Cyanide-free electroplating brass liquid and application method thereof

Abstract

The invention belongs to the technical field of electroplating, and in particular, relates to cyanide-free electroplating brass liquid and an application method thereof. The cyanide-free electroplating brass liquid, with de-ionized water as solvent, comprises 15-35 g / L of copper sulfate, 8-20 g / L of zinc sulfate, 120-200 g / L of pyrophosphate, 10-20 g / L of auxiliary complexing agent, 1-3 g / L of pHadjusting agent, 20-40 g / L of electric conducting agent, 0.01-0.02 g / L of main brightening agent, 0.001-0.1 g / L of auxiliary brightening agent, and 0.1-1 g / L of methyl gluceth. Through feeding of themethyl gluceth, obtained brass plating layers are uniform in color and compact, the problems of difficult color control of the plating layers and narrow current density range with pyrophosphate as cyanide-free electroplating liquid complexing agents are overcome, and the electroplating efficiency is improved. The electroplating brass liquid is safe, environment-friendly and excellent in electroplating effect, and facilitates popularization and utilization of electroplating brass.

Description

Technical field [0001] The invention belongs to the technical field of electroplating, and specifically relates to a cyanide-free brass electroplating liquid and a method of using the same. Background technique [0002] Brass is an alloy composed of copper and zinc. Its golden color is similar to gold, which reduces the cost of gold decoration and is an ideal surface decoration material. The surface of objects is often decorated with plating solutions containing Cu-Zn alloys. In the electroplating process of brass, it is divided into two categories: cyanide-containing and cyanide-free. The brass coating obtained by electroplating brass with cyanide-containing electroplating solution has good adhesion, fine crystallization and wide application. However, the cyanide-containing electroplating solution is highly toxic. Substances that easily decompose to produce hydrogen cyanide gas. Once absorbed by the human body, it cannot be treated and poses a serious threat to the lives o...

AI Technical Summary

Problems solved by technology

However, most ionic liquids are very easy to absorb water, so strict dehydration and oxygen removal are required during the electrodeposition process, and the cost of synthesizing ionic liquids is high, and the application range is limited.

[0004] In order to solve the problems of unstable quality and narrow current density range of electroplated brass in the pyrophosphate system, an economical and environmentally friendly electroplating brass solution with good electroplating effect and its use method are provided

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