Research progress on the performance in erosion and cavitation environments of Fe-based amorphous coatings

This review presents the research advancements regarding the erosion and cavitation resistance of Fe-based amorphous coatings. It discusses the key factors influencing coating performance, including composition, microstructure, preparation processes, and external environments (such as corrosive media, temperature, and flow velocity). Various alloying elements, such as Cr, Mo, and Ni, have a significant impact on the erosion and cavitation resistance of Fe-based amorphous coatings. The addition of Cr and Mo can form stable passive films, enhancing the coatings' corrosion resistance. Moreover, the microstructure of the coating, such as the content of amorphous phase and grain size, directly affects its mechanical properties and erosion resistance. The cavitation resistance of the coatings is influenced by material hardness, toughness, and surface smoothness. High hardness materials can effectively resist the impact of cavitation bubbles, while better toughness helps mitigate crack propagation caused by cavitation. The potential mechanisms for the erosion and cavitation resistance of Fe-based amorphous coatings are analyzed, suggesting that their exceptional corrosion resistance primarily arises from their unique amorphous structure, which avoids defects such as grain boundaries. Finally, the review outlines future research directions for enhancing the erosion and cavitation resistance of Fe-based amorphous coatings.