The synergistic enhancement of microwave absorption performance and corrosion resistance of FeCo by polypyrrole-M16 and TiO2

Abstract

Magnetic microwave absorbing (MA) materials applied under acidic conditions are prone to corrosion, leading to a gradual decrease in their MA performance. For this reason, it is meaningful to project an absorbing material with outstanding corrosion resistance . In this work, a core–shell anti-corrosion absorbing composite material, FeCo@TiO 2 @PPy-M16, was prepared by synergistic combination of FeCo alloy as the core material, conductive polymer PPy , semiconductor TiO 2 , and corrosion inhibitor M16. The results show that the composite material effectuates an effective absorption bandwidth (EAB) of 10.21 GHz at a thickness of 2.63 mm, demonstrating excellent MA performance. TiO 2 and PPy also significantly improved corrosion resistance of FeCo, after soaking the composite coating in 3.5 wt% NaCl solution for 40 days, its low-frequency impedance modulus is 4.6 × 10 7 Ω cm 2 , the corrosion current density is 1.12 × 10 −8 A cm −2 , and the protection efficiency is 98.1 %, showing excellent corrosion resistance . It also indicates that M16 enhances corrosion resistance without affecting the MA performance. This work brings advanced inspiration for the research of excellent MA and anti-corrosion materials in practical applications.