CN220887721U - Coating structure of barrel plating gun color tin cobalt alloy - Google Patents
Coating structure of barrel plating gun color tin cobalt alloy Download PDFInfo
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- CN220887721U CN220887721U CN202321867828.8U CN202321867828U CN220887721U CN 220887721 U CN220887721 U CN 220887721U CN 202321867828 U CN202321867828 U CN 202321867828U CN 220887721 U CN220887721 U CN 220887721U
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- 238000007747 plating Methods 0.000 title claims abstract 28
- 229910000531 Co alloy Inorganic materials 0.000 title claims abstract 10
- WDHWFGNRFMPTQS-UHFFFAOYSA-N cobalt tin Chemical compound [Co].[Sn] WDHWFGNRFMPTQS-UHFFFAOYSA-N 0.000 title claims abstract 10
- 239000011248 coating agent Substances 0.000 title abstract 2
- 238000000576 coating method Methods 0.000 title abstract 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract 6
- 239000000758 substrate Substances 0.000 claims abstract 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract 4
- 229910001297 Zn alloy Inorganic materials 0.000 claims abstract 4
- 229910052802 copper Inorganic materials 0.000 claims abstract 4
- 239000010949 copper Substances 0.000 claims abstract 4
- 238000004512 die casting Methods 0.000 claims abstract 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract 3
- 229910021389 graphene Inorganic materials 0.000 claims abstract 3
- 229910052759 nickel Inorganic materials 0.000 claims abstract 3
- 238000007789 sealing Methods 0.000 claims abstract 3
- 238000000034 method Methods 0.000 claims abstract 2
- BQVVSSAWECGTRN-UHFFFAOYSA-L copper;dithiocyanate Chemical compound [Cu+2].[S-]C#N.[S-]C#N BQVVSSAWECGTRN-UHFFFAOYSA-L 0.000 claims 1
- 230000007797 corrosion Effects 0.000 abstract 2
- 238000005260 corrosion Methods 0.000 abstract 2
- 239000002184 metal Substances 0.000 abstract 2
- 229910052751 metal Inorganic materials 0.000 abstract 2
- 150000003839 salts Chemical class 0.000 abstract 2
- 239000007921 spray Substances 0.000 abstract 2
- 230000005587 bubbling Effects 0.000 abstract 1
- 239000003518 caustics Substances 0.000 abstract 1
- 238000005234 chemical deposition Methods 0.000 abstract 1
- 238000004070 electrodeposition Methods 0.000 abstract 1
- 230000007935 neutral effect Effects 0.000 abstract 1
- 230000035939 shock Effects 0.000 abstract 1
- 238000010998 test method Methods 0.000 abstract 1
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- Electroplating Methods And Accessories (AREA)
Abstract
The utility model discloses a plating structure of barrel plating gun color tin cobalt alloy, which comprises a zinc alloy die casting substrate, and a cyanide-free copper plating layer, a bright nickel plating layer, a gun color tin cobalt alloy plating layer and a graphene sealing layer which are sequentially prepared on the zinc alloy die casting substrate from inside to outside. The utility model discloses a plating layer structure of a barrel plating gun color tin cobalt alloy, which tests the bonding force of a plating layer by a thermal shock method according to GB/T5270-2005 'test method for the adhesion strength of a metal coating electro-deposition layer and a chemical deposition layer on a metal substrate', wherein the bonding force of the plating layer meets the standard requirement without bubbling and falling. According to GB/T10125-2021 salt spray test for artificial atmosphere corrosion test, the neutral salt spray test is carried out for 108h, no corrosive substances are generated on the surface of a plating part, and the plating layer has good corrosion resistance.
Description
Technical Field
The utility model belongs to the technical field of metal surface treatment, and particularly relates to a plating layer structure of a barrel plating gun color tin-cobalt alloy.
