CN212640613U - Coating structure for plating gold-cobalt alloy on zinc alloy die casting - Google Patents
Coating structure for plating gold-cobalt alloy on zinc alloy die casting Download PDFInfo
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- CN212640613U CN212640613U CN202020308748.9U CN202020308748U CN212640613U CN 212640613 U CN212640613 U CN 212640613U CN 202020308748 U CN202020308748 U CN 202020308748U CN 212640613 U CN212640613 U CN 212640613U
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Abstract
The utility model discloses a zinc alloy die casting gold cobalt alloy's cladding material structure, including the zinc alloy base member and with alkaline zinc-nickel alloy cladding material, chemical nickel coating, pyrophosphate copper plate, acid copper cladding material, bright nickel cladding material, gold cobalt alloy cladding material that prepare in proper order from inside to outside on the zinc alloy base member. The utility model discloses a gold cobalt alloy cladding material structure, preparation technology environmental protection carries out neutral salt fog test 120 hours according to GB/T10125 + 2012 "artificial atmosphere corrosion test salt fog test", and the piece surface that plates does not have the corrosive substance and generates, has good corrosion resistance.
Description
Technical Field
The utility model belongs to the metal plating field, concretely relates to coating structure of zinc alloy die casting gold cobalt alloy plating.
Background
The plating layer prepared by the acid gold-cobalt alloy electroplating process has luxurious and elegant appearance, the color is higher than 23K, the color is stabilized at about 3N, the plating layer is bright and high in wear resistance, and the acid gold-cobalt alloy electroplating process is widely used as the plating layer of high-end ornaments.
The traditional process for electroplating acidic gold-cobalt alloy on the zinc alloy die casting comprises the following steps: cyanide copper plating, pyrophosphate copper plating, acid copper plating, bright nickel plating, nickel-phosphorus alloy plating and gold-cobalt alloy plating.
The zinc alloy die casting surface has more pores, and the coating prepared by the traditional process cannot effectively eliminate the pores on the surface of the matrix of the plated part, so that the corrosion resistance of the coating is poor.
The zinc alloy die casting adopts a cyanide copper plating process to prepare the bottom copper layer, and the cyanide is extremely toxic, so that the zinc alloy die casting does not conform to the industrial policy set by the national development and modification commission.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that the gold-cobalt alloy plating layer of the zinc alloy die casting is low in corrosion resistance and high in toxicity in use for cyanide copper plating, the utility model provides a plating layer structure for plating gold-cobalt alloy on the zinc alloy die casting. In order to achieve the purpose, the utility model adopts the following technical scheme:
a coating structure for plating a gold-cobalt alloy on a zinc alloy die casting comprises a zinc alloy substrate, and an alkaline zinc-nickel alloy coating, a chemical nickel coating, a pyrophosphate copper coating, an acid copper coating, a bright nickel coating and a gold-cobalt alloy coating which are sequentially prepared on the zinc alloy substrate from inside to outside.
In some embodiments, the thickness of the alkaline zinc-nickel alloy coating is 5-15 μm.
In some embodiments, the electroless nickel layer is a low-phosphorous electroless nickel layer, and the plating thickness is 1-5 μm.
In some embodiments, the pyrophosphate copper plating layer has a thickness of 5 to 10 μm.
In some embodiments, the thickness of the acid copper plating layer is 5-20 μm.
In some embodiments, the bright nickel coating has a thickness of 5-15 μm.
In some embodiments, the Au-Co alloy coating is an acidic Au-Co alloy coating, and the thickness of the coating is 0.1-1 μm.
