Open AccessCommunication—Dissolution and Passivation of a Ni-Cr-Fe-Ru-Mo-W High Entropy Alloy by Elementally Resolved Electrochemistry
Author(s) -
Xuejie Li,
Junsoo Han,
Ping Lü,
James E. Saal,
Gregory B. Olson,
G. S. Frankel,
John R. Scully,
Kévin Ogle
Publication year - 2020
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/ab7f86
Subject(s) - passivation , dissolution , alloy , corrosion , electrochemistry , materials science , open circuit voltage , polarization (electrochemistry) , metallurgy , carbonate , analytical chemistry (journal) , inorganic chemistry , electrode , chemistry , nanotechnology , physics , layer (electronics) , voltage , quantum mechanics , chromatography
The formation and dissolution of the passive film on a novel NiCrFeRuMoW high entropy alloy in H 2 SO 4 was measured with atomic emission spectroelectrochemistry. Passivation involved Cr and Ru enrichment, whether passivation was achieved spontaneously at open circuit or by potentiostatic step into the passive domain. The other elements, Ni, Fe, Mo, and W, dissolved at rates approximately proportional to their bulk concentrations. The air formed film showed only a Cr enrichment. Excellent corrosion resistance properties were indicated by spontaneous passivation, the low passive current in the polarization curve, and the absence of detectable elemental dissolution during the active peak.