Sliver-plating electroplate liquid and preparation method thereof

Abstract

The invention discloses sliver-plating electroplate liquid and a preparation method thereof. The preparation method comprises the steps that (1) soluble silver salt, potassium borohydrate, 3-nitrophthalic acid, succinimide, methanesulfonic acid and water are mixed to obtain a mixture M1; (2) alkali is added to the mixture M1, and the pH value is adjusted to 10-12, and a mixture M2 is obtained; (3) the mixture M2, an auxiliary complexing agent, alanine and glycerinum are subjected to heat processing to obtain a mixture M3; and (4) the mixture M3 is post-processed to obtain the sliver-plating electroplate liquid. The auxiliary complexing agent is selected from one or several of citric acid, thiourea compounds and dithio-glycol. The sliver-plating electroplate liquid prepared through the method is stable in performance, and a silver coating obtained by the sliver-plating electroplate liquid in an electroplating mode is compact, even, high in adhesive force, high in hardness and not prone to darkening and browning.

Description

technical field [0001] The invention relates to the field of silver electroplating, in particular to a silver plating electroplating solution and a preparation method thereof. Background technique [0002] Electroplated silver plating is used to prevent metal corrosion, increase electrical conductivity, and reflect light. It is widely used in manufacturing industries such as electrical appliances, instruments, meters and lighting appliances. In the past two decades, my country's silver plating process has been greatly developed. [0003] The silver plating solution is an indispensable factor in the silver plating process. The performance of the silver plating solution directly affects the quality of the silver plating layer. At present, the most commonly used silver plating solution in the silver plating process is cyanide-containing Because cyanide is a highly toxic substance, this silver-plating solution containing cyanide will greatly endanger the health of silver-plati...

AI Technical Summary

Problems solved by technology

[0003] The silver plating solution is an indispensable factor in the silver plating process. The performance of the silver plating solution directly affects the quality of the silver plating layer. At present, the most commonly used silver plating solution in the silver plating process is cyanide-containing Because cyanide is a highly toxic substance, this silver-plating solution containing cyanide will greatly endanger the health of silver-plating workers; and the cyanide-free silver-plating solution commonly used in the market The composition is relatively simple, and the silver plating layer electroplated with this silver plating solution is not dense, uneven, weak in adhesion, low in hardness, and will appear darkening and browning