Method for direct copper non-cyanide plating of zinc alloy casting die

Abstract

The invention discloses a copper plating method of zinc alloy casting piece, which comprises the following steps: a. electrolyzing cathode to remove oil; b. activating through washing by organic acid; c. immersing in the organic acid; d. plating copper directly with bivalent copper ion density at 10-25g / L and complexing agent density at 120-350 g / L, potassium carbonate density at 10-50g / L and hydroperoxide density at 1-15mL / L; maintaining pH value between 9 and 12; adjusting pH value through 50% potassium hydroxide solution; setting the current density of cathode 0.5-2.5A / dm2 at 20-50 deg.c.

Description

technical field

[0001] The invention relates to a method for electroplating copper. Specifically relates to a method for direct cyanide-free electroplating copper on zinc alloy die castings, which can be used for direct copper preplating of zinc alloy die castings and thickening of electroplated copper layers. Background technique

[0002] Zinc alloy has good casting properties and is an excellent casting alloy. It is more superior when used to cast workpieces with complex shapes and high precision. Zinc alloy die castings are increasingly used in automobiles, electronics, aerospace and other fields. However, cast zinc alloys are not wear-resistant and are easily corroded by humid atmospheres. In order to overcome the above shortcomings, zinc alloys are usually electroplated with single metals or alloys to improve their performance. The electroplated copper coating has the advantages of compactness, brightness, and good ductility. It is generally used as the bottom layer of...