CN106466711A - Method and die casting appearance member that die-casting material and its reperforating method and die-casting material electroplating surface are processed - Google Patents
Method and die casting appearance member that die-casting material and its reperforating method and die-casting material electroplating surface are processed Download PDFInfo
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Abstract
The present invention relates to a kind of have coated die-casting material, and a kind of reperforating method of die-casting material, the method includes：To have the die-casting material isothermal holding of the coat of metal, then cool down, the metal forming the described coat of metal will be stannum and/or lead, and the temperature of described isothermal holding is higher than the fusing point of the coat of metal, and the fusing point less than die-casting material；The invention still further relates to the die-casting material that the method is obtained；Further relate to a kind of method that die-casting material electroplating surface is processed；And the die casting appearance member that the method electroplating processes obtain.The porosity of the die-casting material that the reperforating method of the present invention obtains significantly reduces, and its surface defines densification, the complete, layer of uniformly continuous, the die-casting material obtaining after this perforations adding is electroplated, the porosity having coated appearance member can be reduced further, solve the problems, such as that having defective die-casting material in prior art is not suitable as appearance member, has widened range of application on looking products for the die-casting material.
Description
Technical field
The present invention relates to a kind of reperforating method of die-casting material, and the die-casting material that the method is obtained, also
It is related to a kind of method that die-casting material electroplating surface is processed, the die casting appearance member that the method obtains.
Background technology
The feature of die-casting material is that material is not fine and close, contains quantity in its inside and near surface position more
Defect, this kind of defect be generally pore and pinprick.In these defects usually press casting procedure, material is fast
It is involved in gas and is formed during speed filling mould, defect is generally irregular circular opening, aperture is that number is micro-
To hundreds of microns, depth is a few micrometers extremely hundreds of microns to rice, and defect is irregularly distributed in material, because
No matter how thick material surface removed by this, each layer all can have new defect to occur on fresh face, and these are scarce
Visible under the conditions of being trapped in naked eyes or amplifying.Because defect can reduce the presentation quality of die-casting material, therefore press
Casting application on looking products for the material is restricted, and is more applied on infrastructure product.
At present, there is a kind of method of Organic substance sealing of hole, will soak through the die-casting material of surface preparation
In Organic substance solvent, so that organic molecule is entered in the hole of material surface, then take out die-casting material
Organic substance is made to solidify and seal surface hole defect.But, the weak point being existed with the method for Organic substance sealing of hole
For：Organic substance can pollute plating solution, be not suitable for carrying out electroplating processes again, be unsuitable to apply to after Organic substance sealing of hole
On product with coating as outer surface, and relatively it is suitable for use on the product with coating or sealing of hole as outer surface,
Therefore applicable surface is not wide.When with sealing of hole for outer surface, due to the physicochemical property of Organic substance and metal material
Difference, Organic substance easily loose or dislocation in hole under complex environment, causes sealing of hole effect to reduce.
Therefore, now it is badly in need of one kind and can effectively reduce die-casting material defect so as to be more suitable for coating
Die-casting material reperforating method for the product of outer surface.
Content of the invention
The invention aims to die-casting material generally existing defect in solution prior art, limit its work
For the problem of the use of appearance member, provide a kind of reperforating method of die-casting material, and the method is obtained
Die-casting material, and a kind of method that die-casting material electroplating surface is processed, and the die casting outward appearance that the method obtains
Part.
The present inventor finds under study for action, will have the die-casting material isothermal holding of the coat of metal,
Then cool down, the metal forming the described coat of metal is stannum and/or lead, and the temperature of described isothermal holding is higher than
The fusing point of the coat of metal, and it is less than the fusing point of die-casting material such that it is able to reduce the die-casting material obtaining
Porosity.
Therefore, to achieve these goals, on the one hand, the invention provides a kind of have coated die casting
Material, this die-casting material includes die-casting material matrix and covers the metal-plated on this die-casting material matrix
Layer, the metal forming the described coat of metal is stannum and/or lead, and the porosity of the described coat of metal is less than 1.0,
Preferably shorter than 0.5.
On the other hand, present invention also offers a kind of reperforating method of die-casting material, the method includes：Will
There is the die-casting material isothermal holding of the coat of metal, then cool down, the metal forming the described coat of metal is
Stannum and/or lead, the temperature of described isothermal holding is higher than the fusing point of the coat of metal, and molten less than die-casting material
Point.
