The deplating solution is a layer of special metal or metal substance coating that can be effectively removed on the surface of the workpiece through immersion, heating, ultrasonic waves, electrolysis, etc., without affecting the workpiece substrate. Chemical liquid that does not dissolve, corrode or discolor.
Main information:
The formula of electrolytic stripping solution: generally consists of oxidants, complexing agents, buffers, corrosion inhibitors, etc.
Oxidant
The commonly used nitrate is nitrate, which is the main salt in the deplating solution. Since nitrate is an oxidant for metals such as copper, nickel, and chromium, it has an effect on these plated metals. Oxidation, so as to achieve the purpose of removing the coating, commonly used are ammonium nitrate, sodium potassium nitrate.
Buffers
Commonly used are acetate or boric acid.
Complexing agent
Nitrilotriacetic acid, disodium EDTA, sodium citrate, potassium tartrate and other substances. Triethanolamine, ethylenediamine, thiocyanate, etc. play an activation and coordination role.