Copper-based workpiece electroplated with thick silver and manufacturing method thereof

Abstract

The invention discloses a copper-based workpiece electroplated with thick silver and a manufacturing method of the copper-based workpiece. The manufacturing method comprises the steps of pretreatment, electroplating of a bottom gold layer, electroplating of an acid light copper layer, electroplating of a palladium cobalt layer, electroplating of a gold layer, electroplating of a silver layer, stress relief and treatment of an anti-discoloration coating. The surface of the copper-based workpiece electroplated with the thick silver comprises the bottom gold layer, the acid light copper layer, the palladium cobalt layer, the gold layer, the silver layer and the anti-discoloration coating in sequence from inside to outside. According to the manufacturing method, the bottom gold electroplating treatment is carried out before thick silver electroplating is conducted, the annealing treatment is carried out after thick silver electroplating is accomplished, the anti-discoloration coating treatment is carried out on the surface of the thick silver plating layer, and therefore the prepared electroplated thick silver is firmly combined with a copper base and is not prone to peeling, the service life of the silver plating layer is prolonged, the plating layer is uniform and compact, the color is silvery white, and the good oxidation discoloration resistance is achieved.

Description

Technical field [0001] The present invention relates to a plating processing technology, and particularly relates to a method for manufacturing a copper piece and a thick silver plating. Background technique [0002] Silver-plated metal member is a common method of metal surface treatment, by silver-plated metal parts can improve the wear resistance, corrosion resistance, electrical conductivity, and a metal reinforcement member reflective surface appearance and enhancing the like. There is now widely used method for wet silver plating, silver wet but usually mostly silver cyanide salt, mainly cyanide salt bath stability is good, the production process is easy to control, but in the plating process will produce highly toxic cyanide, and the passivation solution containing chromium, are difficult to handle, easy to cause harm to the environment and production personnel; Further, the silver plating layer is thin wet silver obtained by the method, the presence of resistant differenc...

AI Technical Summary

Problems solved by technology

At present, people generally use water wet silver plating method for electroplating treatment, but the silver salt usually used in water wet silver plating is mostly cyanide salt, which is mainly because the cyanide salt bath has good stability and the production process is easy to control. In the process, highly toxic cyanide will be produced, and the passivation solution contains chromium, which is difficult to handle and is easy to cause harm to the environment and production personnel; in addition, the silver layer obtained by the wet silver plating method is relatively thin, and there are The defect of poor abrasive performance, the silver-plated surface is prone to peeling, which will affect the appearance of the entire metal part and further reduce the service life of the metal part

In the prior art, in order to improve its service life, multiple electroplating is usually used to increase the thickness of the silver plating layer, but the existing electroplating thick silver has the defect of poor bonding force of each plating layer