Gold-silver-rhodium multilayer composite plating process

A multi-layer composite and electroplating process technology, applied in the field of surface treatment, can solve problems affecting product reliability and airtightness, and achieve the effects of easy welding, low porosity and uniform distribution

Active Publication Date: 2013-02-20
四川泛华航空仪表电器有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] 3. Nickel-silver-platinum-rhodium multi-layer composite electroplating process uses nickel as the bottom layer of the silver layer. Because the hardness of nickel is high, it cannot restrain the running of the silver layer at high te

Method used

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  • Gold-silver-rhodium multilayer composite plating process
  • Gold-silver-rhodium multilayer composite plating process

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Embodiment Construction

[0024] refer to figure 1 . The parts have been mechanically processed and heat treated before electroplating. First, they are cleaned with gasoline, then cleaned with metal oil cleaning agent, dehydrated with anhydrous ethanol, blown dry, and electropolished to level the roughness of the metal surface and produce luster to obtain a smooth and bright surface. surface. Design a specific electroplating rack to fully ensure that the surface power lines of the parts to be plated are evenly distributed. Hang the parts that have been degreased and cleaned and dried, and electroplate the parts according to the process flow chart.

[0025] Gold, silver and rhodium multilayer composite electroplating process, including electropolishing process, cyanide pretreatment process, citrate gold plating process, cyanide silver plating process, phosphate rhodium plating process, and then heat treatment process. The gold-silver-rhodium multilayer composite electroplating process comprises the s...

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Abstract

The invention provides a gold-silver-rhodium multilayer composite plating process. According to the process, a rhodanizing coating does not crack, bubbling, peeling and falling off of each plating can be avoided, platings are well combined and do not discolor, the service life is high, and movement of a silver plating can be effectively constrained at a high temperature. According to the technical scheme, a cyaniding pre-silver-plating process is added before gold plating, a 3ml/L-8ml/L of cyaniding silver plating solution is added in a cyaniding tank, a reversing power supply is adopted after cyaniding, and a thin silver layer is plated reversely in the solution, after the cyaniding pre-silver-plating process, citrate is adopted for gold plating; after the gold plating, silver is plated through cyaniding, rhodium is plated through phosphate, after the rhodium plating, vacuum annealing heat treatment is performed at the temperature of 900-950 DEG C to evenly coat the three precious metal of the gold, the silver and the rhodium on the surface of a part. According to the process, under the condition that a rhodium plating of a contact type switching element such as a reed switch can not be welded, one end of a workpiece can be welded with a wire or sealed with glass, and bubbles, cracks and air tightness problems are not easy to cause.

Description

technical field [0001] The invention relates to a surface treatment technology for multi-layer precious metal gold, silver and rhodium electroplating, and is mainly aimed at the surface treatment method of the elastic reed of a reed switch. Background technique [0002] The multi-layer precious metal gold, silver and rhodium electroplating surface treatment process is a relatively complicated and costly process treatment method. Among them, technical parameters such as the electroplating solution formula, electroplating solution pH value, electroplating temperature, electroplating time, electrode current density and so on gold plating, silver plating process and rhodium plating process all have special requirements. To obtain the technical parameters of the precious metal gold, silver and rhodium multilayer composite electroplating process needs to pass through a long time, even many times of experiments. Multi-layer precious metal gold, silver and rhodium electroplating mu...

Claims

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Application Information

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IPC IPC(8): C25D5/10C25D3/46C25D3/48C25D3/50
Inventor 文昌红
Owner 四川泛华航空仪表电器有限公司
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