded product Ratio) be 53, extrusion speed (master cylinder pace) be 2.0mm/s, extruding outlet temperature be 500～550 DEG C；

(3) alloy product from die orifice out after, by water temperature in 10～50 DEG C of tank in the 15S, rate of cooling reaches 40 DEG C/more than S, alloy material is made to realize press quenching；

(4) stretcher strain amount：Alloy material is stretched using stretching-machine, amount of tension is controlled 1～3%, is wherein squeezed Go out the head 1.0% of workpiece, extrude the afterbody 1.7% of workpiece, material aligning is realized while removing material residual stress；

(5) artificial aging technique：Aging temp is 170 DEG C, aging time 10 hours.

Embodiment 2

1st, aluminum circle ingot casting manufacture method：

According to Al-Mg-Si alloy (consumer electronics shell aluminium alloy) chemical analysis by mass percentage：For Si For 0.46%, Mg be 0.68%, Fe be 0.11%, Mn be 0.02%, Cr be 0.02%, Cu be 0.28%, Zn be 0.01%, Ti ≤ 0.10%, balance of Al is got the raw materials ready, and obtains aluminium alloy round cast ingot according to technique productions same as Example 1.

2nd, aluminium extrusion profile material manufacture method：

(1) above-mentioned aluminum circle ingot casting (aluminium bar) is cut into into 740mm length, is heated using aluminium bar pot arch at a slow speed, area's temperature 500 DEG C, two 550 DEG C of area's temperature, three 550 DEG C of area's temperature heat 5 hours (from the inlet to the outlet)；

(2) aluminium alloy round cast ingot loading extruder is extruded, design aluminium alloy round cast ingot enters extruder ingot-containing tube Front temperature is 510～520 DEG C, and extrusion ratio is 66, and extrusion speed (master cylinder pace) is 3.0mm/s, extrudes outlet temperature and is 500～560 DEG C；

(3) alloy product from die orifice out after, by water temperature in 10～50 DEG C of tank in the 15S, rate of cooling is 40 DEG C/S, make alloy material realize press quenching；

(4) stretcher strain amount：Material is stretched using stretching-machine, amount of tension is controlled 1～3%, wherein extrudes work The head 1.4% of part, extrudes the afterbody 2.6% of workpiece, realizes material aligning while removing material residual stress；

(5) artificial aging technique：Aging temp is 170 DEG C, aging time 10 hours.

Embodiment 3

1st, aluminum circle ingot casting manufacture method：

According to Al-Mg-Si alloy chemical analysis by mass percentage：It is that 0.64%, Fe is that Si is 0.43%, Mg 0.09%, Mn be 0.01%, Cr be 0.03%, Cu be 0.25%, Zn be 0.004%, Ti≤0.10%, balance of Al carries out standby Material, obtains aluminium alloy round cast ingot according to technique productions same as Example 1.

2nd, aluminium extrusion profile material manufacture method：

(1) above-mentioned aluminum circle ingot casting (aluminium bar) is cut into into 700mm length, is heated using aluminium bar pot arch at a slow speed, area's temperature 500 DEG C, two 550 DEG C of area's temperature, three 530 DEG C of area's temperature heat 4 hours (from the inlet to the outlet)；

(2) aluminium alloy round cast ingot loading extruder is extruded, design aluminium alloy round cast ingot enters extruder ingot-containing tube Front temperature is 520～530 DEG C, and extrusion ratio is 55, and extrusion speed (master cylinder pace) is 2.0mm/s, extrudes outlet temperature and is 510～545 DEG C；

(3) product from die orifice out after, by water temperature in 10～50 DEG C of tank in the 15S, rate of cooling is 40 DEG C/S, Material is made to realize press quenching；

(4) stretcher strain amount：Material is stretched using stretching-machine, amount of tension is controlled 1～3%, wherein extrudes work The head 1.5% of part, extrudes the afterbody 2.9% of workpiece, realizes material aligning while removing material residual stress；

(5) artificial aging technique：Aging temp is 170 DEG C, aging time 10 hours.

Comparative example 1

1st, aluminum circle ingot casting manufacture method：

According to Al-Mg-Si alloy chemical analysis by mass percentage：It is that 0.48%, Fe is that Si is 0.38%, Mg 0.15%, Mn be 0.05%, Cr be 0.08%, Cu be 0.08%, Zn be 0.04%, Ti≤0.10%, balance of Al carries out standby Material, obtains aluminium alloy round cast ingot according to technique productions same as Example 1.

