摘要
超疏水材料的发展在铝合金表面腐蚀防护领域表现出了巨大应用潜力.然而,超疏水表面机械稳定性不足限制了该领域的快速发展.本研究通过合成铝磷酸盐(AP)无机黏合剂,并与疏水性气相二氧化硅(HF-SiO2)纳米颗粒和聚二甲基硅氧烷(PDMS)相结合,利用操作简便的喷涂技术在铝合金基体上制备出了具有良好机械稳定性的HF-SiO2@PDMS@AP超疏水复合涂层.研究结果表明,AP无机黏合剂的引入显著增强了涂层的耐磨性,即使在经历了 2000 cm的砂纸磨损后,表面仍能保持其超疏水性能和微纳米多级结构.电化学阻抗谱(EIS)测试结果显示,与初始的铝合金基体相比,HF-SiO2@PDMS@AP超疏水涂层的电荷转移电阻(Rct)提升5个数量级,低频模值(|Z|0.01Hz)提升了 4个数量级,缓蚀效率达99.99％,表现出了优异的抗腐蚀能力.该涂层所具有的机械稳定性和耐腐蚀性能有望大幅拓展其在海洋和工业环境中的表面功能防护应用.
Abstract
The development of superhydrophobic materials has demonstrated significant potential in the realm of corrosion protection for aluminum alloy(Al alloy)surfaces.However,the limited mechanical stability of superhydrophobic surfaces has impeded the rapid advancement in this field.In this research,we synthesized an aluminum phosphate(AP)inorganic binder and combined it with hydrophobic fumed SiO2(HF-SiO2)nanoparticles and polydimethylsiloxane(PDMS)to develop a HF-SiO2@PDMS@AP superhydrophobic composite coating with improved mechanical stability on Al alloy substrates using a simple spray-coating technique.The findings indicate that the addition of the AP inorganic binder significantly enhanced the coating's resistance to abrasion,maintaining its superhydrophobic properties and micro-nano hierarchical structure even after being subjected to a sandpaper abrasion distance of 2000 cm.Electrochemical impedance spectroscopy(EIS)testing showed that the low-frequency modulus(|Z|0.01Hz)of the HF-SiO2@PDMS@AP superhydrophobic coating increased by four orders of magnitude compared to the initial Al alloy substrate,resulting in a substantial improvement in corrosion protection capacity.The impressive corrosion resistance and mechanical stability exhibited by this coating have the potential to greatly expand the practical applications of such materials for surface functional protection in marine and industrial environments.
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