In-situ visualization of corrosion behavior of Al CoCrFeNi high-entropy alloys during electrochemical polarization

Shi, Yunzhu; Mo, Jingke; Zhang, Feng-Yuan; Yang, Bin; Liaw, Peter K.; Zhao, Ying

doi:10.1016/j.jallcom.2020.156014

Title: In-situ visualization of corrosion behavior of Al CoCrFeNi high-entropy alloys during electrochemical polarization

Journal Article · Wed Jun 24 00:00:00 EDT 2020 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2020.156014· OSTI ID:1849107

Shi, Yunzhu ^[1]; Mo, Jingke ^[2]; Zhang, Feng-Yuan ^[3]; Yang, Bin ^[4]; Liaw, Peter K. ^[5]; Zhao, Ying ^[6]

Chinese Academy of Sciences, Shenzhen (China)
Fudan Univ., Shanghai (China)
Univ. of Tennessee Space Inst. (UTSI), Tullahoma, TN (United States)
Univ. of Science and Technology Beijing (China). Collaborative Innovation Center of Steel Technology
Univ. of Tennessee, Knoxville, TN (United States)
Chinese Academy of Sciences, Shenzhen (China). Shenzhen Insts. of Advanced Technology

In this study, the corrosion behavior of the Al_xCoCrFeNi (x = 0.3, 0.5, 0.7) high-entropy alloys (HEAs) is investigated by an in-situ visualization system. Surface morphology changes on both micro-spatial and temporal scales are monitored in the 3.5 wt% NaCl solution during the potentiodynamic polarization. The microstructures of the Al_xCoCrFeNi HEAs are characterized by SEM, EBSD, and EDS. The results show that the microstructure evolves from singe face-centered cubic (FCC) phase to multi-phases by increasing the Al content. The in-situ observations directly reveal the different localized corrosion processes in the AlxCoCrFeNi HEAs. In the single FCC phase Al_0.3CoCrFeNi HEA, localized corrosion shows in the form of pitting. In the Al_0.5CoCrFeNi and Al_0.7CoCrFeNi alloys, which possess FCC and body-centered cubic (BCC) phases, the localized corrosion initiates and propagates in the Cr-depleted BCC phase. In addition, the in-situ visualization uncovers the evolution of current serration, which represents the propagation and repassivation of metastable pit during the polarization. The frequent occurrence of metastable pits indicates distinct repassivation ability of the Al_0.3CoCrFeNi HEA.

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Research Organization:: Univ. of Tennessee, Knoxville, TN (United States); Univ. of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE); USDOE Office of Fossil Energy and Carbon Management (FECM)

Grant/Contract Number:: FE0008855; FE0011194; FE0024054; FE-0008855; FE-0024054; FE-0011194; DMR-1611180; 1809640; 2162026

OSTI ID:: 1849107

Alternate ID(s):: OSTI ID: 1703744

Journal Information:: Journal of Alloys and Compounds, Vol. 844, Issue C; ISSN 0925-8388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: In-situ visualization of corrosion behavior of Al CoCrFeNi high-entropy alloys during electrochemical polarization

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