CN103786386A - ABS plastic surface coatings and preparing method thereof - Google Patents
ABS plastic surface coatings and preparing method thereof Download PDFInfo
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- CN103786386A CN103786386A CN201410072494.4A CN201410072494A CN103786386A CN 103786386 A CN103786386 A CN 103786386A CN 201410072494 A CN201410072494 A CN 201410072494A CN 103786386 A CN103786386 A CN 103786386A
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- abs plastic
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- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 title claims abstract description 72
- 238000000576 coating method Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title abstract description 18
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 172
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 86
- 239000011248 coating agent Substances 0.000 claims abstract description 40
- 238000005491 wire drawing Methods 0.000 claims abstract description 40
- 238000001035 drying Methods 0.000 claims abstract description 18
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 13
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 13
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 13
- 238000007747 plating Methods 0.000 claims abstract description 10
- 239000007921 spray Substances 0.000 claims description 21
- 238000005507 spraying Methods 0.000 claims description 20
- 239000003973 paint Substances 0.000 claims description 17
- 238000002360 preparation method Methods 0.000 claims description 12
- 238000002203 pretreatment Methods 0.000 claims description 10
- 238000006555 catalytic reaction Methods 0.000 claims description 6
- 238000006386 neutralization reaction Methods 0.000 claims description 6
- 230000003116 impacting effect Effects 0.000 claims description 5
- 239000004677 Nylon Substances 0.000 claims description 4
- 229920001778 nylon Polymers 0.000 claims description 4
- 239000004814 polyurethane Substances 0.000 claims description 4
- 238000011536 re-plating Methods 0.000 claims description 2
- 239000000725 suspension Substances 0.000 claims description 2
- 229920002635 polyurethane Polymers 0.000 claims 1
- 238000009713 electroplating Methods 0.000 abstract description 14
- 229920003023 plastic Polymers 0.000 abstract description 12
- 239000004033 plastic Substances 0.000 abstract description 12
- 239000000126 substance Substances 0.000 abstract description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052802 copper Inorganic materials 0.000 abstract description 6
- 239000010949 copper Substances 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 238000005238 degreasing Methods 0.000 abstract 2
- 239000010410 layer Substances 0.000 abstract 2
- 230000003472 neutralizing effect Effects 0.000 abstract 1
- 238000007781 pre-processing Methods 0.000 abstract 1
- 239000002344 surface layer Substances 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000002161 passivation Methods 0.000 description 3
- 101000724404 Homo sapiens Saccharopine dehydrogenase Proteins 0.000 description 2
- 102100028294 Saccharopine dehydrogenase Human genes 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 230000004087 circulation Effects 0.000 description 2
- 230000001351 cycling effect Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 208000014451 palmoplantar keratoderma and congenital alopecia 2 Diseases 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229920006834 PC+ABS Polymers 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000016 photochemical curing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Abstract
The invention discloses ABS plastic surface coatings and a preparing method thereof and relates to the field of plastic surface processing. The ABS plastic surface coatings include a chemical nickel coating, an impact nickel coating, a semi-bright nickel coating and an organic coating which are arranged sequentially from the ABS plastic layer, wherein the chemical nickel coating is 0.05 micron - 0.5 micron thick, the impact nickel coating is 1 micron - 3 microns thick, the semi-bright nickel coating is 3 microns - 8 microns thick, and the organic coating is 10 microns - 20 microns thick. The preparing method comprises the steps that ABS plastic preprocessing is conducted, wherein chemical degreasing, coarsening, neutralizing, catalyzing, peptizing and chemical nickel coating plating are conducted sequentially; the chemical nickel coating is electroplated with impact nickel to obtain the impact the nickel coating, and then semi-bright nickel coating electroplating is conducted; wiredrawing is conducted on the semi-bright nickel coating; hydrocarbon vacuum degreasing and drying are conducted on the wiredrawn ABS plastic electroplated piece, and then the processed ABS plastic electroplated piece is coated with the organic coating. Due to the fact that no copper coating exists on the surface layer, the thickness of the original nickel layer is reduced, metal resources are saved, the technological process is shortened, and production cost can also be greatly reduced.
Description
Technical field
The present invention relates to frosting processing, particularly relate to a kind of ABS plastic face coat and preparation method.