Background
The tin-cobalt alloy gun color coating has elegant appearance and is widely applied to the preparation of decorative coatings of accessories such as jewelry, clocks, glasses and the like. In the past, the process of rolling tin-cobalt alloy gun color coating on the surface of zinc alloy die castings is generally to sequentially prepare a cyanide copper plating layer, a bright nickel coating layer, a tin-cobalt alloy gun color coating layer and a post-treatment protective film on the surface of the zinc alloy die castings. Under the condition that cyanide is controlled, a novel process for rolling a tin-cobalt alloy gun color coating on the surface of a zinc alloy die casting comprises the steps of sequentially preparing a citrate pre-nickel coating, a bright nickel coating, a tin-cobalt alloy gun color coating and a post-treatment protective film on the surface of the zinc alloy die casting. The nickel plating layer and the tin-cobalt alloy plating layer are both cathode plating layers relative to the zinc alloy substrate, and when the plating layers are damaged, primary cell corrosion occurs to quickly damage the zinc alloy die casting substrate, or corrosion medium corrodes the zinc alloy die casting substrate along the plating layer pores, so that the corrosion resistance of the plating layer structure is not ideal.
The use of cyanide-free copper plating instead of cyanide copper plating is a hotspot studied in the industry, and at present, some processes for directly performing cyanide-free copper plating on a zinc alloy die casting substrate have been put into production, but the problem of low binding force of a plating layer is still not completely solved [1]. The latest developed copper plating process of the polymeric thiocyanate in the industry uses the polymeric cuprous thiocyanate as a main salt and uses the polymeric sodium thiocyanate as a complexing agent, the performance of the copper plating process is relatively close to that of cyanide copper plating, and the copper plating process is a cyanide-free copper plating process which is hopeful to replace cyanide copper plating.
The tin-cobalt alloy gun color coating needs post-treatment protection to increase corrosion resistance, and conventionally adopts chromate electrolysis protection or chromic acid passivation protection [2]. The traditional process has the problem of high pollution of hexavalent chromium, so that the research of developing the environment-friendly post-treatment protection process for the color coating of the tin-cobalt alloy gun has important significance.
Reference is made to: [1] qin Zuzu, li Jiansan, xu Jinlai, national and international cyanide-free copper plating process research progress [ J ], electroplating and finishing, 2015, 34 (3): 149-152. [2] Zhang Jingshuang, tu Zhenmi, an Maozhong, etc., research and application of tin-cobalt alloy gun color coating [ J ], electroplating and environmental protection, 2001, 21 (1): 4-8.
Disclosure of Invention
In order to solve the problem of high pollution in the process of plating the gun-shaped tin-cobalt alloy of the traditional zinc alloy die casting, the utility model provides a plating structure of the gun-shaped tin-cobalt alloy of barrel plating. In order to achieve the above purpose, the utility model adopts the following technical scheme:
A plating layer structure of a barrel plating gun color tin cobalt alloy comprises: the zinc alloy die casting comprises a zinc alloy die casting substrate, and a cyanide-free copper plating layer, a bright nickel plating layer, a gun-color tin-cobalt alloy plating layer and a graphene sealing layer which are sequentially prepared on the zinc alloy die casting substrate from inside to outside;
The cyanide-free copper plating layer is prepared by adopting a polymerized thiocyanate copper plating process;
The thickness of the cyanide-free copper plating layer is 4-10 mu m.
Preferably, the thickness of the bright nickel plating layer is 6-13 μm.
Preferably, the thickness of the gun-color tin-cobalt alloy coating is 0.5-2 mu m.
Preferably, the thickness of the graphene sealing layer is 0.7-1.2 μm.
Compared with the prior art, the utility model has the following beneficial effects:
1. The plating structure of the barrel plating gun color tin cobalt alloy disclosed by the utility model overcomes the high pollution problem of copper plating on a zinc alloy die casting substrate by adopting a cyanide copper plating process;
2. The utility model discloses a plating structure of barrel plating gun color tin-cobalt alloy, which solves the problem of high pollution caused by preparing a protective film on a gun color tin-cobalt alloy plating layer by adopting a chromic acid passivation process.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and constitute a part of this specification, are incorporated in and constitute a part of this specification and do not limit the utility model in any way, and in which:
Fig. 1 is a schematic diagram of the plating structure of examples 1 and 2 of the present utility model.
Description of the embodiments
The present utility model will now be described in detail with reference to the drawings and the specific embodiments thereof, wherein the exemplary embodiments and descriptions of the present utility model are provided for illustration of the utility model and are not intended to be limiting.