2nd, aluminium extrusion profile material is obtained by 1 identical technique productions of embodiment.

Comparative example 2

1st, aluminum circle ingot casting manufacture method：

According to Al-Mg-Si alloy chemical analysis by mass percentage：It is that 0.72%, Fe is that Si is 0.45%, Mg 0.18%, Mn be 0.02%, Cr be 0.02%, Cu be 0.03%, Zn be 0.01%, Ti≤0.10%, balance of Al carries out standby Material, obtains aluminium alloy round cast ingot according to technique productions same as Example 1.

2nd, aluminium extrusion profile material is obtained by 1 identical technique productions of embodiment.

Effect example

Consumer electronics shell obtained in embodiment 1～3 is obtained with aluminium alloy extruded profile material and comparative example 1～2 Obtaining aluminium extrusion profile material carries out following detection, and condition of heat treatment is T6：

1st, according to GB/T 228.1-2010《Metal material stretching test part 1：Room temperature test method》Product is carried out Mechanics Performance Testing；

2nd, according to GB/T 4340.1-2009《Vickers Hardness Test of Metallic Materials part 1：Test method》Product is entered Row vickers hardness test.

3rd, by GB/T 20503-2006《Aluminum and aluminium alloy anode oxide anode oxide film specular reflectivity and bright luster 20 ° of the measure of degree, 45 °, 60 °, 85 ° of angle directions》60 ° of mirror surface luster measure is carried out to product.

The performance test results of above-mentioned five kinds of different aluminum alloys are as shown in table 1；Wherein, the measure of surface gloss is by identical CNC Lathe quantities, sandblasting, anodic oxidation condition.

1 different-alloy the performance test results of table

Note：R in tablemRepresent tensile strength (σb/Mpa)；Rp0.2Represent yield strength (σ0.2/Mpa)；A50mmExpression is had no progeny and is prolonged Stretch rate (A50/ %).

The inventive method prepare aluminium alloy cross T6 process after hardness up to HV105-113, it is limpid penetrating after anodic oxidation, Without material stricture of vagina；It is processed into phone housing, in the phone housing of batch making, without material stricture of vagina, the lacuna such as piebaldism, black line, meet high-end The requirement on the high surface of electronic appearance part.

In comparative example 1, Mg2It is 0.08% that Si is 0.757%, Cu, and alloy hardness after T6 process is HV65-69, firmly Degree is low.Fe is 0.15%, and superfluous Si is 0.103%, as phase containing Fe drops to form etch pit in anodic oxidation corrosion process, Superfluous Si and Zn elements also may make up spot corrosion source, and anode is compared with mist and secretly.Due to Fe, Mn, Cr content is higher, at anodic oxidation After reason, product has strain line sense, and decorative effect is poor, it is impossible to meet requirement of the consumer to electronic product outward appearance and texture.

In comparative example 2, Mg2It is 0.03% that Si is 1.199%, Cu, and alloy hardness after T6 process is HV93-98, slightly It is low.Fe is 0.18%, and superfluous Si is 0.111%, as phase containing Fe drops to form etch pit in anodic oxidation corrosion process, mistake Surplus Si also may make up spot corrosion source, and anode is compared with mist and secretly.Decorative effect is poor, it is impossible to which meeting consumer will to the height of electronic product outward appearance Ask.

Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention not by above-described embodiment Limit, other any spirit without departing from the present invention and the change, modification, replacement made under principle, combine, simplification, Equivalent substitute mode is should be, is included within protection scope of the present invention.

Claims (10)