The alkaline zinc-nickel alloy plating solution has higher dispersing capacity and deep plating capacity, the plating layer has higher corrosion resistance, and the alkaline zinc-nickel alloy plating on the zinc alloy die casting can effectively seal holes and improve the corrosion resistance. Chemical nickel plating can be carried out on the zinc-nickel alloy plating layer, and the binding force is good, so the cyanide copper plating layer can be replaced by the chemical nickel plating layer.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model discloses a coating structure of a zinc alloy die casting plated with a gold-cobalt alloy, which adopts alkaline zinc-nickel alloy plating to prepare a bottom coating, can effectively seal the pores on the surface layer of the zinc alloy die casting, and obviously improve the corrosion resistance of the coating;
2. the chemical nickel plating layer is adopted to replace a cyanide copper plating layer, so that the limitation of using highly toxic cyanide in the existing preparation process is eliminated;
3. in the coating structure for plating the gold-cobalt alloy on the zinc alloy die casting, the nickel-phosphorus alloy is not plated after the bright nickel is plated, so that the electroplating cost is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, do not constitute a limitation of the invention, and in which:
FIG. 1 is a schematic diagram of the structure of the plating layer in examples 1 and 2 of the present invention.
Detailed Description
The invention will be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions are provided to explain the invention, but not to limit the invention.
Example 1:
as shown in figure 1, the coating structure of the gold-cobalt alloy plating of the zinc alloy die casting comprises a zinc alloy substrate 1, and an alkaline zinc-nickel alloy plating layer 2, an electroless nickel plating layer 3, a pyrophosphate copper plating layer 4, an acid copper plating layer 5, a bright nickel plating layer 6 and a gold-cobalt alloy plating layer 7 which are sequentially prepared on the zinc alloy substrate 1 from inside to outside.
The thickness of the zinc-nickel alloy coating 2 is 5-7 mu m, and the zinc-nickel alloy coating is prepared by adopting a Detron 1215 alkaline zinc-nickel alloy electroplating process of the ultra-high chemical industry. The plating solution comprises the following components and operating conditions: 5.5-8.5 g/L Zn, 1.0-1.8 g/L Ni (provided by 13-22 mL/L DETRONZIN 1215 Ni replenisher), 120-135 g/L NaOH, 90-110 mL/L DETRONZIN 1215 Base adjuvant, 1.0-5.0 mL/L DETRONIN 1215 Brightener main polish, 0.1-0.8 mL/L DETRONZIN 1215 purifier decontaminant, 21-25 deg.C bath temperature, and 1.0-3.0A/dm of cathode current density2The cathode moves 4-6 m/min.
The chemical nickel-plating layer 3 is a low-phosphorus chemical nickel-plating layer, has the thickness of 2-3 mu m, and is prepared by adopting GG-182 alkaline chemical nickel-plating process of ultra-bonding chemical industry. The plating solution components and the operation conditions are as follows: 40-60 mL/L of GG-182A additive, 30-50 mL/L of GG-182B reducing agent, 30-50 mL/L of GG-182C stabilizer, 30-50 ℃ of operation temperature, 8.5-9.5 of pH range and 8-15 min of time.
The pyrophosphate copper plating layer 4 is 7-8 microns thick and is prepared by adopting the existing pyrophosphate copper plating process.
The thickness of the acid copper plating layer is 13-15 mu m, and the acid copper plating layer is prepared by adopting the existing acid copper plating process.
The thickness of the bright nickel plating layer is 10-12 mu m, and the bright nickel plating layer is prepared by adopting the existing bright nickel plating process.
The thickness of the gold-cobalt alloy coating is 0.2-0.3 mu m, and the gold-cobalt alloy coating is prepared by adopting a Baliloy300 FC3N acid gold-cobalt alloy electroplating process in the ultra-high chemical industry. The plating solution components and the operation conditions are as follows: BALILOY300 FC MU Cylinder opening agent 80mL/L, BALILOY CO cobalt salt 2mL/L, potassium aurocyanide 370g/L, pH range 3.6-4.0, operation temperature 30-40 deg.C, cathode current density 0.6A/dm2The cathode moves for 4-6 m/min, and the electroplating time is 2-4 min.
The operation of the embodiment is divided into the following steps:
1. pretreatment: the zinc alloy part 1 is subjected to the steps of "chemical degreasing and dewaxing → water washing → etching → water washing → bleaching → water washing".
