Non-cyanide copper plating solution

Abstract

Cyanogen-free preplated copper solution belongs to the technical field of surface treatment electroplating. The solution adopts a nontoxic organic phosphine compound to replace cyanide as a complexing agent for the preplated copper, and is particularly suitable for preplated copper used to electroplate steel, aluminum, magnesium, zinc, titanium and titanium alloy. The cyanogen-free preplated copper solution has the following main technical characteristic that the solution consists of (a) one sort of copper sulphate, basic cupric carbonate or copper nitrate with the volume concentration of between 30 and 60 g / L; (b) one sort or two sorts of compounds selected from methylene diphosphonic acid, 1-hydroxyethylidene 1.1 diphosphonic acid and 1-hydroxybutyleneidene 1.1 diphosphonic acid with the volume concentration of between 120 and 160 g / L; (c) one sort or two sorts of compounds selected from methylamino dimethylene diphosphonic acid, hexamethylene diamine tetramethylene phosphonic acid and ethylenediamine tetramethylene phosphonic acid with the volume concentration of between 2 and 5 g / L; (d) one sort of potassium citrate, amine citrate or seignette salt with the volume concentration of between 6 and 12 g / L, and (e) polyethyleneimine alkyl slat or aliphatic amine ethoxy sulfonated substance (AESS) with the volume concentration of between 0.02 and 0.05 g / L. The cyanogen-free preplated copper solution has the characteristics of stable service performance, simple solution compositions, convenient maintenance, high safety, environmental protection, reliable plating coat binding and the like.

Description

Technical field [0001] The invention relates to a cyanide-free pre-copper plating solution, which belongs to the technical field of surface treatment electroplating. It uses a non-toxic organic phosphine compound instead of cyanide as a complexing agent for pre-plating copper, and is particularly suitable for treating steel, aluminum, magnesium, and zinc. , Pre-plated copper for titanium and its alloys for electroplating. Background technique [0002] In the background art, cyanide pre-copper plating electrolyte uses sodium cyanide or potassium cyanide as the complexing agent of copper ions, and the CN in the electrolyte - It forms a stable complex with monovalent copper ions for electrodeposition. The composition of the plating solution is simple, the maintenance is convenient, the plating adhesion is good, and there is no replacement of copper. Therefore, the cyanide pre-plating copper electrolyte is widely used in China Pre-plated copper for steel, aluminum, magnesium, zinc, t...

AI Technical Summary

Problems solved by technology

However, the cyanide pre-plating copper 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. The national "Clean Production Promotion Law" clearly stipulates that "cyanide-containing electroplating "

At present, China is actively exploring and researching new cyanide-free electroplating processes, such as SurTec864 imported from abroad, BH580 of Guangzhou Erqing Institute, and JH-250A of Guangzhou Jinhui Company. The process range is narrow, the operation and maintenance are cumbersome, and the formula and composition are basically not published. In view of this situation, we have developed a cyanide-free pre-plating copper solution