A plating layer structure of barrel plating gun color tin cobalt alloy comprises a zinc alloy die casting substrate, and a cyanide-free copper plating layer, a bright nickel plating layer, a gun color tin cobalt alloy plating layer and a graphene sealing layer which are sequentially prepared on the zinc alloy die casting substrate from inside to outside.
And (3) carrying out oil removal, rust removal and activation treatment on the zinc alloy die casting substrate according to the existing pretreatment process.
And preparing a cyanide-free copper plating layer on the pretreated zinc alloy die casting by adopting a polymeric thiocyanate copper rolling plating process.
Preferably, the thickness of the cyanide-free copper plating layer is 4 to 10 μm.
Preferably, the cyanide-free copper plating layer is prepared by adopting HT-810 polymeric thiocyanate barrel copper plating technology of Zunyi electroplating materials Co., ltd.):
17-23 g/L of polymerized cuprous thiocyanate, 100-160 g/L of polymerized sodium thiocyanate, 8-12 g/L of potassium sodium tartrate, 1-2 mL/L of HT-810 brightening agent, 2-4 mL/L of HT-810 plating solution, 45-55 ℃ of plating bath temperature, 12-13 of plating bath pH range, 5-8V of plating bath voltage and 8-12 r/min of rotary drum rotating speed, and an anaerobic electrolytic copper corner (or copper particle) is used as an anode.
The cyanide-free copper plating layer of the zinc alloy die casting is prepared into a bright nickel plating layer by adopting the current barrel plating bright nickel technology.
Preferably, the thickness of the bright nickel plating layer is 6-13 μm.
The gun-color tin-cobalt alloy coating is prepared on the bright nickel coating of the zinc alloy die casting by adopting the current barrel plating gun-color tin-cobalt combination process.
Preferably, the thickness of the gun-color tin-cobalt alloy coating is 0.5-2 mu m.
Preferably, the gun color tin cobalt alloy coating is prepared by adopting an SCA 422 nickel-free gun color barrel plating process in super-bonding chemical industry:
230-320 g/L of SCA-421 conductive salt, 4-9 g/L of SCA-424S tin salt, 45-85 mL/L of SCA-423C cobalt water, 100-140 mL/L of SCA-422A additive, 20-40 mL/L of SCA-422B additive, 6-10V of plating bath voltage, 25-50 ℃ of plating bath temperature, 8.5-9.5 of plating bath pH range and 3-5 r/min of drum rotating speed, and graphite plates are used as anodes.
And preparing a graphene sealing layer on the gun-color tin cobalt alloy of the zinc alloy die casting.
Preferably, the thickness of the graphene sealing layer is 0.7-1.2 μm.
Preferably, the graphene sealing layer is prepared by adopting PRODICO 480,480 graphene sealing technology in super-bonding chemical industry:
Adding water to dilute PRODICO 480 graphene sealing agent to 2.5-3.5 times to prepare sealing liquid, immersing the plating piece in the sealing liquid for 5-15 s, taking out of the tank, dehydrating and spin-drying by using a centrifuge, and then drying and curing at 70-90 ℃ for 20-30 min.
Examples
As shown in fig. 1, the plating structure of the barrel plating gun color tin cobalt alloy comprises a zinc alloy die casting substrate 1, and a cyanide-free copper plating layer 2, a bright nickel plating layer 3, a gun color tin cobalt alloy plating layer 4 and a graphene sealing layer 5 which are sequentially prepared on the zinc alloy die casting substrate 1 from inside to outside.
1. Pretreatment:
the zinc alloy die casting substrate 1 is subjected to chemical paraffin removal, water washing, ultrasonic paraffin removal, water washing, chemical degreasing, water washing, ultrasonic degreasing, water washing, acid salt activation and water washing.
2. Cyanide-free barrel-plating copper:
The cyanide-free copper plating layer 2 is prepared on the pretreated zinc alloy die casting by adopting an HT-810 polymeric thiocyanate copper rolling plating process which is in compliance with the electric plating material limited company, and the thickness of the copper plating layer is 6 mu m.
