Advances in experimental study and production practice of cyanide-free copper plating——Part II

The unfeasibility of dip plating of copper on iron and steel workpiece from a bright acid copper sulfate bath and the features of acid copper plating process characterized by the combination of dip plating with electrodeposition were analyzed. The latest progress in the studies of acid copper brightener, iron and steel activation principle, and complexing agent for cyanide-free alkaline copper plating were introduced. It is pointed out that cyanide-free HEDP copper plating bath has chemical activation effect and pre-dipping can improve the adhesion of deposit to substrate.