Pitting at inclusions of the equiatomic CoCrFeMnNi alloy and improving corrosion resistance by potentiodynamic polarization in H2SO4

Li Pao; Izumi Muto; Yu Sugawara

doi:10.1016/j.corsci.2021.109748

Pitting at inclusions of the equiatomic CoCrFeMnNi alloy and improving corrosion resistance by potentiodynamic polarization in H₂SO₄

Li Pao, Izumi Muto, Yu Sugawara

ENG - Materials Science

Tohoku University

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

30 Citations (Scopus)

Abstract

The pitting initiation site of an arc-melted equimolar CoCrFeMnNi alloy was investigated, and a method to improve the pitting corrosion resistance of the alloy was proposed. Cr–Mn–O inclusions with S-containing segments on the outer sections were observed; these S-containing segments served as the pitting initiation sites. The S-containing inclusions were removed by potentiostatic polarization and immersion in H₂SO₄, but pitting corrosion resistance after treatment did not improve. By potentiodynamic polarization in H₂SO₄, the S-containing inclusions were removed and the passive film on the alloy matrix became Cr enriched, resulting in a significant improvement in the pitting corrosion resistance.

Original language	English
Article number	109748
Journal	Corrosion Science
Volume	191
DOIs	https://doi.org/10.1016/j.corsci.2021.109748
Publication status	Published - 2021 Oct

Keywords

A. High-entropy alloys
B. AES
C. Non-metallic inclusions
C. Passivation
C. Pitting corrosion
C. Trenching

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10.1016/j.corsci.2021.109748

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title = "Pitting at inclusions of the equiatomic CoCrFeMnNi alloy and improving corrosion resistance by potentiodynamic polarization in H2SO4",

abstract = "The pitting initiation site of an arc-melted equimolar CoCrFeMnNi alloy was investigated, and a method to improve the pitting corrosion resistance of the alloy was proposed. Cr–Mn–O inclusions with S-containing segments on the outer sections were observed; these S-containing segments served as the pitting initiation sites. The S-containing inclusions were removed by potentiostatic polarization and immersion in H2SO4, but pitting corrosion resistance after treatment did not improve. By potentiodynamic polarization in H2SO4, the S-containing inclusions were removed and the passive film on the alloy matrix became Cr enriched, resulting in a significant improvement in the pitting corrosion resistance.",

keywords = "A. High-entropy alloys, B. AES, C. Non-metallic inclusions, C. Passivation, C. Pitting corrosion, C. Trenching",

author = "Li Pao and Izumi Muto and Yu Sugawara",

note = "Funding Information: This work was supported by a Grant-in-Aid for Scientific Research on the innovation area “Science of New-Class of Materials Based on Elemental Multiplicity and Heterogeneity (Grant Number: JP 18H05452 )” from the Ministry of Education, Culture, Sports, Science and Technology (MEXT, Japan) . Publisher Copyright: {\textcopyright} 2021 Elsevier Ltd",

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doi = "10.1016/j.corsci.2021.109748",

language = "English",

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T1 - Pitting at inclusions of the equiatomic CoCrFeMnNi alloy and improving corrosion resistance by potentiodynamic polarization in H2SO4

AU - Pao, Li

AU - Muto, Izumi

AU - Sugawara, Yu

N1 - Funding Information: This work was supported by a Grant-in-Aid for Scientific Research on the innovation area “Science of New-Class of Materials Based on Elemental Multiplicity and Heterogeneity (Grant Number: JP 18H05452 )” from the Ministry of Education, Culture, Sports, Science and Technology (MEXT, Japan) . Publisher Copyright: © 2021 Elsevier Ltd

PY - 2021/10

Y1 - 2021/10

N2 - The pitting initiation site of an arc-melted equimolar CoCrFeMnNi alloy was investigated, and a method to improve the pitting corrosion resistance of the alloy was proposed. Cr–Mn–O inclusions with S-containing segments on the outer sections were observed; these S-containing segments served as the pitting initiation sites. The S-containing inclusions were removed by potentiostatic polarization and immersion in H2SO4, but pitting corrosion resistance after treatment did not improve. By potentiodynamic polarization in H2SO4, the S-containing inclusions were removed and the passive film on the alloy matrix became Cr enriched, resulting in a significant improvement in the pitting corrosion resistance.

AB - The pitting initiation site of an arc-melted equimolar CoCrFeMnNi alloy was investigated, and a method to improve the pitting corrosion resistance of the alloy was proposed. Cr–Mn–O inclusions with S-containing segments on the outer sections were observed; these S-containing segments served as the pitting initiation sites. The S-containing inclusions were removed by potentiostatic polarization and immersion in H2SO4, but pitting corrosion resistance after treatment did not improve. By potentiodynamic polarization in H2SO4, the S-containing inclusions were removed and the passive film on the alloy matrix became Cr enriched, resulting in a significant improvement in the pitting corrosion resistance.

KW - A. High-entropy alloys

KW - B. AES

KW - C. Non-metallic inclusions

KW - C. Passivation

KW - C. Pitting corrosion

KW - C. Trenching

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DO - 10.1016/j.corsci.2021.109748

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VL - 191

JO - Corrosion Science

JF - Corrosion Science

M1 - 109748

ER -

Pitting at inclusions of the equiatomic CoCrFeMnNi alloy and improving corrosion resistance by potentiodynamic polarization in H₂SO₄

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Keywords

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