Examination of Electropolishing Conditions for SUS304 Stainless Steel by Wiping Method Using Phosphoric Acid-Sulfuric Acid Electrolyte

Electrolyte additives, applied voltage, and wiping speed were investigated to elucidate the optimum conditions for electropolishing of stainless steel（SUS304）using a method with an electrolyte-solution-impregnated felt wiper cathode. Adding viscosity improver surfactant electrolyte solution（mixed acid 98% sulfuric 85% phosphoric acid（1 : 3, v/v））reduced evolution pits on electropolished SUS304 surfaces caused by method, but it reduced polishing rate. Conditions higher voltage lower led increased rate decreased pit surface. Electropolishing using containing 8 V 10 mm s－1 produced extremely smooth high-gloss surfaces. Analysis glow discharge optical emission spectroscopy revealed that depth profile surface composition had Cr-rich layer formed method. The pitting potential shifted more positive value after That was comparable obtained conventional electropolishing.