Relationship between the microstructure and local corrosion properties of weld metal in austenitic stainless steels

Shun Tokita; Kota Kadoi; So Aoki; Hiroshige Inoue

doi:10.1016/j.corsci.2020.108867

Relationship between the microstructure and local corrosion properties of weld metal in austenitic stainless steels

Shun Tokita, Kota Kadoi, So Aoki, Hiroshige Inoue

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

15 Citations (Scopus)

Abstract

The purpose of this study is to evaluate the corrosion resistance of weld metal by electrochemical methods and discuss the relationship between microstructure and corrosion resistance. Intergranular and pitting corrosion resistances were measured using electrochemical potentiokinetic reactivation (EPR) test and pitting potential measurement respectively. The reactivation ratio and pitting potential corresponded to its chemical composition. The specimens containing more Cr and Mo showed higher resistance. In the EPR test, the dendrite core with a relatively low Cr content was corroded. In the pitting corrosion test, Nb carbide became the initiation site of pitting corrosion which propagated along the cell structure.

Original language	English
Article number	108867
Journal	Corrosion Science
Volume	175
DOIs	https://doi.org/10.1016/j.corsci.2020.108867
Publication status	Published - 2020 Oct
Externally published	Yes

Keywords

Intergranular corrosion
Pitting corrosion
Segregation
Stainless steel
Welding

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)
Materials Science(all)

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10.1016/j.corsci.2020.108867

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title = "Relationship between the microstructure and local corrosion properties of weld metal in austenitic stainless steels",

abstract = "The purpose of this study is to evaluate the corrosion resistance of weld metal by electrochemical methods and discuss the relationship between microstructure and corrosion resistance. Intergranular and pitting corrosion resistances were measured using electrochemical potentiokinetic reactivation (EPR) test and pitting potential measurement respectively. The reactivation ratio and pitting potential corresponded to its chemical composition. The specimens containing more Cr and Mo showed higher resistance. In the EPR test, the dendrite core with a relatively low Cr content was corroded. In the pitting corrosion test, Nb carbide became the initiation site of pitting corrosion which propagated along the cell structure.",

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T1 - Relationship between the microstructure and local corrosion properties of weld metal in austenitic stainless steels

AU - Tokita, Shun

AU - Kadoi, Kota

AU - Aoki, So

AU - Inoue, Hiroshige

PY - 2020/10

Y1 - 2020/10

N2 - The purpose of this study is to evaluate the corrosion resistance of weld metal by electrochemical methods and discuss the relationship between microstructure and corrosion resistance. Intergranular and pitting corrosion resistances were measured using electrochemical potentiokinetic reactivation (EPR) test and pitting potential measurement respectively. The reactivation ratio and pitting potential corresponded to its chemical composition. The specimens containing more Cr and Mo showed higher resistance. In the EPR test, the dendrite core with a relatively low Cr content was corroded. In the pitting corrosion test, Nb carbide became the initiation site of pitting corrosion which propagated along the cell structure.

AB - The purpose of this study is to evaluate the corrosion resistance of weld metal by electrochemical methods and discuss the relationship between microstructure and corrosion resistance. Intergranular and pitting corrosion resistances were measured using electrochemical potentiokinetic reactivation (EPR) test and pitting potential measurement respectively. The reactivation ratio and pitting potential corresponded to its chemical composition. The specimens containing more Cr and Mo showed higher resistance. In the EPR test, the dendrite core with a relatively low Cr content was corroded. In the pitting corrosion test, Nb carbide became the initiation site of pitting corrosion which propagated along the cell structure.

KW - Intergranular corrosion

KW - Pitting corrosion

KW - Segregation

KW - Stainless steel

KW - Welding

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DO - 10.1016/j.corsci.2020.108867

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JF - Corrosion Science

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Relationship between the microstructure and local corrosion properties of weld metal in austenitic stainless steels

Abstract

Keywords

ASJC Scopus subject areas

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