Background technology
The plastics that are widely used at present electroplating have ABS ﹑ PC+ABS and PA, and the plastics that are applied to sanitaryware mainly contain ABS plastic, and plastic electroplating is exactly to adopt certain processing method, first obtains conducting film at frosting, the process of then thickening with electric plating method.Therefore plastic electroplating technique also can be divided into simply two greatly step, the pre-treatment that the first step is plastic electroplating: oil removing → alligatoring → neutralization → catalysis → dispergation → chemical nickel; Second step is plastic electroplating: nickel preplating → bright copper → semi-bright nickel; The 3rd step is wire drawing → oil removing → passivation → spraying, and the paint of spraying divides and mainly contains two kinds according to light transmission: one is clear transparent paint, and another kind is dumb light paint.Passivation technology often adopts Cr VI passivation, in this flow process, can produce a large amount of waste water and heavy metal ion, such as hexavalent chromium can produce harm to environment, the mankind, due to needs electro-coppering, can cause the corrosion resistance of surface-treated layer poor, conventionally solution is that the thickness that increases electronickelling promotes corrosion resistance, but corresponding meeting promotes production cost, causes nickel resources waste.
Chinese patent 201220188606 discloses a kind of ABS plastic surface plating structure with wire-drawing effect, and this structure comprises ABS plastic surface, electroless nickel layer, alkaline copper plating layer, wire drawing electroless nickel layer and electrodeposited chromium layers from inside to outside successively.
Zhang Hua (China. Environmental Technology periodical, 2013 04 month) automobile plastic ornament electroplating technology and Performance Detection thereof are disclosed, in this article, describe the effect of electro-coppering in detail: copper has good ductility, pliability, compared with the thermal coefficient of expansion of other coating closer to plastics.At the level and smooth and pliable and tough copper layer of thick approximately 15～25 μ m of plastic part plated surface last layer, be conducive to increase adhesion, temp. variation resistant ability and the corrosion resistance of part and whole coating, be subject to when ambient temperature changes or impacts playing a cushioning effect at part, reduce the part extent of damage.Visible electro-coppering is indispensable part in current plastic electroplating operation, and its major function is the part stress that increases the adhesion between follow-up electrodeposited coating and plastics and reduce nickel dam.
There is following problem in electroplating in existing ABS plastic cement, as needs electro-coppering, due to needs electro-coppering, can cause the corrosion resistance of surface-treated layer poor, conventionally solution is that the thickness that increases electronickelling promotes corrosion resistance, but corresponding meeting promotes production cost, causes nickel resources waste.
Summary of the invention
The object of the invention is to the problems referred to above that exist in electroplating for existing ABS plastic cement, provide and can shorten the technological process of production that ABS plastic part is electroplated, a kind of ABS plastic face coat and the preparation method of saving resource.
Described ABS plastic face coat, its structure starts to be followed successively by from ABS plastic layer, and 1) electroless nickel layer, thickness is 0.05～0.5 μ m, 2) impact nickel dam, thickness is 1～3 μ m, 3) and half light nickel dam, thickness is 3～8 μ m, 4) and organic coating, thickness is 10～20 μ m.
The preparation method of described ABS plastic face coat, comprises the following steps:
1) pre-treatment of ABS plastic: electrochemical deoiling → alligatoring → neutralization → catalysis → dispergation → plating electroless nickel layer;
2) in electroless nickel layer, impacting nickel electroplates to obtain and impacts re-plating half light nickel dam after nickel dam;
3) on half light nickel dam, carry out wire drawing processing;
4) wire drawing ABS plastic plated item after treatment carries out hydrocarbon vacuum oil removing and drying and processing;
5) on step 4) ABS plastic plated item after treatment, be coated with organic coating.
In step 1), the pre-treatment of described ABS plastic is carried out according to current known processing mode.
In step 2) in, described in impact nickel electroplate, adopt known impact nickel formula to electroplate; Described plating half light nickel dam, adopts known half light nickel formula to electroplate.
In step 3), described wire drawing processing, can adopt automatic or artificial wire drawing mode to carry out wire drawing, and the rotating speed of wire drawing machine is 600～1200r/min; Pulling wheel can be at least one in nylon wheel, all-wing aircraft wheel etc.
In step 4), described hydrocarbon vacuum oil removing and drying and processing, can carry out hydrocarbon vacuum oil removing and drying and processing by being suspended on ABS plastic plated item after treatment wire drawing on spray-paint suspension tool, and the oil removing time is 3～8min, and drying time is 5～10min.
In step 5), described in be coated with organic coating, ABS plastic plated item after treatment step 4) directly can be hung on spraying hanging tool and carries out spray treatment, be coated with organic coating; Described organic coating can adopt at least one in ultraviolet light polymerization (UV) paint, polyurethane (PU) paint etc.; Spraying method is method known in those skilled in the art.