19G/L of polymerized cuprous thiocyanate, 120g/L of polymerized sodium thiocyanate, 10g/L of potassium sodium tartrate, 1.5mL/L of HT-810 brightening agent, 3mL/L of HT-810 locating agent, 50 ℃ of plating bath temperature, 12.5 pH of plating solution, 6V of plating bath voltage and 10r/min of rotary drum rotating speed, and an anaerobic electrolytic copper corner is used as an anode.
3. Barrel plating bright nickel:
The bright nickel plating layer 3 is prepared on the cyanide-free copper plating of the zinc alloy die casting by adopting the current barrel plating bright nickel technology, and the thickness of the plating layer is 12 mu m.
4. Barrel plating gun color tin cobalt alloy:
The SCA 422 nickel-free gun color barrel plating process of the super-bonding chemical industry is adopted on the bright nickel plating layer of the zinc alloy die casting to prepare a gun color tin cobalt alloy plating layer 4, and the thickness of the plating layer is 1 mu m.
The method comprises the steps of (1) carrying out SCA-421 conductive salt 260g/L, SCA-424S tin salt 5g/L, SCA-423C cobalt water 60mL/L, SCA-422A additive 110mL/L, SCA-422B additive 25mL/L, plating bath voltage 7V, plating bath temperature 30 ℃, plating bath pH of 9 and drum rotating speed 4r/min, and taking a graphite plate as an anode.
5. And (3) graphene sealing:
And preparing a graphene sealing layer 5 on the gun-color tin cobalt alloy coating of the zinc alloy die casting by adopting a PRODICO and 480 graphene sealing process in super-bonding chemical industry, wherein the thickness of the sealing layer is 0.8 mu m.
Adding water to dilute PRODICO 480,480 graphene sealing agent to 3 times to prepare sealing liquid, immersing the plating part in the sealing liquid for 10s, taking out of the tank, dehydrating and spin-drying by a centrifuge, and drying and curing at 80 ℃ for 30min.
Examples
As shown in fig. 1, the plating structure of the barrel plating gun color tin cobalt alloy comprises a zinc alloy die casting substrate 1, and a cyanide-free copper plating layer 2, a bright nickel plating layer 3, a gun color tin cobalt alloy plating layer 4 and a graphene sealing layer 5 which are sequentially prepared on the zinc alloy die casting substrate 1 from inside to outside.
1. Pretreatment:
the zinc alloy die casting substrate 1 is subjected to chemical paraffin removal, water washing, ultrasonic paraffin removal, water washing, chemical degreasing, water washing, ultrasonic degreasing, water washing, acid salt activation and water washing.
2. Cyanide-free barrel-plating copper:
The cyanide-free copper plating layer 2 is prepared on the pretreated zinc alloy die casting by adopting an HT-810 polymeric thiocyanate copper rolling plating process which is in compliance with the electric plating materials limited company, and the thickness of the plating layer is 8 mu m.
22G/L of polymerized cuprous thiocyanate, 150g/L of polymerized sodium thiocyanate, 10g/L of potassium sodium tartrate, 1.5mL/L of HT-810 brightening agent, 3mL/L of HT-810 positioning agent, 53 ℃ of plating bath temperature, 12.8 of plating bath pH, 6V of plating bath voltage and 10r/min of rotary drum rotating speed, and anaerobic electrolytic copper particles are used as anodes.
3. Barrel plating bright nickel:
The bright nickel plating layer 3 is prepared on the cyanide-free copper plating layer of the zinc alloy die casting by adopting the current barrel plating bright nickel technology, and the thickness of the plating layer is 10 mu m.
4. Barrel plating gun color tin cobalt alloy:
The SCA 422 nickel-free gun color barrel plating process of the super-bonding chemical industry is adopted on the bright nickel plating layer of the zinc alloy die casting to prepare a gun color tin cobalt alloy plating layer 4, and the thickness of the plating layer is 1 mu m.
300G/L of SCA-421 conductive salt, 8g/L of SCA-424S tin salt, 75mL/L of SCA-423C cobalt water, 130mL/L of SCA-422A additive, 35mL/L of SCA-422B additive, 8 plating bath voltage, 40 ℃ plating bath temperature, 9.2 plating bath pH and 4r/min drum rotation speed, and graphite plates are used as anodes.
