Blackening solution and cyanide-free zinc-plating cadmium-free electroplating blackening technology

Abstract

The invention relates to the technical field of rolled copper foil processing technologies, and discloses a blackening solution and a cyanide-free zinc-plating cadmium-free electroplating blackening technology. According to the blackening solution, water is adopted as a solvent, and the blackening solution comprises the following components including, by mass concentration, 20 g / L-30 g / L of zinc sulfate, 20 g / L-30 g / L of of zinc chloride, 10 g / L-30 g / L of potassium pyrophosphate, 5 g / L-20 g / L of sodium ethylene diamine tetracetate, 30 g / L-40 g / L of boric acid, 5 g / L-15 g / L of didodecyl dimethyl ammonium chloride, 10 g / L-20 g / L of didodecyl dimethyl ammonium bromide and a surface active additive. The cyanide-free zinc-plating cadmium-free electroplating blackening technology is provided and is used for solving the problems that an existing rolled copper foil blackening technology flow is too complex, and a blackening solution of the existing rolled copper foil blackening technology flow contains chromium which seriously pollutes the environment.

Description

technical field [0001] The invention relates to the technical field of rolling copper foil processing technology, in particular to a blackening solution and a blackening process of cyanide-free zinc-plating and cadmium-free electroplating. Background technique [0002] In recent years, calendered copper foil products have become the most basic material for flexible printed circuit boards due to their good physical properties such as good ductility and high folding resistance, and are mainly used in flexible circuit boards and high-frequency circuit boards. . In order to meet the heat resistance, corrosion resistance and solderability requirements of the copper foil of the circuit board, the surface of the rolled copper foil needs to be treated, that is, blackening treatment and reddening treatment. The reddish-treated rolled copper foil basically copies the surface treatment method of electrolytic copper foil, but the peeling resistance and etching properties of the reddish...

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a blackening solution and cyanide-free zinc-plating and cadmium-free electroplating blackening process, which are used to solve the problem that the existing rolling copper foil blackening process is too complicated, and the blackening solution contains serious pollution to the environment. chrome problem

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