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Title: Localized Corrosion Behavior of Non-Equiatomic NiFeCrMnCo Multi-Principal Element Alloys

Abstract

A series of single phase Ni38Fe20CrxMn21–0.5xCo21–0.5x multi-principal element alloys (MPEAs) were fabricated and their localized corrosion behavior was tested in 0.6 M NaCl solution. These MPEAs were found to be susceptible to localized corrosion, exhibiting pitting at room temperature, as indicated by positive hysteresis loops and low repassivation potentials observed in cyclic potentiodynamic polarization experiments. The pitting resistance increased with increasing Cr content. Interestingly, even the MPEAs with low chromium content, Ni38Fe20Cr6Mn18Co18 and Ni38Fe20Cr10Mn16Co16, exhibited passivity and localized corrosion. Here, the passivity observed in these low chromium MPEAs is likely derived from their relatively high nickel content. Crystallographic pit morphology was observed in most of these MPEAs, suggesting the absence of a salt film on the dissolving pit surface. Such crystallographic pit morphology indicates that the pit growth in most of these MPEAs was under charge-transfer/ohmic control.

Authors:
 [1];  [1];  [1];  [2]; ORCiD logo [2];  [1]
  1. Ohio State University, Columbus, OH (United States)
  2. University of Virginia, Charlottesville, VA (United States)
Publication Date:
Research Org.:
The Ohio State Univ., Columbus, OH (United States); Univ. of Virginia, Charlottesville, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1668048
Alternate Identifier(s):
OSTI ID: 1639117
Grant/Contract Number:  
SC0016584
Resource Type:
Accepted Manuscript
Journal Name:
Electrochimica Acta
Additional Journal Information:
Journal Volume: 354; Journal ID: ISSN 0013-4686
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Multi-principal element alloys; Pitting corrosion; Crystallographic pit morphology

Citation Formats

Sahu, Sarita, Swanson, Orion J., Li, Tianshu, Gerard, Angela Y., Scully, John R., and Frankel, Gerald S. Localized Corrosion Behavior of Non-Equiatomic NiFeCrMnCo Multi-Principal Element Alloys. United States: N. p., 2020. Web. doi:10.1016/j.electacta.2020.136749.
Sahu, Sarita, Swanson, Orion J., Li, Tianshu, Gerard, Angela Y., Scully, John R., & Frankel, Gerald S. Localized Corrosion Behavior of Non-Equiatomic NiFeCrMnCo Multi-Principal Element Alloys. United States. https://doi.org/10.1016/j.electacta.2020.136749
Sahu, Sarita, Swanson, Orion J., Li, Tianshu, Gerard, Angela Y., Scully, John R., and Frankel, Gerald S. Sat . "Localized Corrosion Behavior of Non-Equiatomic NiFeCrMnCo Multi-Principal Element Alloys". United States. https://doi.org/10.1016/j.electacta.2020.136749. https://www.osti.gov/servlets/purl/1668048.
@article{osti_1668048,
title = {Localized Corrosion Behavior of Non-Equiatomic NiFeCrMnCo Multi-Principal Element Alloys},
author = {Sahu, Sarita and Swanson, Orion J. and Li, Tianshu and Gerard, Angela Y. and Scully, John R. and Frankel, Gerald S.},
abstractNote = {A series of single phase Ni38Fe20CrxMn21–0.5xCo21–0.5x multi-principal element alloys (MPEAs) were fabricated and their localized corrosion behavior was tested in 0.6 M NaCl solution. These MPEAs were found to be susceptible to localized corrosion, exhibiting pitting at room temperature, as indicated by positive hysteresis loops and low repassivation potentials observed in cyclic potentiodynamic polarization experiments. The pitting resistance increased with increasing Cr content. Interestingly, even the MPEAs with low chromium content, Ni38Fe20Cr6Mn18Co18 and Ni38Fe20Cr10Mn16Co16, exhibited passivity and localized corrosion. Here, the passivity observed in these low chromium MPEAs is likely derived from their relatively high nickel content. Crystallographic pit morphology was observed in most of these MPEAs, suggesting the absence of a salt film on the dissolving pit surface. Such crystallographic pit morphology indicates that the pit growth in most of these MPEAs was under charge-transfer/ohmic control.},
doi = {10.1016/j.electacta.2020.136749},
journal = {Electrochimica Acta},
number = ,
volume = 354,
place = {United States},
year = {Sat Jul 11 00:00:00 EDT 2020},
month = {Sat Jul 11 00:00:00 EDT 2020}
}

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