Electrochemical copper removing solution

Abstract

The present invention relates to a solution for electrochemistry copper stripping, belongs to the chemical field, and is characterized in that said electrochemistry copper stripping solution contains a complexant of ethylene diamine of 100-300 g / L, a corrosion inhibitor of triethanolamine of 40-120 g / L and of erinitrit of 50-150 g / L, and an electrolyte of potassium nitrate of 50-150 g / L.The invention possesses the advantages that the discharging problem of Cr6+ containing waster water does not exist in the copper layer stripping by using said copper stripping solution, non-corroding on matrix metal occurs, the electrical current efficiency is high, the copper stripping time is shout, the productivity effect is high, and the adjustment and regeneration of the copper stripping solution is convenient.

Description

technical field [0001] The invention relates to a solution for electrochemical copper removal, which belongs to the field of chemistry. Background technique [0002] The removal of the copper plating layer can generally be divided into chemical methods and electrochemical methods. The chemical methods for removing the copper plating layer mainly include the following: 1) the method based on chromic anhydride; 2) sodium m-nitrobenzene sulfonate and NaCN-based and heating method; 3) concentrated HNO 3 method; 4) H 2 o 2 - Ammonium citrate method. Cr in these methods 6+ 、CN - , Harmful to human body, concentrated HNO 3 There is yellow smoke polluting the environment, and it is easy to corrode the substrate, while H 2 o 2 --The ammonium citrate method takes a long time to remove copper, the production efficiency is low, the solution stability is poor, and the cost is high. [0003] There are several electrochemical methods for removing the co...

AI Technical Summary

Problems solved by technology

Method 1) with Cr 6+ waste water, the problem that the country prohibits discharge; method 2), 3) although solve the problem of environmental protection discharge, but citric acid-NaNO 2 The service life is short, and the substrate is easy to be corroded after the copper stripping ability is reduced; the current efficiency of the ammonia salt copper stripping solution currently used is low, the copper stripping time is long, and the production efficiency is low, which cannot meet the needs of actual production