Self-lubricating superhydrophobic SMPT@MoS2-SiO2 coatings with enhanced corrosion resistance and lubrication performance
Yuanyuan Hou , Zunshuo Li , Yuankang Zhang , Junwei Cao , Meixue He , Yongling Wu , Yonghua Wang , Mingming Liu
Journal of Central South University ›› : 1 -18.
201 stainless steel is widely used in daily applications owing to its favorable strength and corrosion resistance. However, its relatively high manganese content introduces significant internal stress, making it susceptible to microstructural defects. In aggressive environments—such as acidic or alkaline media—these defects serve as pathways for corrosive species to penetrate the substrate, leading to structural degradation and eventual failure of the alloy. In this study, a superhydrophobic coating was applied onto the surface of 201 stainless steel to act as a protective barrier, effectively inhibiting the penetration of corrosive media. The resulting coating exhibited excellent anticorrosion performance, with an electrochemical impedance modulus reaching 6.94×108 Ω·cm2. Additionally, the surface demonstrated a high water contact angle of 155°, a pencil hardness of 7H, and a robust adhesion strength rated at 5B. The inorganic sol – gel solution (SMP) was prepared by hydrolyzing a mixture of colloidal silica and methyltriethoxysilane in a solvent system comprising deionized water and n-propanol. Meanwhile, the hybrid organic – inorganic hydrophobic solution (TTPD) was synthesized via acid-catalyzed hydrolysis and condensation of titanium isopropoxide with hydroxyl-terminated polydimethylsiloxane (PDMS). Subsequently, the SMP and TTPD solutions were mixed at an optimized ratio, followed by the incorporation of MoS2 – SiO2 hybrid nanoparticles via mechanical stirring. This process yielded a uniform and stable SMPT@MoS2 – SiO2 composite coating with enhanced hydrophobic and protective properties.
superhydrophobic coating / SMPT binder / MoS2 / corrosion resistance / wear resistance
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Central South University
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