The third aspect, present invention also offers the die-casting material that said method is obtained.
Fourth aspect, present invention also offers a kind of method that die-casting material electroplating surface is processed, the method
Including：Adopt and carry out perforations adding with the aforedescribed process, then carry out electroplating processes again.
5th aspect, present invention also offers the die casting appearance member that said method electroplating processes obtain.
The porosity of the die-casting material that the reperforating method of the present invention obtains significantly reduces, and its surface defines
Fine and close, the complete, layer of uniformly continuous, the die-casting material obtaining is electroplated, Ke Yijin after this perforations adding
One step reduces the porosity having coated appearance member, overcomes the defective pressure of internal tool in prior art
Casting material is not suitable as the defect of appearance member, expands application on looking products for the die-casting material.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Brief description
Fig. 1 is the electron scanning Electronic Speculum on the surface of the appearance member of pack alloy plate that embodiment 1 is obtained
Figure.
Specific embodiment
Hereinafter the specific embodiment of the present invention is described in detail.It should be appreciated that this place is retouched
The specific embodiment stated is merely to illustrate and explains the present invention, is not limited to the present invention.
On the one hand, the invention provides a kind of have coated die-casting material, this die-casting material includes die casting
The material matrix and covering coat of metal on this die-casting material matrix, forms the metal of the described coat of metal
For stannum and/or lead, the porosity of the described coat of metal is less than 1.0, preferably shorter than 0.5.
Second aspect, present invention also offers a kind of reperforating method of die-casting material, the method includes：Will
There is the die-casting material isothermal holding of the coat of metal, then cool down, the metal forming the described coat of metal is
Stannum and/or lead, the temperature of described isothermal holding is higher than the fusing point of the coat of metal, and molten less than die-casting material
Point.
Those skilled in the art knows, die-casting material matrix is generally copper, magnesium, aluminum and zinc etc. coloured gold
Belong to alloy, their fusing point is typically between 400-1100 DEG C, and the fusing point of metallic tin is 232 DEG C, gold
The fusing point belonging to lead is 328 DEG C.
According to reperforating method of the present invention, wherein, there is the formation side of the die-casting material of the coat of metal
Method can be conventional coat of metal preparation method, for example, can be existed by chemical plating or electric plating method
Have the formation coat of metal on the surface of defective die-casting material matrix, or by conventional PVD, spray
The methods such as painting, dash coat are prepared the coat of metal.Due to compared with plating, chemical plating simple to operate,
Covering power is good, coating good corrosion resistance, and effect is good, the method therefore preferably employing chemical plating.This
The technical staff in field knows, the method for chemical plating can be divided into four classes, respectively reducing process, immersion plating,
Disproportionation reaction method and calorizing, wherein, optimum for reducing process, the metal-plated of different-thickness can be obtained
Layer.
In the preferred embodiment of the present invention, reducing process includes：(1) configure plating solution；(2) adjust
Whole bath pH value is to 0.6-1.2；(3) it is heated to using temperature 65-85 DEG C, and be incubated 30min；(4)
Die-casting material is placed in plating solution immersion deposition 0.5-10h at 65-85 DEG C.Wherein, in step (1)
The composition of plating solution includes：Stannous chloride 45-50g/L, tartaric acid 32-35g/L, thiourea 20-25g/L,
Citric acid 27-30g/L, sodium hypophosphite 23-28g/L, hydroquinone 2.5-3g/L, Macrogol 600
20-25mL/L, hydrochloric acid 80-100mL/L, solvent is water.
According to reperforating method of the present invention it is preferable that forming the die-casting material with the coat of metal
Before, die-casting material raw material is carried out with the pretreatment of various routines, it is highly preferred that described pretreatment is wrapped successively
Include：Die-casting material raw material is carried out with defat, pickling, polishing and leaching zinc process.Wherein, defat, pickling,
The method of polishing and leaching zinc process can be the conventional method in this area.
For example：Ungrease treatment can include：(1) configure degreasant solution；(2) defat that configuration is obtained
Solution is heated to 45-65 DEG C, is incubated 25-35min；(3) die-casting material raw material is placed in degreasant solution
Carry out ultrasonic degreasing 5-20min at 45-65 DEG C；(4) wash die-casting material raw material, wherein, defat is molten
The composition of liquid includes：Sodium phosphate 20-30g/L, sodium carbonate 15-20g/L, sodium tripolyphosphate 1-5g/L, silicon
Sour sodium 10-15g/L, sodium metasilicate 1-5g/L, sodium hydroxide 5-15g/L, OP-101-3g/L, solvent is
Water.
