面向海洋应用的多功能涂层:基于氟硅烷包覆CIP实现防腐、吸波与减阻一体化OA

Carbonyl iron powder(CIP)is a typical magnetic loss-type microwave absorbing material.However,its susceptibility to electrochemical corrosion in harsh marine environments(characterized by high humidity and salinity)leads to performance degradation,limiting long-term applications.In this study,core-shell particles(CIP@PFOTES)were fabricated via a sol-gel method,encapsulating CIP with a perfluorodecyltrimethoxysilane(PFOTES)shell.These particles were then incorporated into a fluorosilicone resin(FSR-ZY220L)to produce a multifunctional CIP@PFOTES-ZY coating.The coating exhibited superhydrophobicity with a water contact angle of 158°.A drag reduction exceeding 70%was achieved at shear rates ranging from 0.1 to 100 s-1.The coating demonstrated excellent long-term corrosion resistance in a neutral salt spray environment.Electrochemical impedance spectroscopy(EIS)indicated that after 40 d of immersion in a 3.5 wt.%NaCl solution,the low-frequency impedance modulus(|Z|0.01 Hz)remained above 107 Ω cm2.Furthermore,with a thickness of 1.3 mm,the coating achieved an effective absorption bandwidth(EAB,RL≤-10 dB)of 7.52 GHz,demonstrating significantly superior microwave absorption performance compared to the unmodified counterpart.This study provides an effective material design strategy for developing high-performance,multifunctional protective coatings for marine applications.