METHOD FOR QUANTITATIVELY ANALYZING ORGANIC ADDITIVE IN STAINLESS STEEL ACID-CLEANING LIQUID AND METHOD FOR ACID-CLEANING STAINLESS STEEL USING SAME

摘要

PROBLEM TO BE SOLVED: To provide a method for quantitatively analyzing organic additives in a stainless steel acid-cleaning liquid for capable of speedily quantitatively analyzing an acid-cleaning accelerator containing an organic compound having mercapto groups and an organic compound having disulfide bonds added to an acid-cleaning liquid for stainless steel by a simple method and a method for acid-cleaning stainless steel using the same method. SOLUTION: An organic additive preferably containing an organic compound having mercapto groups and/or an organic compound having disulfide bonds in a non-oxidizing acid-cleaning liquid for stainless steel is oxidized with permanganic acid ions, and determination is performed on the basis of the amount of consumed permanganic acid ions. Or the above-mentioned organic additive is oxidized with nichrome acid ions, and determination is performed on the basis of the amount of generated Cr3+ in a method for quantitatively analyzing an organic additive in a stainless steel acid-cleaning liquid and a method for acid-cleaning stainless steel using the same method for quantitative analysis.