2. Electroplating zinc-nickel alloy: the zinc alloy die casting 1 after pretreatment is prepared into a zinc-nickel alloy coating 2 by adopting a Detronzin 1215 alkaline zinc-nickel alloy electroplating process.
3. Chemical nickel plating: and preparing a chemical nickel-plating layer 3 on the zinc-nickel alloy plating layer 2 by adopting a GG-182 alkaline chemical nickel-plating process.
4. Pyrophosphate copper plating: the pyrophosphate copper plating layer 4 is prepared on the chemical nickel plating layer 3 by adopting the existing pyrocopper plating process.
5. Acid copper plating: and preparing an acid copper plating layer 5 on the pyrophosphate copper plating layer 4 by adopting the existing acid copper plating process.
6. Plating bright nickel: and preparing a bright nickel plating layer 6 on the acid copper plating layer 5 by adopting the existing bright nickel plating process.
7. Plating a gold-cobalt alloy: and preparing a gold-cobalt alloy coating 7 on the bright nickel coating 6 by adopting a BALILOY300 FC3N acid gold-cobalt alloy electroplating process.
Example 2:
as shown in figure 1, the coating structure of the gold-cobalt alloy plating of the zinc alloy die casting comprises a zinc alloy substrate 1, and an alkaline zinc-nickel alloy plating layer 2, an electroless nickel plating layer 3, a pyrophosphate copper plating layer 4, an acid copper plating layer 5, a bright nickel plating layer 6 and a gold-cobalt alloy plating layer 7 which are sequentially prepared on the zinc alloy substrate 1 from inside to outside.
The thickness of the zinc-nickel alloy coating 2 is 8-10 mu m, and the zinc-nickel alloy coating is prepared by adopting a DETRONZIN 510 alkaline zinc-nickel alloy electroplating process in the ultra-high chemical industry. The plating solution comprises the following components and operating conditions: 6-9 g/L of zinc, 1.3-1.9 g/L of nickel (provided by DetroNZIN 515 nickel replenisher 17-23 mL/L), 100-130 g/L of sodium hydroxide, 100-130 mL/L of DEtroNZIN 510 auxiliary agent, 6.0-10 mL/L of DEtroNZIN 511 cylinder opener, 6.0-10 mL/L of DEtroNZIN 512 brightener, 21-25 ℃ of plating bath temperature and 0.5-3.0A/dm of cathode current density2The cathode is moved 4-6 m/min.
The chemical nickel-plating layer 3 is a low-phosphorus chemical nickel-plating layer with the thickness of 2-3 mu m and is prepared by adopting GG-178 alkaline chemical nickel-plating process of ultra-bonding chemical industry. The plating solution components and the operation conditions are as follows: 25-50 mL/L of GG-178A additive, 25-40 mL/L of GG-178B reducing agent, 30-60 mL/L of GG-178C stabilizer, 25-38 ℃ of operation temperature, 8.5-9.5 of pH value and 8-15 min of time.
The pyrophosphate copper plating layer 4 is 5-6 microns thick and is prepared by adopting the existing pyrophosphate copper plating process.
The thickness of the acid copper plating layer is 15-18 mu m, and the acid copper plating layer is prepared by adopting the existing acid copper plating process.
The thickness of the bright nickel plating layer is 8-10 mu m, and the bright nickel plating layer is prepared by adopting the existing bright nickel plating process.
The thickness of the gold-cobalt alloy coating is 0.2-0.3 mu m, and the gold-cobalt alloy coating is prepared by adopting a Baliloy300 FC3N acid gold-cobalt alloy electroplating process in the ultra-bonding chemical industry. The plating solution components and the operation conditions are as follows: BALILOY300 FC MU Cylinder opening agent 80mL/L, BALILOY CO cobalt salt 2mL/L, potassium aurocyanide 370g/L, pH range 3.6-4.0, operation temperature 30-40 deg.C, cathode current density 0.8A/dm2The cathode moves for 4-6 m/min, and the electroplating time is 2-3 min.
