Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 25, Issue 4, Pages 1341-1351Publisher
ELSEVIER
DOI: 10.1016/S1003-6326(15)63733-5
Keywords
high-entropy alloy; high temperature oxidation; polarization; electrochemical impedance spectroscopy (EIS)
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Funding
- National Natural Science Foundation of China [51134013, 51171037, 51101024]
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The oxidation behaviors of high-entropy alloys AlxCoCrFeNi (x=0.15, 0.4) in supercritical water at 550 and 600 degrees C were studied, and compared with HR3C steel. All oxide films formed on alloys are composed of spinel type (Fe, Cr)(3)O-4 oxides. Compared with the oxide film on HR3C steel, thinner oxide films with smaller size of oxide particles were realized on Al0.15CoCrFeNi and Al0.4CoCrFeNi, indicating a superior oxidation resistance of Al0.15CoCrFeNi and Al0.4CoCrFeNi to HR3C steel. Electrochemical test results reveal that surface oxide films greatly affect the electrochemical corrosion behavior of the oxidized alloys in 3.5% NaCl solution. The relatively high corrosion resistance of oxidized Al0.15CoCrFeNi and HR3C is attributed to the formation of thick and multi-layer oxides.
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