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Abstract The effect of nitrogen on the pitting resistance of duplex stainless steel was studied with immersion test, electrochemical measurements and surface analysis techniques. The results indicated that the addition of nitrogen into the duplex steel shifts its pitting potential towards more positive direction, favours austenite with higher contents of Cr, Mo and Si, and hence improves the composition partition in the duplex. Nitrogen enhances the enrichment of Cr and Mo in the passive film, especially for the film formed on austenite, so that the stability of passive film is increased.
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Received: 25 August 1992
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[5] 藤井哲雄,防食技术,24,183(1975)
[6] Truman,J.E.,Coleman,M.J.,Pirt,K.R.,Brit.Corros.J.,12,236(1977) |
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