CN212925172U - Environment-friendly rhodium-plated coating structure for zinc alloy die castings - Google Patents
Environment-friendly rhodium-plated coating structure for zinc alloy die castings Download PDFInfo
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- CN212925172U CN212925172U CN202020411234.6U CN202020411234U CN212925172U CN 212925172 U CN212925172 U CN 212925172U CN 202020411234 U CN202020411234 U CN 202020411234U CN 212925172 U CN212925172 U CN 212925172U
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Abstract
The utility model discloses a zinc alloy die casting environment-friendly plating layer structure of rhodium that plates, including the zinc alloy base member and the alkaline zinc-nickel alloy cladding material, chemical nickel coating, pyrophosphate copper plate, acid copper cladding material, bright nickel cladding material, palladium steel cladding material, the rhodium-plated layer that prepares gradually from inside to outside on the zinc alloy base member. The utility model discloses an environment-friendly plating layer structure of rhodium that plates, preparation technology environmental protection carries out neutral salt fog test 120 hours according to GB/T10125 + 2012 "artificial atmosphere corrosion test salt fog test", plates a surperficial no corrosive substance and generates, has good corrosion resistance.
Description
Technical Field
The utility model belongs to the metal plating field, concretely relates to zinc alloy die casting environment-friendly rhodium-plated coating structure.
Background
Rhodium is a platinum group element, and among the platinum group elements, rhodium has the smallest resistivity and the highest reflectance to visible light. The acid rhodium plating layer is silvery white in appearance, slightly bluish in color, glossy, wear-resistant and free from discoloration. The chemical property is very stable, the product is not dissolved in general strong acid and alkali, and is not easy to dissolve even in aqua regia, and the product has very strong oxidation resistance and corrosion resistance, very high stability to inorganic acid and salt, organic acid and salt, sulfide, carbon dioxide and other media, and also has the characteristics of electric arc resistance, low and stable contact resistance and the like. As the surface plating layer, rhodium is widely used in the fields of decorative plating and electronic plating. In the aspect of decorative electroplating, rhodium plating is commonly used for electroplating zinc alloy die castings such as jewelry, clocks and eyeglass accessories.
The traditional process for plating rhodium on zinc alloy die castings uses cyanide copper plating as a pre-plating layer, and since cyanide is a highly toxic compound, the use of cyanide is strictly prohibited by governments in various countries, and cyanide electroplating processes such as cyanide copper plating and the like are gradually eliminated in the global range.
The zinc alloy die casting surface has more pores, the prior art adopts cyanide copper plating to seal the pores on the zinc alloy die casting surface, and the cyanide copper plating is used as a pre-plating layer of pyrophosphate copper plating. Under the background that cyanide is prohibited, how to adopt environment-friendly electroplating technology to replace cyanide copper plating is an urgent problem to be solved in the industry.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that the rhodium-plated zinc alloy die casting contains cyanide copper plating technology, the utility model provides a plating layer structure of rhodium is plated to zinc alloy die casting environment-friendly. In order to achieve the purpose, the utility model adopts the following technical scheme:
an environment-friendly rhodium-plated coating structure for zinc alloy die castings comprises a zinc alloy base body, and an alkaline zinc-nickel alloy coating, a chemical nickel-plating layer, a pyrophosphate copper-plating layer, an acid copper coating, a bright nickel coating, a palladium steel coating and a rhodium-plated coating which are sequentially prepared on the zinc alloy base body 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 has a thickness of 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 palladium steel plating layer has a thickness of 0.1 to 1 μm.
