Passivity of (Mn,Cr)S inclusions in type 304 stainless steel: The role of Cr and the critical concentration for preventing inclusion dissolution in NaCl solution

Masashi Nishimoto; Izumi Muto; Yu Sugawara; Nobuyoshi Hara

doi:10.1016/j.corsci.2020.109060

Passivity of (Mn,Cr)S inclusions in type 304 stainless steel: The role of Cr and the critical concentration for preventing inclusion dissolution in NaCl solution

Masashi Nishimoto, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

ENG - Materials Science

Tohoku University

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

19 Citations (Scopus)

Abstract

The quantitative effects of the Cr concentration in (Mn,Cr)S inclusions in stainless steel on the dissolution and surface oxide properties of inclusions were investigated by microscale polarization and Auger electron spectroscopy. The onset potential of inclusion dissolution increased with the Cr concentration and reached the transpassive region of stainless steel when the Cr/(Mn + Cr) ratio of the inclusions was greater than 0.5. The surface oxide layer on Cr-rich inclusions was thicker and more Cr-enriched than on Mn-rich inclusions. Increasing the Cr concentration improved the protective ability of the oxide layer, resulting in the prevention of inclusion dissolution and higher pitting potentials.

Original language	English
Article number	109060
Journal	Corrosion Science
Volume	176
DOIs	https://doi.org/10.1016/j.corsci.2020.109060
Publication status	Published - 2020 Nov

Keywords

Auger electron spectroscopy
Microscale polarization
Pitting corrosion
Spark plasma sintering
Stainless steel
Sulfide inclusion

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10.1016/j.corsci.2020.109060

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title = "Passivity of (Mn,Cr)S inclusions in type 304 stainless steel: The role of Cr and the critical concentration for preventing inclusion dissolution in NaCl solution",

abstract = "The quantitative effects of the Cr concentration in (Mn,Cr)S inclusions in stainless steel on the dissolution and surface oxide properties of inclusions were investigated by microscale polarization and Auger electron spectroscopy. The onset potential of inclusion dissolution increased with the Cr concentration and reached the transpassive region of stainless steel when the Cr/(Mn + Cr) ratio of the inclusions was greater than 0.5. The surface oxide layer on Cr-rich inclusions was thicker and more Cr-enriched than on Mn-rich inclusions. Increasing the Cr concentration improved the protective ability of the oxide layer, resulting in the prevention of inclusion dissolution and higher pitting potentials.",

keywords = "Auger electron spectroscopy, Microscale polarization, Pitting corrosion, Spark plasma sintering, Stainless steel, Sulfide inclusion",

author = "Masashi Nishimoto and Izumi Muto and Yu Sugawara and Nobuyoshi Hara",

note = "Funding Information: This work was supported by JSPS KAKENHI (grant Nos. JP17H01331 and JP17J03625 ). This work was also supported by the Program for Leading Graduate Schools, “Interdepartmental Doctoral Degree Program for Multi-dimensional Materials Science Leaders, Tohoku University,” MEXT, Japan . Publisher Copyright: {\textcopyright} 2020 The Authors",

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doi = "10.1016/j.corsci.2020.109060",

language = "English",

volume = "176",

journal = "Corrosion Science",

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T1 - Passivity of (Mn,Cr)S inclusions in type 304 stainless steel

T2 - The role of Cr and the critical concentration for preventing inclusion dissolution in NaCl solution

AU - Nishimoto, Masashi

AU - Muto, Izumi

AU - Sugawara, Yu

AU - Hara, Nobuyoshi

N1 - Funding Information: This work was supported by JSPS KAKENHI (grant Nos. JP17H01331 and JP17J03625 ). This work was also supported by the Program for Leading Graduate Schools, “Interdepartmental Doctoral Degree Program for Multi-dimensional Materials Science Leaders, Tohoku University,” MEXT, Japan . Publisher Copyright: © 2020 The Authors

PY - 2020/11

Y1 - 2020/11

N2 - The quantitative effects of the Cr concentration in (Mn,Cr)S inclusions in stainless steel on the dissolution and surface oxide properties of inclusions were investigated by microscale polarization and Auger electron spectroscopy. The onset potential of inclusion dissolution increased with the Cr concentration and reached the transpassive region of stainless steel when the Cr/(Mn + Cr) ratio of the inclusions was greater than 0.5. The surface oxide layer on Cr-rich inclusions was thicker and more Cr-enriched than on Mn-rich inclusions. Increasing the Cr concentration improved the protective ability of the oxide layer, resulting in the prevention of inclusion dissolution and higher pitting potentials.

AB - The quantitative effects of the Cr concentration in (Mn,Cr)S inclusions in stainless steel on the dissolution and surface oxide properties of inclusions were investigated by microscale polarization and Auger electron spectroscopy. The onset potential of inclusion dissolution increased with the Cr concentration and reached the transpassive region of stainless steel when the Cr/(Mn + Cr) ratio of the inclusions was greater than 0.5. The surface oxide layer on Cr-rich inclusions was thicker and more Cr-enriched than on Mn-rich inclusions. Increasing the Cr concentration improved the protective ability of the oxide layer, resulting in the prevention of inclusion dissolution and higher pitting potentials.

KW - Auger electron spectroscopy

KW - Microscale polarization

KW - Pitting corrosion

KW - Spark plasma sintering

KW - Stainless steel

KW - Sulfide inclusion

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DO - 10.1016/j.corsci.2020.109060

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JO - Corrosion Science

JF - Corrosion Science

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Passivity of (Mn,Cr)S inclusions in type 304 stainless steel: The role of Cr and the critical concentration for preventing inclusion dissolution in NaCl solution

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Keywords

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