The operation of the embodiment is divided into the following steps:
1. pretreatment: the zinc alloy die casting 1 is subjected to the steps of "chemical degreasing and dewaxing → water washing → etching → water washing → bleaching → water washing".
2. Electroplating zinc-nickel alloy: the zinc alloy part 1 after pretreatment is prepared into a zinc-nickel alloy coating 2 by adopting a Detronzin 510 alkaline zinc-nickel alloy electroplating process.
3. Chemical nickel plating: and preparing a chemical nickel-plating layer 3 on the zinc-nickel alloy plating layer 2 by adopting a GG-178 alkaline chemical nickel-plating process.
4. Pyrophosphate copper plating: pyrophosphate copper plating 4 is prepared on the chemical nickel plating layer 3 by adopting the existing pyrocopper plating process.
5. Acid copper plating: and preparing an acid copper plating layer 5 on the pyrophosphate copper plating layer 4 by adopting the existing acid copper plating process.
6. Plating bright nickel: and preparing a bright nickel plating layer 6 on the acid copper plating layer 5 by adopting the existing bright nickel plating process.
7. Plating a gold-cobalt alloy: and preparing a gold-cobalt alloy plating layer 7 on the bright nickel plating layer 6 by adopting a BALILOY300 FC3N acid gold-cobalt alloy electroplating process.
The electroplated parts prepared in the embodiments 1 and 2 are subjected to a neutral salt spray test for 120h according to GB/T10125-2012 salt spray test for artificial atmosphere corrosion test, and no corrosive substances are generated on the surfaces of the electroplated parts.
The plated articles prepared in examples 1 and 2 were tested for plating adhesion by thermal shock test according to JB 2111-. And (3) heating the plated part to 190 ℃ in a heating furnace, taking out the plated part, and placing the plated part into water at room temperature for sudden cooling, wherein the plated layer does not generate bubbles and fall off, and the plated layer has good bonding force.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the above embodiments are only applicable to help understand the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the description should not be construed as a limitation to the present invention.
Claims (7)
1. The utility model provides a zinc alloy die casting plates cladding material structure of gold cobalt alloy which characterized in that: the zinc alloy plating layer is prepared from a zinc alloy substrate, and an alkaline zinc-nickel alloy plating layer, a chemical nickel plating layer, a pyrophosphate copper plating layer, an acid copper plating layer, a bright nickel plating layer and a gold-cobalt alloy plating layer which are sequentially prepared from inside to outside on the zinc alloy substrate.
2. The coating structure for coating a zinc alloy die casting with a gold-cobalt alloy according to claim 1, wherein: the thickness of the alkaline zinc-nickel alloy coating is 5-15 mu m.
3. The plating structure of the gold-cobalt alloy plating of the zinc alloy die casting according to claim 1, characterized in that: the chemical nickel plating layer is a low-phosphorus chemical nickel plating layer, and the thickness of the plating layer is 1-5 mu m.
4. The plating structure of the gold-cobalt alloy plating of the zinc alloy die casting according to claim 1, characterized in that: the pyrophosphate copper plating layer is 5-10 μm thick.
5. The plating structure of the gold-cobalt alloy plating of the zinc alloy die casting according to claim 1, characterized in that: the thickness of the acid copper plating layer is 5-20 mu m.
6. The plating structure of the gold-cobalt alloy plating of the zinc alloy die casting according to claim 1, characterized in that: the thickness of the bright nickel coating is 5-15 mu m.
7. The plating structure of the gold-cobalt alloy plating of the zinc alloy die casting according to claim 1, characterized in that: the gold-cobalt alloy coating is an acid gold-cobalt alloy coating, and the thickness of the gold-cobalt alloy coating is 0.1-1 mu m.
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| CN114836801A (en) * | 2022-06-21 | 2022-08-02 | 中船九江精达科技股份有限公司 | Multi-layer electroplating process of beryllium bronze elastic device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114836801A (en) * | 2022-06-21 | 2022-08-02 | 中船九江精达科技股份有限公司 | Multi-layer electroplating process of beryllium bronze elastic device |
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