Environment-friendly barrel-plating type trivalent chromium plating solution and barrel-plating method thereof

Abstract

The invention provides an environment-friendly barrel-plating type trivalent chromium plating solution and a barrel-plating method thereof, belonging to the field of a plating process. Aiming at the serious problems of large toxicity, heavy pollution, difficult wastewater treatment and the like due to the existence of hexavalent chromium in the existing barrel-plating process for plating chromium, the invention develops an environment-friendly trivalent chromium plating solution suitable for barrel-plating application and a barrel-plating method thereof. The plating solution is mainly prepared from a main salt, a complexing agent, a stabilizing agent, a wetting agent, a conducting salt, a buffering agent and water and also comprises a displacement agent. The invention has the advantages of cleanness and no pollution, and a plating layer has uniform and bright appearance and high corrosion resistance; and in the process provided by the invention, the acidity control is moderate, so that the phenomenon of dissolution of the plating layer can not appear even if the power is switched off. After the displacement agent is introduced into the environment-friendly trivalent chromium plating solution provided by the invention, the displacement and dispersion capabilities of the plating layer can be effectively improved, and the current efficiency and the rate of finished products can be effectively improved. The plating solution is suitable for barrel-plating operation of trivalent chromium on a workpiece.

Description

field of invention [0001] The invention relates to an electroplating process, more specifically, to a barrel plating type trivalent chromium electroplating process. Background technique [0002] Chrome plating has good hardness, wear resistance, corrosion resistance and decorative properties, and is one of the most widely used plating types in the electroplating industry. However, the current chrome plating mainly adopts the rack plating process, which is extremely rare in the barrel plating application, which limits the application of the chrome plating process in the electroplating of small parts. The main reason is that the chrome plating process is out of position and has poor dispersion ability, which often leads to the situation that the low area cannot be covered by plating. Even the traditional barrel plating process can only be used for electroplating some simple parts without low areas, especially when the power is turned off, the coating is prone to acid dissolut...

AI Technical Summary

Problems solved by technology

However, the current chrome plating mainly adopts the rack plating process, which is extremely rare in the barrel plating application, which limits the application of the chrome plating process in the electroplating of small parts

The main reason is that the chrome plating process is out of position and has poor dispersion ability, and there are often situations where the plating in the low area cannot be covered.

Even the traditional barrel plating process can only be used for electroplating some simple parts without low areas, especially when the power is turned off, the coating is prone to acid dissolution

The obtained coating has poor corrosion resistance, black coating, and high overall cost

[0003] Moreover, the barrel plating process contains hexavalent chromium, which has serious problems such as high toxicity, heavy pollution, and difficult wastewater treatment.

The existence of the above-mentioned problems forces the chromium barrel plating process to be unable to obtain good promotion and application

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