Pre-coppering solution

Abstract

The invention discloses a pre-coppering solution which is composed of the following components: 22-55g / L of copper sulphate, 120-150g / L of methylene diphosphonic acid or 1-hydroxyl methylene 1.1 diphosphonic acid, 8-15g / L of one of potassium citrate, ammonium citrate and sodium potassium tartrate tetrahydrate, and 0.05-0.2g / L of auxiliary. The pre-coppering solution disclosed by the invention has the advantages that cyanide is completely replaced with an organic phosphoric compound; harm to a human body and severe pollution to the environment, caused by cyanide generated in the electroplating process, are eliminated; clean production is realized; and the pre-coppering solution disclosed by the invention has the advantages of being simple in component, reliable in combination of coppered layers, steady in property and stored for a long time.

Description

technical field

[0001] The invention relates to a copper preplating solution, which belongs to the technical field of surface treatment electroplating. Background technique

[0002] The cyanide electroplating copper electrolyte uses sodium cyanide or potassium cyanide as a complexing agent for copper ions. CN and monovalent copper ions in the electrolyte form a stable complex for electrodeposition. The composition of the plating solution is simple and easy to maintain. , the coating has good adhesion and will not replace copper. Therefore, the cyanide electroplating copper electrolyte is widely used in electroplating copper for steel, aluminum, magnesium, zinc, titanium and their alloys in China. However, the cyanide electroplating copper plating electrolyte will release highly toxic cyanide in a high-temperature working environment, which is harmful to the human body and causes serious damage to the ecological environment. Domestic companies are vigorously developing an alt...