In some of the embodiments, the thickness of the rhodium-plated layer is 0.02-0.1 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, pyrophosphate copper plating can be carried out on the chemical nickel plating layer, and the bonding force between the plating layers is good, so the zinc-nickel alloy plating layer and the chemical nickel plating layer can replace a cyanide copper plating layer.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model discloses an environment-friendly rhodium-plated coating structure of zinc alloy die castings, which adopts the electroplating alkaline zinc-nickel alloy to prepare a bottom coating, can effectively seal the pores on the surface layer of the zinc alloy die castings, and obviously improves the corrosion resistance of the coating;
2. the process of electroplating alkaline zinc-nickel alloy and chemically plating nickel to replace a cyanide copper plating process is adopted, so that the limitation of using highly toxic cyanide and potential safety hazard caused by the use of the highly toxic cyanide in the prior art are eliminated;
3. the palladium steel plating layer is used as the bottom layer of the rhodium-plated layer, so that the thickness of the rhodium-plated layer can be reduced, and 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 zinc alloy die casting environment-friendly rhodium plating layer structure 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, a palladium steel plating layer 7 and a rhodium plating layer 8 which are sequentially prepared on the zinc alloy substrate 1 from inside to outside.
The thickness of the alkaline zinc-nickel alloy coating 2 is 5-7 mu m, and the alkaline zinc-nickel alloy coating is prepared by adopting the existing alkaline zinc-nickel alloy electroplating process.
The thickness of the chemical nickel-plating layer 3 is 2-3 mu m, and the chemical nickel-plating layer 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 5 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 6 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 palladium steel plating layer 7 is 0.3-0.5 mu m, and the palladium steel plating layer is prepared by a PALLASDIO 720 INOX palladium steel plating process of ultra-high chemical engineering. The plating solution components and the operation conditions are as follows: 995mL/L of PALLASDIO 720 INOX MPM palladium steel cylinder opening agent, 5mL/L of 50% ammonium chloride palladium solution by mass fraction, wherein the palladium content is 3.0-4.0 g/L, the pH range is 8.0-8.5, the operating temperature is 35-45 ℃, and the cathode current density is 0.7A/dm2The cathode moves 3-5 m/min, and the electroplating time is 2-4 min.
The thickness of the rhodium-plated layer 8 is 0.03-0.04 mu m, and the rhodium-plated layer is prepared by adopting a RHW-10 decorative rhodium plating process in the Chaobang chemical industry. The plating solution components and the operation conditions are as follows: 20mL/L of RHW-10 rhodium water replenisher, 40mL/L of RHW-10B additive and 22mL/L of sulfuric acid, wherein the rhodium content is 1-2 g/L, the operation temperature is 40-50 ℃, and the cathode current density is 1A/dm2The cathode moves for 4-6 m/min, and the electroplating time is 1-1.5 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 wax removal → water washing → ultrasonic wax removal → water washing → chemical degreasing → water washing → acid salt activation → water washing".
2. Electroplating zinc-nickel alloy: preparing an alkaline zinc-nickel alloy coating 2 on the pretreated zinc alloy substrate 1.
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: a pyrophosphate copper plating layer 4 was prepared on the electroless nickel plating layer 3.
5. Acid copper plating: an acid copper plating layer 5 is prepared on the pyrophosphate copper plating layer 4.
6. Plating bright nickel: a bright nickel plating layer 6 is prepared on the acid copper plating layer 5.
7. Plating palladium steel: and preparing a palladium steel plating layer 7 on the bright nickel plating layer 6 by adopting a PALLASDIO 720 INOX palladium steel plating process.
8. Plating rhodium: and a rhodium-plated layer 8 is prepared on the palladium steel plating layer 7 by adopting an RHW-10 decorative rhodium plating process.
Example 2:
as shown in figure 1, the zinc alloy die casting environment-friendly rhodium plating layer structure 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, a palladium steel plating layer 7 and a rhodium plating layer 8 which are sequentially prepared on the zinc alloy substrate 1 from inside to outside.
The thickness of the alkaline zinc-nickel alloy coating 2 is 8-10 mu m, and the alkaline zinc-nickel alloy coating is prepared by adopting the existing alkaline zinc-nickel alloy electroplating process.
