The role of corrosion-resistant alloying elements in passivity

K. Hashimoto; K. Asami; A. Kawashima; H. Habazaki; E. Akiyama

doi:10.1016/j.corsci.2006.05.003

The role of corrosion-resistant alloying elements in passivity

K. Hashimoto, K. Asami, A. Kawashima, H. Habazaki, E. Akiyama

IMR - Materials Design Division

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

139 Citations (Scopus)

Abstract

Passivity of alloys containing corrosion-resistant elements were reviewed. Chromium and valve metals except aluminum form stable oxyhydroxide films even in aggressive hydrochloric acids. Molybdenum forms a passive MoO₂ film in the active region of stainless steels and hence decreases the active dissolution current. In the passive region of transition metals and valve metals, molybdenum is generally in the transpassive state and dissolved. However, if the outer oxyhydroxide film is stable the inner MoO₂ film is protected by the outer oxyhydroxide film and the MoO₂ film acts as the effective barrier against diffusion of matters through the film. Thus the passive current density of 30Cr-2Mo ferritic stainless steel is more than two orders of magnitude lower than that of 30Cr steel without molybdenum in 1 M HCl.

Original language	English
Pages (from-to)	42-52
Number of pages	11
Journal	Corrosion Science
Volume	49
Issue number	1
DOIs	https://doi.org/10.1016/j.corsci.2006.05.003
Publication status	Published - 2007 Jan

Keywords

A. Alloy
C. Corrosion resistance
C. Passivity
C. Role of elements
C. Spontaneous passivation

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10.1016/j.corsci.2006.05.003

Cite this

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title = "The role of corrosion-resistant alloying elements in passivity",

abstract = "Passivity of alloys containing corrosion-resistant elements were reviewed. Chromium and valve metals except aluminum form stable oxyhydroxide films even in aggressive hydrochloric acids. Molybdenum forms a passive MoO2 film in the active region of stainless steels and hence decreases the active dissolution current. In the passive region of transition metals and valve metals, molybdenum is generally in the transpassive state and dissolved. However, if the outer oxyhydroxide film is stable the inner MoO2 film is protected by the outer oxyhydroxide film and the MoO2 film acts as the effective barrier against diffusion of matters through the film. Thus the passive current density of 30Cr-2Mo ferritic stainless steel is more than two orders of magnitude lower than that of 30Cr steel without molybdenum in 1 M HCl.",

keywords = "A. Alloy, C. Corrosion resistance, C. Passivity, C. Role of elements, C. Spontaneous passivation",

author = "K. Hashimoto and K. Asami and A. Kawashima and H. Habazaki and E. Akiyama",

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T1 - The role of corrosion-resistant alloying elements in passivity

AU - Hashimoto, K.

AU - Asami, K.

AU - Kawashima, A.

AU - Habazaki, H.

AU - Akiyama, E.

PY - 2007/1

Y1 - 2007/1

N2 - Passivity of alloys containing corrosion-resistant elements were reviewed. Chromium and valve metals except aluminum form stable oxyhydroxide films even in aggressive hydrochloric acids. Molybdenum forms a passive MoO2 film in the active region of stainless steels and hence decreases the active dissolution current. In the passive region of transition metals and valve metals, molybdenum is generally in the transpassive state and dissolved. However, if the outer oxyhydroxide film is stable the inner MoO2 film is protected by the outer oxyhydroxide film and the MoO2 film acts as the effective barrier against diffusion of matters through the film. Thus the passive current density of 30Cr-2Mo ferritic stainless steel is more than two orders of magnitude lower than that of 30Cr steel without molybdenum in 1 M HCl.

AB - Passivity of alloys containing corrosion-resistant elements were reviewed. Chromium and valve metals except aluminum form stable oxyhydroxide films even in aggressive hydrochloric acids. Molybdenum forms a passive MoO2 film in the active region of stainless steels and hence decreases the active dissolution current. In the passive region of transition metals and valve metals, molybdenum is generally in the transpassive state and dissolved. However, if the outer oxyhydroxide film is stable the inner MoO2 film is protected by the outer oxyhydroxide film and the MoO2 film acts as the effective barrier against diffusion of matters through the film. Thus the passive current density of 30Cr-2Mo ferritic stainless steel is more than two orders of magnitude lower than that of 30Cr steel without molybdenum in 1 M HCl.

KW - A. Alloy

KW - C. Corrosion resistance

KW - C. Passivity

KW - C. Role of elements

KW - C. Spontaneous passivation

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DO - 10.1016/j.corsci.2006.05.003

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JO - Corrosion Science

JF - Corrosion Science

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The role of corrosion-resistant alloying elements in passivity

Abstract

Keywords

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