Advantage of the present invention is:
Simplify the spray paint technological process of production of product of existing electronickelling wire drawing, broken ABS plastic and must adopt in electroplating the inherent limitations of electro-coppering operation.Meanwhile, owing to there is no copper layer in superficial layer, therefore can reduce the thickness of original nickel dam and (be down to 3～6 μ m) from original 15～20 μ m, saved metals resources, not only shortened process, and can significantly reducing production costs.
The specific embodiment
The present invention is further illustrated for following examples.
Embodiment 1:
A kind of ABS plastic face coat, its structure starts to be followed successively by from ABS plastic layer, and 1) electroless nickel layer, thickness is 0.05 μ m, 2) impact nickel dam, thickness is 3 μ m, 3) half light nickel dam, thickness is 3 μ m, 4) organic coating, thickness is 20 μ m.
Below provide a kind of preparation method of ABS plastic face coat:
The pre-treatment of first step ABS plastic: electrochemical deoiling → alligatoring → neutralization → catalysis → dispergation → chemical nickel; This technological process is carried out according to conventional treatment process in industry, and chemical nickel thickness of coating is 0.05 μ m.
Second step ABS plastic is electroplated: after the pre-treatment of the ABS plastic first step, impact nickel plating → semi-bright nickel; Impact nickel and electroplate, adopt known impact nickel formula to electroplate, the THICKNESS CONTROL of impacting nickel is 3 μ m, and then carries out half light nickel and electroplate, and adopts known half light nickel formula to electroplate, and the THICKNESS CONTROL of half light nickel is at 3 μ m.To meet wire drawing thickness requirement.
The 3rd step ABS plastic electroless nickel layer carries out wire drawing processing: ABS plastic second step carries out wire drawing processing after electroplating; Can adopt automatic or artificial wire drawing mode to carry out wire drawing, the rotating speed of wire drawing machine is 1200r/min; Pulling wheel can be nylon wheel.
The 4th step wire drawing ABS plastic plated item after treatment carries out hydrocarbon vacuum oil removing and drying and processing; Carry out hydrocarbon vacuum oil removing and drying and processing by being suspended on product on PVD plated film hanger, the oil removing time is 3min, drying time 5min.
In the 5th step: the 4th step ABS plastic plated item after treatment is directly hung on spraying hanging tool and carried out spray treatment, spraying polyurethane (PU) paints transparent organic coating, spraying method is that automatic spray gun known in those skilled in the art sprays, on coating-spraying line, automatically carry out, after spraying, by chain, ABS plastic spray piece is sent into infrared ray baker, the rete levelling that sprays paint (60 ℃ × 10min), oven dry (60 ℃ × 60min).Thereby the thickness that obtains organic enamelled coating can be 20 μ m.
Carry out following test according to sanitary ware industry standard:
A.CASS (anti corrosion test ASTM B368-09)-----8h;
B.AASS (salt spray test ASTM G85-9)--------48h
C.-40 ℃ to 75 ℃ (ASME A112.18.1-2005/CSA B125.1-05) of cold cycling test---8 circulations;
Test result is all passed through.
Embodiment 2:
A kind of ABS plastic face coat, its structure starts to be followed successively by from ABS plastic layer, and 1) electroless nickel layer, thickness is 0.5 μ m, 2) impact nickel dam, thickness is 1 μ m, 3) half light nickel dam, thickness is 8 μ m, 4) organic coating, thickness is 10 μ m.
Below provide a kind of preparation method of ABS plastic face coat:
The pre-treatment of first step ABS plastic: electrochemical deoiling → alligatoring → neutralization → catalysis → dispergation → chemical nickel; This technological process is carried out according to conventional treatment process in industry, and chemical nickel thickness of coating is 0.5 μ m.
Second step ABS plastic is electroplated: after the pre-treatment of the ABS plastic first step, impact nickel plating → semi-bright nickel; Impact nickel and electroplate, adopt known impact nickel formula to electroplate, the THICKNESS CONTROL of impacting nickel is 3 μ m, and then carries out half light nickel and electroplate, and adopts known half light nickel formula to electroplate, and the THICKNESS CONTROL of half light nickel is at 8 μ m.To meet wire drawing thickness requirement.
The 3rd step ABS plastic electroless nickel layer carries out wire drawing processing: ABS plastic second step carries out wire drawing processing after electroplating; Can adopt automatic or artificial wire drawing mode to carry out wire drawing, the rotating speed of wire drawing machine is 600r/min; Pulling wheel can be all-wing aircraft wheel.
