METHOD FOR ELECTROLYTICALLY DESCALING COLD ROLLED STAINLESS STEEL STRIP WITH NEUTRAL SALT

摘要

PURPOSE:To effectively and continuously remove oxide scale on the surface of a steel sheet by successively causing cathode reaction and anode reaction on the surface of the steel sheet in an aq. neutral salt soln. having a specified concn. of sexivalent Cr ions and a specified pH. CONSTITUTION:A cold rolled stainless steel strip 3 is continuously passed through an aq. neutral salt soln. 4 having =8g/l concn. of sexivalent Cr ions and 2-6pH in an electrolytic cell 5. Cathode reaction is first caused once or plural times on the surface of the strip 3 with only anodes 1 and then anode reaction is caused once or plural times with only cathodes 2. The efficiency of descaling of the strip 3 by indirect electrolysis is increased, electric energy required is reduced and the electrolysis time is shortened.