Non-cyanogen strike copper plating technique

Abstract

The invention relates to a process method for preplating copper without cyanide, which belongs to the technical field of surface treatment plating, and can be widely applied to the preplating of bottom copper when steel, aluminum, magnesium, zinc, titanium and alloy thereof and other metals are plated. The method comprises cleaning before preplating, preplating copper and preplating post-treatment. The method is technically characterized in that the pH value of non-cyanide plating solution is controlled in a range of between 9 and 10.5; the temperature is controlled at between 15 and 45 DEG C; a part to be plated is electrified to be fed into a tank; when the part is fed in the tank, current density of the part is more than one third to one half of the prior plating current density (0.3 to 2.0 ampere / decimeter<2>) for 1 to 2 minutes of strike plating so as to improve the surface active potential of the part to be plated; the part to be plated is subjected to chemical etching before preplating, and is subjected to activation with 10 percent of sulfuric acid after preplating. The method has the advantages of simple process, convenient maintenance, flexible plating coat, corrosion resistance, low porosity, fine crystallization, reliable combination and the like.

Description

technical field [0001] The invention relates to a cyanide-free copper pre-plating process, belonging to the technical field of surface treatment electroplating, which can be widely used in the electroplating of metals such as steel, aluminum and aluminum alloys, magnesium and magnesium alloys, zinc and zinc alloys, titanium and titanium alloys, etc. Pre-plating of underlying copper. Background technique [0002] At present, the domestic electroplating industry widely uses cyanide electrolyte to pre-plate copper on base metals (steel, aluminum, magnesium, zinc, titanium and their alloys, etc.). The cyanide electrolyte will produce highly toxic cyanide in a high temperature environment, which is harmful to the human body and seriously damages the ecological environment. The national "Clean Production Promotion Law" clearly stipulates that "cyanide-containing electroplating" should be eliminated within a time limit, and new cyanide-free electroplating processes should be activ...

AI Technical Summary

Problems solved by technology

In the background technology, the domestic electroplating industry has gradually begun to adopt the cyanide-free pre-copper plating method, but currently there are disadvantages such as poor process performance, narrow process range, cumbersome operation and maintenance, and unreliable coating bonding.