The 4th step wire drawing ABS plastic plated item after treatment carries out hydrocarbon vacuum oil removing and drying and processing; Carry out hydrocarbon vacuum oil removing and drying and processing by being suspended on product on PVD plated film hanger, the oil removing time is 8min, drying time 10min.
In the 5th step: the 4th step ABS plastic plated item after treatment is directly hung on spraying hanging tool and carried out spray treatment, spraying ultraviolet light polymerization (UV) paint dumb light organic coating, spraying method is that automatic spray gun known in those skilled in the art sprays, on coating-spraying line, automatically carry out, after spraying, by chain, ABS plastic spray piece is sent into infrared ray baker, spray paint rete levelling, oven dry (60 ℃ × 10min), the rete that sprays paint after levelling accepts to irradiate curing cross-linked (10 seconds time) in ultraviolet photo-curing stove.Thereby the thickness that obtains organic enamelled coating can be 10 μ m.
Carry out following test according to sanitary ware industry standard:
A, CASS (anti corrosion test ASTM B368-09)-----8h;
B, AASS (salt spray test ASTM G85-9)--------48h
C ,-40 ℃ to 75 ℃ (ASME A112.18.1-2005/CSA B125.1-05) of cold cycling test---8 circulations;
Test result is all passed through.
Embodiment 3:
A kind of ABS plastic face coat, its structure starts to be followed successively by from ABS plastic layer, and 1) electroless nickel layer, thickness is 0.2 μ m, 2) impact nickel dam, thickness is 1.5 μ m, 3) half light nickel dam, thickness is 5 μ m, 4) organic coating, thickness is 15 μ m.
Below provide a kind of preparation method of ABS plastic face coat:
The pre-treatment of first step ABS plastic: electrochemical deoiling → alligatoring → neutralization → catalysis → dispergation → chemical nickel; This technological process is carried out according to conventional treatment process in industry, and chemical nickel thickness of coating is 0.2 μ m.
Second step ABS plastic is electroplated: after the pre-treatment of the ABS plastic first step, impact nickel plating → semi-bright nickel; Impact nickel and electroplate, adopt known impact nickel formula to electroplate, the THICKNESS CONTROL of impacting nickel is 1.5 μ m, and then carries out half light nickel and electroplate, and adopts known half light nickel formula to electroplate, and the THICKNESS CONTROL of half light nickel is at 5 μ m.To meet wire drawing thickness requirement.
The 3rd step ABS plastic electroless nickel layer carries out wire drawing processing: ABS plastic second step carries out wire drawing processing after electroplating; Can adopt automatic or artificial wire drawing mode to carry out wire drawing, the rotating speed of wire drawing machine is 800r/min; Pulling wheel can be nylon wheel.
The 4th step wire drawing ABS plastic plated item after treatment carries out hydrocarbon vacuum oil removing and drying and processing; Carry out hydrocarbon vacuum oil removing and drying and processing by being suspended on product on PVD plated film hanger, the oil removing time is 5min, and drying time is asked 8min.
In the 5th step: the 4th step ABS plastic plated item after treatment is directly hung on spraying hanging tool and carried out spray treatment, spraying polyurethane (PU) paint dumb light organic coating, spraying method is that automatic spray gun known in those skilled in the art sprays, on coating-spraying line, automatically carry out, after spraying, by chain, ABS plastic spray piece is sent into infrared ray baker, the rete levelling that sprays paint (60 ℃ × 10min), oven dry (60 ℃ × 60min).Thereby the thickness that obtains organic enamelled coating can be 15 μ m.
Carry out following test according to sanitary ware industry standard:
A, CASS (anti corrosion test ASTM B368-09)-----8h;
B, AASS (salt spray test ASTM G85-9)--------48h
C ,-40 ℃ to 75 ℃ (ASME A112.18.1-2005/CSA B125.1-05) of cold cycling test---8 circulations;
Test result is all passed through.
Claims (6)
1. an ABS plastic face coat, is characterized in that its structure starts to be followed successively by from ABS plastic layer, 1) electroless nickel layer, thickness is 0.05～0.5 μ m, 2) impact nickel dam, thickness is 1～3 μ m, 3) and half light nickel dam, thickness is 3～8 μ m, 4) and organic coating, thickness is 10～20 μ m.
2. a kind of preparation method of ABS plastic face coat as claimed in claim 1, is characterized in that comprising the following steps:
1) pre-treatment of ABS plastic: electrochemical deoiling → alligatoring → neutralization → catalysis → dispergation → plating electroless nickel layer;
2) in electroless nickel layer, impacting nickel electroplates to obtain and impacts re-plating half light nickel dam after nickel dam;
3) on half light nickel dam, carry out wire drawing processing;
4) wire drawing ABS plastic plated item after treatment carries out hydrocarbon vacuum oil removing and drying and processing;
5) on step 4) ABS plastic plated item after treatment, be coated with organic coating.