Pickling processes can include：(1) configure pickle；(2) die-casting material after defat is placed in acid
1-3min is soaked in washing liquid；(3) wash die-casting material.Wherein, pickle can selected from sulphuric acid, nitric acid,
At least one in sulfuric acid-chromic acid, chromic acid-phosphoric acid, sulphuric acid-sodium fluoride, phosphoric acid-fluoride, specifically may be used
To be selected according to handled sample material, the concentration selection of various combinations can be：Sulphuric acid
15-25%, nitric acid 10-25%, sulphuric acid 15%+ chromic acid 5%, phosphoric acid 5%+ chromic acid 17g/L, sulphuric acid 5-10%+
Sodium fluoride 7.5-15g/L, phosphoric acid 20%+ Fluohydric acid. 7.5mL//L.Wherein sulfuric acid-chromic acid system is at 35-60 DEG C
Use, chromic acid-Phosphoric Acid uses at 30-50 DEG C, other systems all use at room temperature.
Polishing can include：(1) configure polishing fluid；(2) die-casting material after pickling is placed in throwing
In light liquid, every 30s takes out observing effect, treats that surface uniform glossiness and can be taken off, generally throws
Light time control is more suitable in 1-3min；(3) take out sample, wash immediately, remove remained on surface
Solution, then wash 2-3 time.Polishing fluid consists of the conventional polishing fluid in this area.
Leaching zinc processes and can include：(1) configure zincate solution and move back zinc liquid；(2) by the die casting material after polishing
Material is placed in leaching zinc 30-90s in zincate solution, uniform cinerouss to surface and replaces film layer；(3) by
Once the sample after leaching zinc is placed in and moves back in zinc liquid, suitably swings, and moves back the zinc time for 5-15s, surface is in
Stop during the cinerouss of glimmering luster；(4) sample moving back zinc is again placed in zincate solution second leaching zinc,
30-60s, the time, leaching zinc was short than first time；(5) clean.Wherein, the composition of zincate solution can include：
Sodium hydroxide 100-110g/L, zinc oxide 8-9g/L, sodium potassium tartrate tetrahydrate 10-12g/L, ferric chloride 2-3g/L,
Sodium nitrate 2-4g/L, Nickel dichloride. 15-17g/L；Moving back zinc liquid can be nitric acid system or nitrate acid and hydrofluoric acid body
System, nitric acid system can be 50% nitric acid, and nitrate acid and hydrofluoric acid system can be 50% nitric acid, 5-10% hydrogen
Fluoric acid.
According to reperforating method of the present invention, wherein, the thickness of the described coat of metal can be broad
In the range of select, but, for the porosity that reduces further within die-casting material and ensure prepared
Die-casting material surface forms densification, the complete, layer of uniformly continuous it is preferable that the thickness of the coat of metal is
5-30 μm, more preferably 10-20 μm.
According to reperforating method of the present invention, wherein, isothermal holding can be the conventional insulation in this area
Process it is preferable that the condition of described isothermal holding includes：20-30min is warming up to 300-340 DEG C, protects
Warm 0.5-1h such that it is able to reduce the porosity of prepared die-casting material further, in the present invention, be from
Room temperature starts to warm up to 300-340 DEG C.
According to reperforating method of the present invention, wherein, described cooling can be conventional cooling, preferably
Cool down such that it is able to prevent the too fast combination causing between the coat of metal and die-casting material of cooling rate for gradient cooling
Power declines, and then can more effectively reduce the porosity of prepared die-casting material, to improve die-casting material
The consistency on surface and stability.
In the present invention, in a kind of preferred embodiment, described gradient cooling cooling includes：It is cooled to
200-250 DEG C, it is incubated 10-30min, then is cooled to room temperature such that it is able to reduce prepared pressure further
The porosity of casting material, to improve consistency and the stability on die-casting material surface.
