首页|Enhancement of oxidation and corrosion resistance of flaky carbonyl‑iron powder via SiO2/KH560/PDMS coating applied with sol-gel

Enhancement of oxidation and corrosion resistance of flaky carbonyl‑iron powder via SiO2/KH560/PDMS coating applied with sol-gel

扫码查看
原文链接
  • NSTL
© 2022 Elsevier B.V.The popular magnetic material of flaky carbonyl iron (FCI) is unfortunately vulnerable to electrochemical corrosion when exposed to a salty and foggy environment. This work reports on a sol-gel method that successfully modifies FCI particles, using lithium silicate (Li2SiO3), poly dimethyl siloxane (PDMS), and γ-(2,3-epoxypropoxy) propytrimethoxysilane (KH560), to synthesize Fe@SiO2@KH560@PDMS hybrid composite, related to its organic–inorganic hybrid coatings. The favorable hydrophobicity of organic–inorganic hybrid coatings with the static contact angle of 120° impeded the contact between corrosive medium and FCI core. The results of electrochemical experiments also confirmed its excellent corrosion resistance, since the corrosion potential Ecorr was positively shifted to 0.01 V, and the corrosion current Icorr was three orders of magnitude lower than that of the unmodified FCI particles. Thermogravimetric (TG) analysis indicates that the presence of hybrid coatings also improved the thermal stability of the produced material towards oxidation. Furthermore, the results of molecular dynamics simulation reveal that the hybrid layer inhibits the diffusion of corrosive medium.

Coating layerCorrosion resistanceFlaky carbonyl ironMolecular dynamicsOxidation resistance

Wang B.、Xie J.、Lu H.、Deng L.、Yin L.、Agathopoulos S.、Zhang L.、Wan W.、Jiang X.

展开 >

National Engineering Research Center of Electromagnetic Radiation Control Materials Key Laboratory of Multi-Spectral Absorbing Materials and Structures of Ministry of Education State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of China

The Yangtze Delta Region Institute (Huzhou) University of Electronic Science and Technology of China

Materials Science and Engineering Department University of Ioannina

2022

10.1016/j.surfcoat.2022.128346

Surface & Coatings Technology

Surface & Coatings Technology

ISTP
ISSN：0257-8972
年,卷(期)：2022.437
  • 50