Journal
APPLIED SURFACE SCIENCE
Volume 439, Issue -, Pages 533-544Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2018.01.047
Keywords
High-entropy alloy; AFM; Microstructure; Localized corrosion; Passive film
Categories
Funding
- U.S. Department of Energy, Basic Energy Sciences, Scientific User Facilities Division
- U.S. Department of Energy, Office of Fossil Energy, National Energy Technology Laboratory [DE-FE-0008855, DE-FE-0024054, DE-FE-0011194]
- National Science Foundation [DMR-1611180]
- 863 Program of China [2008AA031702, 2012AA03A507]
- Beijing Municipal Natural Science Foundation [2162026]
- China Scholarship Council
- Ministry of Science and Technology of Taiwan [MOST 105-2221-E-007-017-MY3]
- National Tsing Hua University, Taiwan
- Dalian University of Technology, China
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1611180] Funding Source: National Science Foundation
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In-situ electrochemical (EC)-AFM is employed to investigate the localized corrosion of the AlxCoCrFeNi high-entropy alloys (HEAs). Surface topography changes on the micro/sub-micro scale are monitored at different applied anodizing potentials in a 3.5 wt% NaCl solution. The microstructural evolutions with the increased Al content in the alloys are characterized by SEM, TEM, EDS and EBSD. The results show that by increasing the Al content, the microstructure changes from single solid-solution to multi-phases, leading to the segregations of elements. Due to the microstructural variations in the AlxCoCrFeNi HEAs, localized corrosion processes in different ways after the breakdown of the passive film, which changes from pitting to phase boundary corrosion. The XPS results indicate that an increased Al content in the alloys/phases corresponds to a decreased corrosion resistance of the surface passive film. (C) 2018 Elsevier B.V. All rights reserved.
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