The evolution of passivity of the multi-principal element alloy (MPEA) CoCrFeNi was studied as a function of potential, pH, and exposure duration in 0.1 M NaCl. It was shown that CoCrFeNi exhibits excellent passivity irrespective of pH, revealing a multi-oxide passive film enriched with Cr(III) oxide. Electrochemical impedance spectroscopy suggests that the passive film thickness and polarization resistance increase with increasing pH and exposure duration, whereby the growth behavior of the passive film was consistent with the assumptions of the point defect model. X-ray photoelectron spectroscopy analysis suggested that the fraction of Co(II) and Ni(II) oxides in the passive film, and their contributions to the passivity of the alloy, increased with increase in pH of the electrolyte. The present work explores the complex synergy between composition, thermodynamics, and kinetics on the resultant passivity of a MPEA.
Skip Nav Destination
Article navigation
1 January 2022
Research Article|
October 14 2021
Evolution of Passivity for the Multi-Principal Element Alloy CoCrFeNi with Potential, pH, and Exposure in Chloride Solution
S. Choudhary;
S. Choudhary
‡
*Department of Materials Science and Engineering, Monash University, Clayton, VIC 3800, Australia.
Search for other works by this author on:
N. Birbilis;
N. Birbilis
**College of Engineering and Computer Science, Australian National University, Acton, ACT 2601, Australia.
Search for other works by this author on:
S. Thomas
S. Thomas
*Department of Materials Science and Engineering, Monash University, Clayton, VIC 3800, Australia.
Search for other works by this author on:
CORROSION (2022) 78 (1): 49–57.
Citation
S. Choudhary, N. Birbilis, S. Thomas; Evolution of Passivity for the Multi-Principal Element Alloy CoCrFeNi with Potential, pH, and Exposure in Chloride Solution. CORROSION 1 January 2022; 78 (1): 49–57. doi: https://doi.org/10.5006/3902
Download citation file:
Sign in
Don't already have an account? Register
Client Account
You could not be signed in. Please check your email address / username and password and try again.
Could not validate captcha. Please try again.
Sign in via your Institution
Sign in via your InstitutionCiting articles via
Long-Term Performance of Ag/AgCl Reference Electrodes for Corrosion Potential Monitoring in Radioactive Tank Waste at the Hanford Site
Sheewa Feng, Sandeep Chawla, Doug Frye, Kenneth Evans, Narasi Sridhar
The Effect of Heat Treatment and Build Orientation on the Susceptibility of Laser Powder Bed Fusion Additively Manufactured Alloy 625 to Crevice Corrosion
Y. Shorrab, J.J. Blecher, R.S. Lillard
Efficiency of Volatile Corrosion Inhibitors in the Presence of n-Heptane: An Experimental and Molecular Simulation Study
Maryam Eslami, Sumit Sharma, David Young, Marc Singer
Importance of Location for Addition of Surfactant Inhibitors in Corrosion Experiments
Kushal Singla, Bruce Brown, Srdjan Nešić
Understanding of Corrosion Inhibitor Dispersion Process in Water through Interaction between Stearic Acid and Alkane
Susumu Hirano, Tatsuya Sei, Midori Kawasaki, Atsushi Kobayashi, Tomokazu Yasuike