Effect of Insoluble Carbide on Crevice Corrosion Resistance for 13Cr Martensitic Stainless Steel

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  • １３Ｃｒマルテンサイト系ステンレス鋼における未固溶炭化物の耐すきま腐食性への影響
  • 13Cr マルテンサイトケイ ステンレス コウ ニ オケル ミコヨウ タンカブツ ノ タイスキマフショクセイ エ ノ エイキョウ

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As reported before, conventional group of flat heald, heald C, has used to serve for about two years, while a new group of flat heald, heald X, suffered significant localized corrosion earlier in one or two months. In this study, steel C’ of chemical composition similar to heald C is heat-treated to reproduce the heald C in terms of metallurgical characteristics (hardness Hv ; amount of insoluble carbide [MC]; prior austenite grain size dγ). The characteristics of heald C (484 Hv ; 1.2% ; 12 μm) is found to be reproduced by a solution-treatment at 1040°C for 180 s, WQ followed by tempering at 450°C for 20 s, AC. Those of heald X (474 Hv ; 2.0% ; 12 μm), lower in hardness and more in insoluble carbide than C, could be reproduced by solution-treatment at 1040°C for around 100 s, shorter time than heald C. The heat treatment condition determined as above is confirmed to corrode the steel C’ in 6.8 vol% HNO3 solution similarly in surface appearance to healds C and X. Their corrosion rates in the same solution vs. soluble Cr content, [Cr]relationship are nearly equal to the corrosion rates vs. [Cr] relationship for relevant solution-treated steels. The repassivation potential for crevice corrosion, ER.CREV, in 0.85, 2.8 or 28 mM NaCl solution depends also on [Cr], nearly constant between [Cr] range of 11.5 and 12.8%, and above which becomes more noble with increasing [Cr] up to 13.4%. Then, [Cr] values of 11.5% (heald X) and 12.5% (heald C) make no difference in ER.CREV. Real crevice corrosion for heald X was attributed to more noble spontaneous electrode potential, ESP, of heald X than ER.CREV under increased residual chlorine, as reported before.

Journal

  • Corrosion Engineering

    Corrosion Engineering 60 (10), 449-456, 2011

    Japan Society of Corrosion Engineering

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