Enhanced electromagnetic properties and corrosion resistance of flaky FeSiCr alloy powder by thermal oxidation surface modification
摘要
FeSiCr alloy powder is widely employed as a magnetic microwave absorption material owing to its high saturation magnetization. In this work, the morphology of spherical FeSiCr powder was reconstructed by mechanical ball milling, and the oxide layer was constructed by means of controlled H2/Ar atmosphere selective oxidation heat treatment technology. The regulation of heat treatment temperature on the evolution of material morphology, electromagnetic properties and corrosion kinetics was discussed. The deposition of surface oxides regulates the balance between electromagnetic parameters, with the impedance matching being optimized, and the microwave absorption performance being significantly improved. When the heat treatment temperature reaches 900 °C, the minimum reflection loss value of the sample is − 53.2 dB. Simultaneously, the formation of a protective oxide layer effectively blocks corrosive medium penetration, suppressing electrochemical corrosion propagation and significantly enhancing the corrosion resistance of flaky FeSiCr, thereby achieving synergistic improvement in long-term service stability. This work demonstrates a viable strategy for developing advanced electromagnetic protection materials that simultaneously exhibit superior microwave absorption capabilities and enhanced environmental durability.