Solution system for electrolytically removing titanium carbide coating and method for same

A solution system for removing titanium carbide coatings on substrate surface by two electrolysis steps, comprising:

• a first electrolyte solution for a first electrolysis step, the first electrolyte solution containing 2-80 g/L soluble alkali metal hydroxide and 5-100 g/L complexant capable of complexing with titanium ions;
• a second electrolyte solution a second electrolysis step, the second electrolyte solution containing 50-300 g/L soluble alkali metal hydroxide, 5-100 g/L complexant capable of complexing with titanium ions, and 10-60 g/L alkylol amine.

A method for removing a titanium carbide coating from a substrate, comprising:

• partially removing the titanium carbide coating by a first electrolysis step in a first electrolyte solution using the substrate as the anode, the first electrolyte solution containing containing 2-80 g/L soluble alkali metal hydroxide and 5-100 g/L complexant capable of complexing with titanium ions;
• and
• completely removing the remainder titanium carbide coating by a second electrolysis step in a second electrolyte solution using the substrate combined with the coating as the anode, the second electrolyte solution containing 50-300 g/L soluble alkali metal hydroxide, 5-100 g/L complexant capable of complexing with titanium ions, and 10-60 g/L alkylol amine.