3. a kind of preparation method of ABS plastic face coat as claimed in claim 2, is characterized in that in step 3), described wire drawing processing, adopts automatic or artificial wire drawing mode to carry out wire drawing, and the rotating speed of wire drawing machine is 600～1200r/min; Pulling wheel is at least one in nylon wheel, all-wing aircraft wheel.
4. a kind of preparation method of ABS plastic face coat as claimed in claim 2, it is characterized in that in step 4), described hydrocarbon vacuum oil removing and drying and processing, on spray-paint suspension tool, to carry out hydrocarbon vacuum oil removing and drying and processing by being suspended on ABS plastic plated item after treatment wire drawing, the oil removing time is 3～8min, and drying time is 5～10min.
5. a kind of preparation method of ABS plastic face coat as claimed in claim 2, it is characterized in that in step 5), the described organic coating that is coated with, is that ABS plastic plated item after treatment step 4) is directly hung on spraying hanging tool and carries out spray treatment, is coated with organic coating.
6. a kind of preparation method of ABS plastic face coat as claimed in claim 2, is characterized in that in step 5), and described organic coating adopts at least one in ultraviolet-cured paint, polyurethane paint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410072494.4A CN103786386B (en) | 2014-02-28 | 2014-02-28 | A kind of ABS plastic face coat and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410072494.4A CN103786386B (en) | 2014-02-28 | 2014-02-28 | A kind of ABS plastic face coat and preparation method thereof |
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| Publication Number | Publication Date |
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| CN103786386A true CN103786386A (en) | 2014-05-14 |
| CN103786386B CN103786386B (en) | 2016-08-17 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106111426A (en) * | 2016-08-29 | 2016-11-16 | 永康市恒久涂装设备有限公司 | A kind of ABS plastic profiled member finishing system |
| CN106939433A (en) * | 2017-03-13 | 2017-07-11 | 科世达（上海）管理有限公司 | A kind of plastic part surface processing method |
| CN112226770A (en) * | 2020-09-27 | 2021-01-15 | 歌尔股份有限公司 | Method for plating black nickel on metal substrate |
| CN116623136A (en) * | 2023-04-20 | 2023-08-22 | 鑫泽晟科技有限公司 | Coating method of ABS plastic plug cover of refrigerator |
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| US4576685A (en) * | 1985-04-23 | 1986-03-18 | Schering Ag | Process and apparatus for plating onto articles |
| CN101748457A (en) * | 2010-01-20 | 2010-06-23 | 大连华辰电镀有限公司 | Non-cyanide and lead-free nickelic chromium plating technology |
| CN102703935A (en) * | 2012-06-12 | 2012-10-03 | 宁波华楷汽车零部件有限公司 | Novel electroplating solution for microcrack nickel electroplating and plastic part electroplating technology adopting electroplating solution |
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2014
- 2014-02-28 CN CN201410072494.4A patent/CN103786386B/en not_active Expired - Fee Related
Patent Citations (3)
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|---|---|---|---|---|
| US4576685A (en) * | 1985-04-23 | 1986-03-18 | Schering Ag | Process and apparatus for plating onto articles |
| CN101748457A (en) * | 2010-01-20 | 2010-06-23 | 大连华辰电镀有限公司 | Non-cyanide and lead-free nickelic chromium plating technology |
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| 未知: "《乐思化学塑胶镀工艺介绍》", 26 December 2012 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106111426A (en) * | 2016-08-29 | 2016-11-16 | 永康市恒久涂装设备有限公司 | A kind of ABS plastic profiled member finishing system |
| CN106939433A (en) * | 2017-03-13 | 2017-07-11 | 科世达（上海）管理有限公司 | A kind of plastic part surface processing method |
| CN106939433B (en) * | 2017-03-13 | 2019-10-15 | 科世达（上海）管理有限公司 | A kind of plastic part surface processing method |
| CN112226770A (en) * | 2020-09-27 | 2021-01-15 | 歌尔股份有限公司 | Method for plating black nickel on metal substrate |
| CN112226770B (en) * | 2020-09-27 | 2023-04-25 | 歌尔股份有限公司 | Method for plating black nickel on metal substrate |
| CN116623136A (en) * | 2023-04-20 | 2023-08-22 | 鑫泽晟科技有限公司 | Coating method of ABS plastic plug cover of refrigerator |
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| CN103786386B (en) | 2016-08-17 |
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