| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface modification treatment method by which resistance against chlorine pitting corrosion and stress corrosion cracking property intrinsic to austenitic stainless steel and fatal general corrosion and rusting of martensitic stainless steel is prevented by subjecting austenitic stainless steel raw material used for various kinds of chemical plants and piping susceptible to corrosion trouble due to contact with chlorine gas and chlorine ion and kitchen sink or the like in daily personal life and martensitic stainless steel which features hardness as merit, however, is poor in corrosion resistance and is used for cutting knife, surgical instrument or the like to electrolytic treatment.SOLUTION: Surface modification treatment is performed which extremely improving resistance against chlorine pitting corrosion intrinsic to austenitic stainless steel and suppression of general corrosion and rusting which can be said as fate of the martensitic stainless steel by subjecting a stainless steel to electrolytic treatment with an electrolytic solution prepared by mixing a neutral salt containing a lithium compound, thereby, causing lithium or lithium and oxygen to diffuse or permeate in ion state over an inner part from a stainless steel surface layer part. |