5. And (3) graphene sealing:
And preparing a graphene sealing layer 5 on the gun-color tin cobalt alloy coating of the zinc alloy die casting by adopting a PRODICO and 480 graphene sealing process in super-bonding chemical industry, wherein the thickness of the sealing layer is 0.8 mu m.
Adding water to dilute PRODICO 480,480 graphene sealing agent to 3 times to prepare sealing liquid, immersing the plating part in the sealing liquid for 8s, taking out of the groove, dehydrating and spin-drying by a centrifugal machine, and drying and curing at 90 ℃ for 20min.
Test example 1:
Cyanide-free copper plating, bright nickel plating, gun-color tin-cobalt alloy plating and graphene sealing layers were prepared on zinc alloy die castings in sequence from inside to outside according to the processes of example 1 and example 2. According to GB/T5270-2005 'test method for electrodepositing metallic coating on metallic substrate and adhesive strength of chemical deposition layer', the binding force of the coating is tested by thermal shock method, the coating is heated to 150 ℃ in a heating furnace and kept for 30min, and then taken out and put into water at room temperature for rapid cooling, and the coating is free from foaming and falling. Experiments show that the coating structure prepared by the embodiment has good binding force.
Test example 2:
Cyanide-free copper plating, bright nickel plating, gun-color tin-cobalt alloy plating and graphene sealing layers are sequentially prepared on the zinc alloy die casting substrate from inside to outside according to the process of the embodiment 1 and the embodiment 2. According to GB/T10125-2021 salt spray test for artificial atmosphere corrosion test, the surface of a neutral salt spray test 108h plating part is free from corrosion, which is higher than the requirement of ISO 26945:2011 standard.
Comparative example 1:
Cyanide-free copper plating, bright nickel plating, gun-color tin-cobalt alloy plating, and then electrolytic protective films were prepared according to the conventional chromic acid passivation process were sequentially prepared on the zinc alloy die castings according to the process of example 1 and example 2 from inside to outside. According to GB/T10125-2021 salt spray test for artificial atmosphere corrosion test, a neutral salt spray test is carried out for 72h, and grey-white corrosive substances appear on the surface of a plated part. Experiments show that the corrosion resistance of the graphene sealing layer prepared by adopting the graphene sealing agent is obviously higher than that of the traditional chromic acid passivation protective film.
The foregoing has outlined the detailed description of the embodiments of the present utility model, and the detailed description of the embodiments and the embodiments of the present utility model has been provided herein by way of illustration of specific examples, which are intended to be merely illustrative of the principles of the embodiments of the present utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which shall fall within the scope of the utility model.
Claims (4)
1. The plating structure of the barrel plating gun color tin cobalt alloy is characterized by comprising a zinc alloy die casting substrate, and a cyanide-free copper plating layer, a bright nickel plating layer, a gun color tin cobalt alloy plating layer and a graphene sealing layer which are sequentially prepared on the zinc alloy die casting substrate from inside to outside;
The cyanide-free copper plating is prepared by adopting a polymerized thiocyanate copper plating process;
The thickness of the cyanide-free copper plating layer is 4-10 mu m.
2. The plating structure of the barrel plating gun color tin cobalt alloy according to claim 1, wherein the thickness of the bright nickel plating layer is 6-13 μm.
3. The plating structure of the barrel plating gun color tin-cobalt alloy according to claim 1, wherein the thickness of the gun color tin-cobalt alloy plating layer is 0.5-2 μm.
4. The plating structure of the barrel plating gun color tin cobalt alloy according to claim 1, wherein the thickness of the graphene sealing layer is 0.7-1.2 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321867828.8U CN220887721U (en) | 2023-07-17 | 2023-07-17 | Coating structure of barrel plating gun color tin cobalt alloy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321867828.8U CN220887721U (en) | 2023-07-17 | 2023-07-17 | Coating structure of barrel plating gun color tin cobalt alloy |
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| CN220887721U true CN220887721U (en) | 2024-05-03 |
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| CN202321867828.8U Active CN220887721U (en) | 2023-07-17 | 2023-07-17 | Coating structure of barrel plating gun color tin cobalt alloy |
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