Abstract
Effect of passive potential on the protective capacity of passive film formed on CoCrFeMnNi high-entropy alloy was investigated in carbonate/bicarbonate solution by using electrochemical measurements, atomic force microscopy and x-ray photoelectron spectroscopy (XPS). The results reveal that the protective ability of passive film is sensitive to the applied potential, and the anti-corrosion property of passive film at high potential is significantly enhanced as indicated by the high film resistance and the low donor densities. The Cr2O3 content and the ratios of Mn/Mnox as well as O2−/OH− in the secondary passive film are greater than those in the primary passive film. Moreover, increasing the potential facilitates the formation of a homogeneous and thick passive film, which considerably improves the protective ability of the film.
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