Cyanogen-free silver-plating electroplating liquid containing auxiliary complexing agent

Abstract

The invention discloses cyanogen-free silver-plating electroplating liquid containing an auxiliary complexing agent. The cyanogen-free silver-plating electroplating liquid containing the auxiliary complexing agent is composed of a silver ion source material, a complexing agent, the auxiliary complexing agent, a supporting electrolyte, an electroplating additive, a pH adjusting agent and the like;the components of the electroplating liquid and the contents are as follows: 30-60 g / L of silver ion source material, 140-200 g / L of complexing agent, 10-50 g / L of auxiliary complexing agent, 10-30 g / L of supporting electrolyte, 100-800 mg / L of electroplating additive and 10-30 g / L of pH adjusting agent. The cyanogen-free silver-plating electroplating liquid containing the auxiliary complexing agent provided by the invention has the advantages that: the electroplating liquid is stable and has low toxicity, the anodic passivation in the electroplating process can be better inhibited, the anodeis normally dissolved, the electroplating liquid can be continuously utilized for long time, the electroplating layer has a good bonding force and is bright, and the electroplating liquid can be applied to multiple fields including decorative electroplating, functional electroplating and the like.

Description

technical field [0001] The invention belongs to the technical field of electrochemical silver plating, and in particular relates to a cyanide-free silver plating solution containing an auxiliary complexing agent. Background technique [0002] The silver-plated layer has high electrical and thermal conductivity, good welding performance, high chemical stability to organic acids and alkalis, and its price is cheaper than other precious metals. It has been widely used in the electronics industry, decorations, tableware and various A variety of handicrafts and other fields. [0003] Due to the advantages of high current efficiency, good dispersing ability, strong covering ability, and fine crystallization of the coating, so far, most of the silver plating processes at home and abroad still use the cyanide silver plating process to electroplate the silver layer. However, cyanide silver plating solution is highly toxic, seriously pollutes the environment, endangers the health of ...

AI Technical Summary

Problems solved by technology

However, it can be seen from the current research status that the current efforts of cyanide-free silver plating are mainly focused on finding better complexing agents and additives, especially those substances that have a great impact on the cathode process, and have a negative effect on the anode passivation during the electrodeposition process. There is little research on chemicalization and its inhibition

The anode passivation will greatly interfere with electroplating silver, especially for long-term continuous operation, the anode passivation will cause the coating to be rough and dull

Images