1. a kind of consumer electronics shell aluminium alloy, it is characterised in that comprising following component by mass percentage：Si is 0.38～0.48%, Mg be 0.55～0.70%, Fe≤0.12%, Mn≤0.03%, Cr≤0.03%, Cu be 0.10～ 0.30%, Zn≤0.03%, Ti≤0.10%, other impurities total amount ＜ 0.15%, balance of Al；Wherein, Mn+Cr≤ 0.05%, Si≤Mg/1.732+0.08%.
2. consumer electronics shell aluminium alloy according to claim 1, it is characterised in that comprising following by quality percentage Than the component counted：Si be 0.43～0.46%, Mg be 0.62～0.68%, Fe≤0.11%, Mn≤0.02%, Cr≤ 0.03%, Cu be 0.20～0.28%, Zn≤0.01%, Ti≤0.10%, other impurities total amount ＜ 0.15%, balance of Al； Wherein, Si≤Mg/1.732+0.08%.
3. a kind of preparation method of consumer electronics shell aluminium alloy, it is characterised in that comprise the steps：
(1) got the raw materials ready according to the mass percent described in claim 1 or 2, wherein, aluminum and magnesium adopt aluminium ingot and magnesium ingot；
(2) aluminium ingot is loaded into smelting furnace, is heated to 730～760 DEG C and is melted, adding magnesium ingot and intermediate alloy carries out alloy Change, obtain aluminum melt A；
(3) refining agent is added in aluminum melt A, carry out refine in 730～750 DEG C, be passed through while refine in aluminum melt A Refinery gas are stirred, aerofluxuss, skim, and obtain aluminum melt B；
(4) melt B is stood, obtains aluminum melt C；
(5) aluminum melt C is cast, casting temperature is controlled at 680～710 DEG C, is obtained alloy circle ingot casting；
(6) alloy for obtaining circle ingot casting is heated to 7 hours being incubated after 565 ± 5 DEG C, then is cooled to by force room temperature with water smoke, disappeared Expense electronics shell aluminium alloy.
4. the preparation method of consumer electronics shell aluminium alloy according to claim 3, it is characterised in that：
Described in step (3) obtain aluminum melt B also include trimming the step of：By the aluminum melt B for obtaining carry out chemistry into Analysis, if alloying component is not in the range of described in step (1), by trimming, alloying component is controlled in step Suddenly in the scope described in (1)；
The aluminum melt C that obtains described in step (4) also includes the step of purifying：Aluminum melt C is passed sequentially through into depassing unit and double Level filtration system is purified.
5. the preparation method of consumer electronics shell aluminium alloy according to claim 3, it is characterised in that：
The addition of the refining agent described in step (3) presses 2kg/ ton aluminum melts A calculating；
Refinery gas described in step (3) are high-purity argon gas；
The temperature for carrying out refine described in step (3) is 740 DEG C, the 40 minutes time of refine；
The time of the standing described in step (4) is 25～40 minutes；
The method of the casting described in step (5) is semicontinuous water cooling casting method.
6. the consumer electronics shell aluminium alloy described in claim 1 or 2 is preparing consumer electronics shell aluminium alloy base Application in material.
7. a kind of consumer electronics shell aluminum alloy base material, it is characterised in that comprise the following steps：
1. the consumer electronics shell described in claim 1 or 2 is loaded with aluminium alloy and is heated in aluminium bar pot arch；
2. the aluminium alloy after heating is loaded extruder again to be extruded；
3. press quenching is carried out after extruding, obtain aluminum alloy materials；
4. aluminum alloy materials are carried out into tension straingtening；
5. carry out artificial aging technique.
8. consumer electronics shell aluminum alloy base material according to claim 7, it is characterised in that：
Step 1. described in aluminium bar pot arch be three area's heating modes aluminium bar pot arch：Entrance preheating zone temperature be 500～ 530 DEG C, moderate soak area temperature is 540～560 DEG C, and outlet area temperature is 500～560 DEG C；
Step 5. described in the condition of artificial aging technique be：170 ± 5 DEG C are incubated 10 hours.
9. consumer electronics shell aluminum alloy base material according to claim 7, it is characterised in that：
Step 1. described in heating time be 2～5 hours；
Step 2. described in the temperature of extruding be 500～560 DEG C, the speed of extruding is 1.5～3.0mm/s；
Step 3. described in press quenching cooldown rate be 40 DEG C/s；
Step 4. described in the amount of tension for carrying out tension straingtening be 1～3%.
10. a kind of consumer electronics shell, it is characterised in that：Including with the consumer electronics as described in any one of claim 7～9 The metal shell that product shell is made of aluminum alloy base material.
CN201611270251.7A 2016-12-30 2016-12-30 A kind of consumer electronics shell aluminium alloy and its preparation method and application CN106521268B (en)

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CN108677111A (en) * 2018-06-13 2018-10-19 合肥同佑电子科技有限公司 A kind of electronic product casing high-performance extruding aluminium alloy and preparation method thereof
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