In the present invention, in another kind of preferred embodiment, described gradient cooling cooling includes：Cooling
To 300-320 DEG C, it is incubated 10-15min, is then cooled to 250-270 DEG C, be incubated 15-20min, then
It is cooled to 200-220 DEG C, be incubated 10-30min, be finally cooled to room temperature such that it is able to reduce further
The porosity of prepared die-casting material, to improve consistency and the stability on die-casting material surface.
According to reperforating method of the present invention, wherein it is preferred to, described isothermal holding and be cooled in true
Carry out under empty condition such that it is able to reduce the porosity of die-casting material further, to improve die-casting material table
The consistency in face and stability.Wherein, vacuum condition can be the conventional vacuum condition in this area, preferably
Ground, this vacuum condition includes：Vacuum is 10-2-100Pa.
The third aspect, present invention also offers the die-casting material of said method preparation.
In the present invention, the porosity of the die-casting material being obtained by above-mentioned reperforating method can be less than 1.0,
Preferably shorter than 0.5, surface defines densification, uniform pantostrat, is easy to follow-up plating etc. and processes,
Can be used as the material of appearance member.
Fourth aspect, present invention also offers a kind of method that die-casting material electroplating surface is processed, the method
Including：Adopt and carry out perforations adding with the aforedescribed process, then carry out electroplating processes again.
In the present invention, electroplating processes can be the conventional electroplating processes in this area, for example can for nickel plating,
Copper facing or chromium plating.
Preferably, before carrying out electroplating processes, the method also includes：The die-casting material that perforations adding is obtained enters
Row activation.Wherein, the method for activation can be the conventional activation in this area, for example：In 40-50% sulfur
Soak 10-30s in acid solution, or soak 30s-3min in palladium activating solution, wherein, palladium activating solution can
Think Palladous chloride. 100ppm, ammonium chloride 10%, the aqueous solution of hydrochloric acid 15%.
Wherein, the method for nickel plating can include：Prepare sulfur acid nickel 20g/L, sodium hypophosphite 20g/L,
Citric acid 20g/L, malic acid 6g/L, the chemical nickel-plating solution of sodium fluoride 3g/L, pH value is adjusted to 4-5,
It is heated to 80-90 DEG C, sample is placed in plating solution, change plating time 40-50min.
5th aspect, present invention also offers the die casting appearance member that said method electroplating processes obtain.
Embodiment
Embodiment 1
The present embodiment is used for reperforating method and its prepared die-casting material and the die-casting material of the present invention is described
Method and its prepared die casting appearance member that electroplating surface is processed.
(1) ungrease treatment：Configuration degreasant solution；The degreasant solution that configuration is obtained is heated to 50 DEG C,
Insulation 25min；Pack alloy plate (trade mark is the Japanese aluminium alloy plate of ADC12) is placed in defat
Carry out ultrasonic degreasing 10min at 50 DEG C in solution；Then pack alloy plate, wherein, defat are washed
The consisting of of solution：Sodium phosphate 20g/L, sodium carbonate 15g/L, sodium tripolyphosphate 5g/L, sodium silicate 10g/L,
Sodium metasilicate 1g/L, sodium hydroxide 5g/L, OP-101g/L, solvent is water.
(2) pickling processes：Configure 15% aqueous solution of nitric acid；Then by the pack alloy plate after defat
It is placed in immersion 2min in aqueous solution of nitric acid；Finally wash pack alloy plate.
(3) polishing：Configure 25% sulphuric acid and the polishing fluid of 75% phosphoric acid；Then by after pickling
Pack alloy plate is placed in chemical polishing at 85 DEG C in this polishing fluid, and every 30s takes out observing effect, treats table
Uniform glossiness and can be taken off (polishing time is 90s) in face；Finally take out sample, wash immediately,
Remove remained on surface solution, then wash 2 times.
(4) leaching zinc is processed：Configure zincate solution and move back zinc liquid；Then by the pack alloy plate after polishing
It is placed in leaching zinc 60s in zincate solution, to surface, uniform cinerouss occur and replace film layer；Again first time is soaked
Sample after zinc is placed in the moving back in zinc liquid of 50% nitric acid, suitably swings, and moving back the zinc time is 10s, surface
Stop during cinerouss in glimmering luster；(4) sample moving back zinc is again placed in zincate solution second leaching zinc
30s；Finally clean.Wherein, the consisting of of zincate solution：Sodium hydroxide 100g/L, zinc oxide 8g/L,
Sodium potassium tartrate tetrahydrate 10g/L, ferric chloride 2g/L, sodium nitrate 2g/L, Nickel dichloride. 15g/L, solvent is water.