The thickness of the chemical nickel-plating layer 3 is 2-3 mu m, and the chemical nickel-plating layer is prepared by adopting GG-178 alkaline chemical nickel-plating process of ultra-high 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 5 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 6 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 palladium steel plating layer 7 is 0.5-0.7 mu m, and the palladium steel plating layer is prepared by a PALLASDIO 720 INOX palladium steel plating process of ultra-high chemical engineering. The plating solution components and the operation conditions are as follows: 995mL/L of PALLASDIO 720 INOX MPM palladium steel cylinder opening agent, 5mL/L of 50% ammonium chloride palladium solution by mass fraction, wherein the palladium content is 4.0-5.0 g/L, the pH range is 8.0-8.5, the operating temperature is 35-45 ℃, and the cathode current density is 0.9A/dm2The cathode moves 3-5 m/min, and the electroplating time is 2.5-4 min.
The thickness of the rhodium-plated layer 8 is 0.04-0.05 mu m, and the rhodium-plated layer is prepared by adopting a RHW-10 decorative rhodium plating process in the Chaobang chemical industry. The plating solution components and the operation conditions are as follows: 20mL/L of RHW-10 rhodium water replenisher, 40mL/L of RHW-10B additive and 22mL/L of sulfuric acid, wherein the rhodium content is 1.5-2.5 g/L, the operation temperature is 40-50 ℃, and the cathode current density is 1.5A/dm2The cathode is moved for 4 to 6m/min,the electroplating time is 1-1.2 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 wax removal → water washing → ultrasonic wax removal → water washing → chemical degreasing → water washing → acid salt activation → water washing".
2. Electroplating zinc-nickel alloy: preparing an alkaline zinc-nickel alloy coating 2 on the pretreated zinc alloy substrate 1.
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 was prepared on the electroless nickel plating layer 3.
5. Acid copper plating: an acid copper plating layer 5 is prepared on the pyrophosphate copper plating layer 4.
6. Plating bright nickel: a bright nickel plating layer 6 is prepared on the acid copper plating layer 5.
7. Plating palladium steel: and preparing a palladium steel plating layer 7 on the bright nickel plating layer 6 by adopting a PALLASDIO 720 INOX palladium steel plating process.
8. Plating rhodium: and a rhodium-plated layer 8 is prepared on the palladium steel plating layer 7 by adopting an RHW-10 decorative rhodium plating process.
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 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 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 (8)
1. The utility model provides a zinc alloy die casting environment-friendly rhodium-plated coating structure which characterized in that: the zinc alloy plating solution comprises a zinc alloy matrix, 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, a palladium steel plating layer and a rhodium plating layer which are sequentially prepared on the zinc alloy matrix from inside to outside.
2. The zinc alloy die casting environment-friendly rhodium-plated coating structure as set forth in claim 1, wherein: the thickness of the alkaline zinc-nickel alloy coating is 5-15 mu m.
3. The zinc alloy die casting environment-friendly rhodium-plated coating structure as set forth in claim 1, wherein: the thickness of the chemical nickel-plating layer is 1-5 mu m.
4. The zinc alloy die casting environment-friendly rhodium-plated coating structure as set forth in claim 1, wherein: the pyrophosphate copper plating layer is 5-10 μm thick.
5. The zinc alloy die casting environment-friendly rhodium-plated coating structure as set forth in claim 1, wherein: the thickness of the acid copper plating layer is 5-20 mu m.
6. The zinc alloy die casting environment-friendly rhodium-plated coating structure as set forth in claim 1, wherein: the thickness of the bright nickel coating is 5-15 mu m.
7. The zinc alloy die casting environment-friendly rhodium-plated coating structure as set forth in claim 1, wherein: the thickness of the palladium steel coating is 0.1-1 mu m.
8. The zinc alloy die casting environment-friendly rhodium-plated coating structure as set forth in claim 1, wherein: the thickness of the rhodium-plated layer is 0.02-0.1 μm.
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