オーステナイト系ステンレス鋼におけるカソード還元処理の応力腐食割れ感受性に対する影響について

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In this study,in order to control artificially the inhomogeneity of the passive film of austenitic stainless steel SUS 304,a cathodic reduction treatment was conducted in boiling 42% magnesium chloride aqueous solution at 416±0.5K. To see how these inhomogeneities change depending upon cathodic reduction treatment,the morphology of the corroded surface of specimens were observed. In this way,the effect of cathodic reduction treatment on the stress corrosion cracking susceptibility of test materiel was investigated. At the same time,the change of character of passive film with cathodic reduction treatment,which is deeply associated with the susceptibility of this material to the stress corrosion cracking,was studied through examination of physical properties. Namely,the hardness of its surface layer was determined and its structural change was inspected by the electron spectroscopy far chemical analysis (XPS). Then,the stress corrosion cracking tests were performed in a wide stress range from near the threshould stress to 0.2% proof stress,where no plastic deformation occurred macroscopically either in the untreated specimen or in the specimens cathodic reduction treated to various degrees in the same environment. As the results,it was shown that the difference of the current density used for the cathodic reduction treatment affected the inhomogenity of the passive film. In addition,the change in stress corrosion cracking susceptibility was recongnized depending upon cathodic reduction treatment conditions. Thus, it is clear that this fact can be explained well by local corrosion susceptibility and the resistance to deformation of passive film.
社団法人日本材料学会の論文
1986-12-15

オーステナイト系ステンレス鋼におけるカソード還元処理の応力腐食割れ感受性に対する影響について

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