(5) tin plating：Configuration plating solution；Adjustment bath pH value is to 0.8；It is heated at 70 DEG C, and be incubated
30min；Then the pack alloy plate after leaching zinc is placed in plating solution immersion deposition 3h at 70 DEG C, obtains
Thickness to coating is 10 μm.Wherein, the consisting of of plating solution：Stannous chloride 45g/L, tartaric acid 32g/L,
Thiourea 20g/L, citric acid 27g/L, sodium hypophosphite 23g/L, hydroquinone 2.5g/L, Polyethylene Glycol
60020mL/L, hydrochloric acid 80mL/L, solvent is water.
(6) perforations adding：Pack alloy plate (tin coating thickness is 10 μm) after will be tin plating is placed in vacuum
In resistance furnace, vacuum is 20Pa, and then in-furnace temperature rises in 30min 300 DEG C of insulation 1h,
Then water-cooled cooling, to 200 DEG C, is incubated 20min, and then water-cooled cooling, to room temperature, washes sample.
(7) activation nickel plating：Pack alloy plate after perforations adding is soaked in 40% sulfuric acid solution 30s
Activated, then configured nickel-plating liquid, carrying out is plated 40min, wherein, the concrete side of configuration nickel-plating liquid
Method is：Nickel-plating liquid by nickel sulfate 20g/L, sodium hypophosphite 20g/L, citric acid 20g/L, malic acid 6g/L,
Sodium fluoride 3g/L, solvent forms for water, and then pH value is adjusted to 4.5, is heated to 80 DEG C, standby, system
Obtain the appearance member C1 of pack alloy plate.
Embodiment 2
The present embodiment is used for reperforating method and its prepared die-casting material and the die-casting material of the present invention is described
Method and its prepared die casting appearance member that electroplating surface is processed.
Step (1), (2), (3) and (4) according to embodiment 1 carries out pack alloy plate respectively
Ungrease treatment, pickling processes, polishing and leaching zinc are processed；
(5) tin plating：Configuration plating solution；Adjustment bath pH value is to 0.6；It is heated at 80 DEG C, and be incubated
30min；Then the pack alloy plate after leaching zinc is placed in plating solution immersion deposition 5h at 80 DEG C, obtains
Thickness to coating is 20 μm.Wherein, the consisting of of plating solution：Stannous chloride 45g/L, tartaric acid 32g/L,
Thiourea 20g/L, citric acid 27g/L, sodium hypophosphite 23g/L, hydroquinone 2.5g/L, Polyethylene Glycol
60020mL/L, hydrochloric acid 80mL/L, solvent is water.
(6) perforations adding：Pack alloy plate (tin coating thickness is 20 μm) after will be tin plating is placed in vacuum
In resistance furnace, vacuum is 10Pa, and then in-furnace temperature rises in 20min 340 DEG C of insulation 0.5h,
Then water-cooled cooling, to 300 DEG C, is incubated 10min, and then water-cooled cooling is incubated 20min to 250 DEG C, then
It is cooled to 200 DEG C of insulation 20min, last water-cooled to room temperature with stove, wash sample.
(7) activation nickel plating：By the pack alloy plate after perforations adding in palladium activated solution (Palladous chloride.
100ppm, ammonium chloride 10%, the aqueous solution of hydrochloric acid 15%) in soak 3min activated, Ran Houpei
Put nickel-plating liquid, carrying out plates 45min, wherein, the concrete grammar of configuration nickel-plating liquid is：Nickel-plating liquid is by sulfur
Sour nickel 20g/L, sodium hypophosphite 20g/L, citric acid 20g/L, malic acid 6g/L, sodium fluoride 3g/L,
Solvent forms for water, and then pH value is adjusted to 4.5, is heated to 80 DEG C, standby, prepared pack alloy
The appearance member C2 of plate.
Embodiment 3
The present embodiment is used for reperforating method and its prepared die-casting material and the die-casting material of the present invention is described
Method and its prepared die casting appearance member that electroplating surface is processed.
