IMPROVEMENT OF ANTIBACTERIAL PROPERTY OF CU-CONTAINING STAINLESS STEEL OR WORKED ARTICLE THEREOF

摘要

PROBLEM TO BE SOLVED: To improve the antibacterial properties of a stainless steel or a worked article thereof in which a surface modified layer is formed by working or grinding. ;SOLUTION: A stainless steel contg. ≥0.3wt.% Cu is immersed in a soln. of pH ≤4 to remove a modified surface layer part, and a Cu-enriched surface layer part is exposed. To the soln. of pH ≥4, halogen ions, sulfide ions or the like may be added. The Cu-contg. stainless steel may be subjected to electrolytic treatment in the soln. of pH ≥4. By this treatment, a surface layer part with ≥0.10 atomic % Cu concn. is formed on the surface of the stainless steel. The surface modified layer is removed, and the surface layer part with ≥0.10 atomic % Cu concn. showing excellent antibacterial operation over a long period can be formed.;COPYRIGHT: (C)1997,JPO