Electropolishing liquid and electropolishing method of stainless steel using it, and manufacturing method of stainless steel with excellent corrosion resistance

摘要

PROBLEM TO BE SOLVED: To propose a new electrolytic polishing liquid and an electrolytic polishing method having excellent surface smoothness of stainless steel in an electrolytic polishing treatment which is a pretreatment for forming an immobilized film. An electrolytic polishing solution for stainless steel composed of only phosphoric acid and at least one organic sulfonic acid, wherein the phosphoric acid concentration is 25 to 50 vol% and the organic sulfonic acid concentration is 50 to 75 vol%. Is. A pulse voltage application process and a micro aeration process can be used in combination with the electrolytic polishing process. The method for producing corrosion-resistant stainless steel coated with a passivation film is an electrolytic polishing process of electrolytic polishing with an electrolytic polishing solution for stainless steel consisting of only phosphoric acid and at least one organic sulfonic acid, and a passivation treatment step. However, it is characterized in that at least two or more independent passivation treatment steps are sequentially performed. [Selection diagram] Fig. 3