A kind of surface electroplating solution and electroplating process for alloy

Abstract

The invention discloses a surface electroplating solution and an electroplating process for alloys. The electroplating solution consists of the following components: soluble palladium salt, soluble platinum salt, complexing agent, conductive salt, buffer, brightener, stabilizer and Anti-pinhole agent, the balance is solvent, and the solvent is deionized water. The electroplating process is: preparation of electroplating solution; pre-plating treatment includes degreasing, grinding, polishing, activation; electroplating; the electroplating solution has good stability and environmental protection; The platinum-palladium plating layer obtained by electroplating with the electroplating solution of the present invention is uniform and compact, has high hardness, good corrosion resistance, good adhesion with alloy parts substrate, bright plating layer, no peeling and bubbling phenomenon of the plating layer; the electroplating process is simple to operate, The conditions are controllable. By controlling the process parameters in the electroplating process and evenly distributing the electroplating anodes around the cathodes, the composition of the coating layer is controllable, the electroplating efficiency is high, the environment is friendly, and it is suitable for promotion.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to a surface electroplating solution and an electroplating process for alloys. Background technique [0002] An alloy is a solid product with metallic properties obtained after mixing and melting one metal with another or several metals or nonmetals, and cooling and solidifying. The surface of the alloy is exposed to rainwater, seawater or chemical substances for a long time, and the surface will be relatively easy to corrode. In order to protect the surface of the alloy well, a thin coating is often electroplated on the surface of the alloy. Electroplating is a traditional method for preparing coatings. The properties of coatings can be strictly controlled by controlling parameters and other conditions. The preparation cost is low, and it can adapt to the shape of complex substrates, so it is widely used. [0003] At present, the coatings used include hexavalent chromium, c...

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Problems solved by technology

[0003] At present, the coatings used include hexavalent chromium, copper-tin alloy, silver, gold, etc., but the sewage generated by the electroplating process of hexavalent chromium is difficult to treat, which seriously pollutes the environment and the coating is not environmentally friendly; the white copper-tin coating can only withstand 80-100 °C , exceeding this temperature, the coating will turn black and blue, and cannot maintain the silvery white color; the most commonly used silver plating solution in the silver plating process is the silver plating solution containing cyanide, because cyanide is a highly toxic substance , this silver plating solution containing cyanide will greatly endanger the health of silver plating workers

[0004] Pure gold electroplating film is widely used in the surface treatment of alloy parts due to its good conductivity, weldability, ductility and excellent corrosion resistance. However, in recent years, the price of gold has continued to rise, resulting in gold plating The cost rises, therefore, the improvement of the gold plating process mostly starts from saving the amount of gold used

Among them, the thinning of the gold coating is to compensate for the rising cost of raw materials. However, if the coating is too thin, it is easy to cause pinholes on the coating, which will affect a series of functions of the coating. If the sealing operation is added, the process will be more efficient. Complicated and cumbersome, and the quality of electroplating is poor, and the phenomenon of uneven distribution of electroplating layer often occurs

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