Corrosion of Al xCoCrFeNi high-entropy alloys: Al-content and potential scan-rate dependent pitting behavior

Yunzhu Shi; Bin Yang; Xie Xie; Jamieson Brechtl; Karin A. Dahmen; Peter K. Liaw

doi:10.1016/j.corsci.2017.02.019

Corrosion of Al _xCoCrFeNi high-entropy alloys: Al-content and potential scan-rate dependent pitting behavior

Yunzhu Shi, Bin Yang, Xie Xie, Jamieson Brechtl, Karin A. Dahmen, Peter K. Liaw

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

Abstract

The present work investigates the influence of Al-content and potential-scan-rate on stable/metastable pitting of Al _xCoCrFeNi high-entropy alloys in a 3.5 wt.% NaCl solution. The increased Al content causes the volume fraction of the Cr-depleted phase to increase, resulting in thicker/dispersive passive films that degrade the localized corrosion resistance. The varied stable/metastable pitting behavior under different potential scan rates indicates that pit generation is influenced by the properties of passive films and the interactions between chloride ions and the active sites. Furthermore, a mean-field theory is employed to predict the scan-rate dependent, power-law distribution of current fluctuations.

Original language	English (US)
Pages (from-to)	33-45
Number of pages	13
Journal	Corrosion Science
Volume	119
DOIs	https://doi.org/10.1016/j.corsci.2017.02.019
State	Published - May 1 2017

Keywords

A. Alloy
B. Polarization
C. Passive films
C. Pitting corrosion

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
General Materials Science

Online availability

10.1016/j.corsci.2017.02.019

Library availability

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Cite this

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title = "Corrosion of Al xCoCrFeNi high-entropy alloys: Al-content and potential scan-rate dependent pitting behavior",

abstract = "The present work investigates the influence of Al-content and potential-scan-rate on stable/metastable pitting of Al xCoCrFeNi high-entropy alloys in a 3.5 wt.% NaCl solution. The increased Al content causes the volume fraction of the Cr-depleted phase to increase, resulting in thicker/dispersive passive films that degrade the localized corrosion resistance. The varied stable/metastable pitting behavior under different potential scan rates indicates that pit generation is influenced by the properties of passive films and the interactions between chloride ions and the active sites. Furthermore, a mean-field theory is employed to predict the scan-rate dependent, power-law distribution of current fluctuations.",

keywords = "A. Alloy, B. Polarization, C. Passive films, C. Pitting corrosion",

author = "Yunzhu Shi and Bin Yang and Xie Xie and Jamieson Brechtl and Dahmen, {Karin A.} and Liaw, {Peter K.}",

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T2 - Al-content and potential scan-rate dependent pitting behavior

AU - Shi, Yunzhu

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AU - Xie, Xie

AU - Brechtl, Jamieson

AU - Dahmen, Karin A.

AU - Liaw, Peter K.

PY - 2017/5/1

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AB - The present work investigates the influence of Al-content and potential-scan-rate on stable/metastable pitting of Al xCoCrFeNi high-entropy alloys in a 3.5 wt.% NaCl solution. The increased Al content causes the volume fraction of the Cr-depleted phase to increase, resulting in thicker/dispersive passive films that degrade the localized corrosion resistance. The varied stable/metastable pitting behavior under different potential scan rates indicates that pit generation is influenced by the properties of passive films and the interactions between chloride ions and the active sites. Furthermore, a mean-field theory is employed to predict the scan-rate dependent, power-law distribution of current fluctuations.

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