Effects of alloying elements on NaCl-induced hot corrosion resistance of stainless steels

Yasushi Kato, Masahiro Hirano, Osamu Furukimi, Takumi Ujiro

    研究成果: ジャーナルへの寄稿学術誌査読

    1 被引用数 (Scopus)

    抄録

    The mechanism of NaCl-induced hot corrosion and the effect of alloying elements were investigated in Nb-bearing ferritic stainless steels. The main results obtained were as follows: (1) Na4 promotes chloride-induced corrosion at elevated temperatures, because Cr2O3 formed at elevated temperature reacts with Na* and becomes Na2CrO4, which is soluble to water. This reaction exposes the chromium-depleted zone to the surface and hence accelerates the oxidation. (2) This type of corrosion resistance is improved by the addition of Mo. Mo precipitates at grain boundaries as Lavesphase as well as Nb. Precipitation of Laves phase, which suppresses the grain boundary diffusion of oxygen and likely improves NaCl-induced hot corrosion resistance.

    本文言語英語
    ページ(範囲)417-421
    ページ数5
    ジャーナルReview of Automotive Engineering
    28
    3
    出版ステータス出版済み - 7月 1 2007

    !!!All Science Journal Classification (ASJC) codes

    • 自動車工学

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