Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 891, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.161822
Keywords
Plastic deformation; High entropy alloy; Dislocations; Passive behavior; Space charge layer
Categories
Funding
- National Natural Science Foundation of China [51675201, 5180518]
- Hubei Provincial Natural Science Foundation of China [2018CFA003]
- Analytical and Testing Center of Huazhong University of Science and Technology
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Plastic deformation weakens the protective ability of the passive film, increases electrochemical dynamics and galvanic corrosion rate, consequently lowering the corrosion resistance of CrCoFeMnNi high entropy alloy.
In this research, the influence of plastic deformation on the corrosion behaviors of CrCoFeMnNi high entropy alloy were comprehensively investigated. As the degree of plastic deformation increases, both the acceptor density of the passive film and the thickness of the space charge layer increase, while the resistance of the passive film gradually weakens. The Fe and Cr oxides on the passive films decrease with the increasing plastic deformation degree, resulting in the weaker resistance of the passive film. Numerous dislocations formed after plastic deformation promote the increase of electrochemical dynamics and galvanic corrosion rate. Therefore, severe plastic deformation lowers the corrosion resistance of the alloy. (c) 2021 Elsevier B.V. All rights reserved.
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