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

Yasushi Kato; Masahiro Hirano; Osamu Furukimi; Takumi Ujiro

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

Yasushi Kato, Masahiro Hirano, Osamu Furukimi, Takumi Ujiro

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Pages (from-to)	417-421
Number of pages	5
Journal	Review of Automotive Engineering
Volume	28
Issue number	3
Publication status	Published - Jul 1 2007

All Science Journal Classification (ASJC) codes

Automotive Engineering

Cite this

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title = "Effects of alloying elements on NaCl-induced hot corrosion resistance of stainless steels",

abstract = "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.",

author = "Yasushi Kato and Masahiro Hirano and Osamu Furukimi and Takumi Ujiro",

year = "2007",

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T1 - Effects of alloying elements on NaCl-induced hot corrosion resistance of stainless steels

AU - Kato, Yasushi

AU - Hirano, Masahiro

AU - Furukimi, Osamu

AU - Ujiro, Takumi

PY - 2007/7/1

Y1 - 2007/7/1

N2 - 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.

AB - 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.

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ER -

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

Abstract

All Science Journal Classification (ASJC) codes

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