Step (1), (2), (3) and (4) according to embodiment 1 carries out pack alloy plate respectively
Ungrease treatment, pickling processes, polishing and leaching zinc are processed；
(5) tin plating：Configuration plating solution；Adjustment bath pH value is to 1.2；It is heated at 85 DEG C, and be incubated
30min；Then the pack alloy plate after leaching zinc is placed in plating solution immersion deposition 0.5h at 85 DEG C,
The thickness obtaining coating is 15 μm.Wherein, the consisting of of plating solution：Stannous chloride 50g/L, tartaric acid
35g/L, thiourea 25g/L, citric acid 30g/L, sodium hypophosphite 28g/L, hydroquinone 3g/L, poly-
Ethylene glycol 60025mL/L, hydrochloric acid 100mL/L, solvent is water.
(6) perforations adding：Pack alloy plate (tin coating thickness is 15 μm) after will be tin plating is placed in vacuum
In resistance furnace, vacuum is 1Pa, and then in-furnace temperature rises in 25min 320 DEG C of insulation 0.8h,
Then water-cooled cooling, to 200 DEG C, is incubated 30min, and then water-cooled cooling, to room temperature, washes sample.
(7) activation nickel plating：By the pack alloy plate after perforations adding in palladium activated solution (Palladous chloride.
100ppm, ammonium chloride 10%, the aqueous solution of hydrochloric acid 15%) in soak 3min activated, Ran Houpei
Put nickel-plating liquid, carrying out plates 45min, wherein, the concrete grammar of configuration nickel-plating liquid is：Nickel-plating liquid is by sulfur
Sour nickel 20g/L, sodium hypophosphite 20g/L, citric acid 20g/L, malic acid 6g/L, sodium fluoride 3g/L,
Solvent forms for water, and then pH value is adjusted to 4.5, is heated to 80 DEG C, standby, prepared pack alloy
The appearance member C3 of plate.
Embodiment 4
The present embodiment is used for reperforating method and its prepared die-casting material and the die-casting material of the present invention is described
Method and its prepared die casting appearance member that electroplating surface is processed.
Method according to embodiment 1 prepares die-casting material and die casting appearance member, except for the difference that, step (5)
In, configure plating solution；Adjustment bath pH value is to 0.5；It is heated at 60 DEG C, and be incubated 30min；Then
Pack alloy plate after leaching zinc is placed in plating solution immersion deposition 0.3h at 60 DEG C, obtains the thickness of coating
Spend for 5 μm, the appearance member C4 of prepared pack alloy plate.
Embodiment 5
The present embodiment is used for reperforating method and its prepared die-casting material and the die-casting material of the present invention is described
Method and its prepared die casting appearance member that electroplating surface is processed.
Method according to embodiment 1 prepares die-casting material and die casting appearance member, except for the difference that, step (6)
In, isothermal holding is：40min rises to 350 DEG C, is incubated 1.2h, the outward appearance of prepared pack alloy plate
Part C5.
Embodiment 6
The present embodiment is used for reperforating method and its prepared die-casting material and the die-casting material of the present invention is described
Method and its prepared die casting appearance member that electroplating surface is processed.
Method according to embodiment 1 prepares die-casting material and die casting appearance member, except for the difference that, step (6)
In, after 300 DEG C of insulation 1h, direct water-cooling is cooled to room temperature, the appearance member C6 of prepared pack alloy plate.
Test case
Detect the table of the appearance member of the pack alloy plate that embodiment 1-6 is obtained using electron scanning Electronic Speculum
Face, wherein, the result of embodiment 1 is shown in Fig. 1.
According to the porosity of the nickel coating of GB GB5935-1986 determination sample C1-C6, the results are shown in Table 1.
Table 1
| Appearance member sample | C1 | C2 | C3 | C4 | C5 | C6 |
| Porosity | 0.35 | 0.2 | 0.35 | 0.45 | 0.46 | 0.48 |
Can be seen that the hole of the die-casting material obtaining using the reperforating method of the present invention by Fig. 1 and Biao 1
Gap rate significantly reduces, and its surface defines densification, continuous and uniform layer, by obtain after this perforations adding
Die-casting material carries out nickel plating, can reduce the porosity of the appearance member with nickel coating further.
Embodiment 1 is compared with embodiment 4 as can be seen that the thickness of the coat of metal of die-casting material is
Such that it is able to reducing the porosity within die-casting material further and ensureing prepared die casting when 10-20 μm
Material surface forms densification, the complete, layer of uniformly continuous.
