非金属介在物の安定性と18-8鋼の耐食性に及ぼす介在物組成の影響

概要

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The stability of slufides and selenides consisting of various Cr concentration and the effect of the said stability on corrosion resistance of 18-8 stainless steel have been investigated. The composition of the sulfides and the selenides have been changed by varying Mn concentration of the steels.Both the sulfides and the selenides extracted from the steels were found to dissolve less with an increase of Cr concentration.In particular, the selenides did not dissolve in 3% NaCl solution at pH 2.Similarly, the polarization curves showed that the decomposition potential of the sulfides and selenides became nobler with increasing Cr concentration.Corrosion resistance of 18-8 steels containing more stable sulfides and selenides of high Cr concentration was superior to that of steels containing conventional MnS and MnSe.
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