Abstract
Fe-based metallic glass/Al2O3-13 wt%TiO2 (AT13) composite coatings with sandwich-like (Fe–S20) and dispersed (Fe-D20) structures were prepared via atmosphere plasma spraying (APS). The differences in microstructure, mechanical properties, and corrosion mechanisms of composite coatings were investigated. The interfacial bonding between Fe-based metallic glasses and AT13 was analyzed by transmission electron microscope (TEM). The addition of AT13 in Fe-D20 could cause greater stress concentration in the coating. In turn, the layered stress distribution was observed in Fe–S20 coating due to the unique sandwich structure. Moreover, the introduction of AT13 improved the short-term corrosion resistance of matrix metallic glass. However, after long-term immersion, pitting corrosion occurred preferentially at the junction of AT13 and metallic glass substrate, leading to a significant decrease in the corrosion resistance of Fe-D20. Besides, the presence of AT13 hindered the growth of the passive film of Fe-based metallic glass. In summary, the long-term corrosion resistance of Fe–S20 with a sandwich structure was better than that of Fe-D20 with a dispersed structure. Thus, structure tuning has great prospects for plasma spraying ceramic composite coatings in the future.
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