Embodiment 1 is compared with embodiment 5 as can be seen that the condition of isothermal holding includes：20-30min
It is warming up to 300-340 DEG C, such that it is able to reduce prepared die-casting material further during insulation 0.5-1h
Porosity.
Embodiment 1 is compared with embodiment 6 as can be seen that be cooled to gradient cooling cooling when, so as to
Enough prevent the too fast adhesion causing between the coat of metal and die-casting material of cooling rate from declining, and then can be more effective
Ground reduces the porosity of the die-casting material being obtained, to improve consistency and the stability on die-casting material surface.
The porosity of the die-casting material that the reperforating method of the present invention obtains significantly reduces, and its surface defines
Fine and close, the complete, layer of uniformly continuous, the die-casting material obtaining is electroplated, Ke Yijin after this perforations adding
One step reduces the porosity having coated appearance member, solves and has defective die casting material in prior art
Material is not suitable as the problem of appearance member, has widened range of application on looking products for the die-casting material.
The preferred embodiment of the present invention described in detail above, but, the present invention is not limited to above-mentioned reality
Apply the detail in mode, in the range of the technology design of the present invention, can be to the technical side of the present invention
Case carries out multiple simple variant, and these simple variant belong to protection scope of the present invention.
It is further to note that each particular technique described in above-mentioned specific embodiment is special
Levy, in the case of reconcilable, can be combined by any suitable means, in order to avoid need not
The repetition wanted, the present invention no longer separately illustrates to various possible compound modes.
Additionally, combination in any can also be carried out between the various different embodiment of the present invention, as long as its
Without prejudice to the thought of the present invention, it equally should be considered as content disclosed in this invention.
Claims (12)
1. a kind of have coated die-casting material it is characterised in that this die-casting material includes die-casting material
The matrix and covering coat of metal on this die-casting material matrix, the metal forming the described coat of metal is stannum
And/or lead, the porosity of the described coat of metal is less than 1.0, preferably shorter than 0.5.
2. a kind of reperforating method of die-casting material is it is characterised in that the method includes：To have metal
The die-casting material isothermal holding of coating, then cools down, and the metal forming the described coat of metal is stannum and/or lead,
The temperature of described isothermal holding is higher than the fusing point of the coat of metal, and the fusing point less than die-casting material.
3. method according to claim 2, wherein, the thickness of the described coat of metal is 5-30 μm,
It is preferably 10-20 μm.
4. method according to claim 2, wherein, the condition of described isothermal holding includes：
20-30min is warming up to 300-340 DEG C, is incubated 0.5-1h.
5. the method according to any one in claim 2-4, wherein, described is cooled to gradient
Cooling down.
6. method according to claim 5, wherein, described gradient cooling cooling includes：Cooling
To 200-250 DEG C, it is incubated 10-30min, then is cooled to room temperature.
7. method according to claim 5, wherein, described gradient cooling cooling includes：Cooling
To 300-320 DEG C, it is incubated 10-15min, is then cooled to 250-270 DEG C, be incubated 15-20min, then
It is cooled to 200-220 DEG C, be incubated 10-30min, be finally cooled to room temperature.
8. method according to claim 2, wherein, described isothermal holding and be cooled in vacuum bar
Carry out under part.
9. the die-casting material that in claim 2-8 prepared by the method described in any one.
10. die-casting material according to claim 9, wherein, the porosity of this die-casting material is less than
1.0, preferably shorter than 0.5.
The method that a kind of 11. die-casting material electroplating surfaces are processed is it is characterised in that the method includes：Adopt
Carry out perforations adding with the method described in claim 2-8, then carry out electroplating processes again.
The die casting appearance member that method electroplating processes described in 12. claim 11 obtain.
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| CN107245745A (en) * | 2017-06-12 | 2017-10-13 | 歌尔股份有限公司 | Die casting surface treatment method and die casting |
| CN108611642A (en) * | 2018-05-14 | 2018-10-02 | 哈尔滨工业大学（威海） | Dezincifying solution after a kind of magnesium lithium alloy leaching zinc |
| CN109128159A (en) * | 2018-09-21 | 2019-01-04 | 歌尔股份有限公司 | A kind of method and mold of the roughness on the surface for reducing coarse material |
| CN109898115A (en) * | 2019-03-25 | 2019-06-18 | 广东工业大学 | Electro-coppering pre-treating method on a kind of quick aluminum substrate |
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