The paper systematically studied the effect of AC density on corrosion resistance of FeCoNi HEA in simulated Golmud soil solution. The results imply that the applied iAC seriously decreases the anticorrosion property of the HEA. In particular, under high AC density, the active state is presented and the corrosion characteristic changes from slightly local pitting to uneven overall corrosion with massive large-sized corrosion pits. Moreover, after imposed AC of 100 A/m2, the honeycomb holes are produced within passive film, which suggests that AC severely damages the film integrity, and reduces the protection and stability of the film. This phenomenon is due to the reason that as iAC rises, more generated hydrogen ions/atoms and Cl- are absorbed on the defect regions of passive film, significantly promoting the film dissolution, and facilitating the pitting initiation and development.

来源平台：JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE