Multiphase coupling corrosion mechanism of the AlNiZrYCo high-entropy metallic glass coating prepared by plasma spraying.

The AlNiZrYCo high-entropy metallic glass (HEMG) coating with an amorphous content of 60 % was prepared by supersonic plasma spraying, and its multiphase coupling corrosion mechanism was investigated. Due to the presence of amorphous phase and passivation elements, the formation of a passive film that was abundant in Co elements on the surface of the coating efficiently inhibited Cl- erosion. The existence of crystalline and oxide phases in the coating led to galvanic corrosion, accelerating the corrosion process of the coating. • A novel AlNiZrYCo high-entropy metallic glass coating was designed and prepared. • The amorphous content of the AlNiZrYCo high-entropy metallic glass coating can be up to 60 %. • Passive film of the AlNiZrYCo coating efficiently inhibited Cl- erosion. • The existence of crystalline and oxide phases in the coating lead to galvanic corrosion. [ABSTRACT FROM AUTHOR]