A silica-based organic–inorganic hybrid coating has been developed for corrosion protection of aluminum substrates by dip-coating technique. The hybrid sols were prepared by hydrolysis and condensation of trimethoxy(7-octen-1-yl)silane (TMOS) and tetraethyl orthosilicate (TEOS) in the presence of acetic acid. Structural characterization of the hybrid coatings was performed using powder X-ray diffraction analysis (PXRD). The morphology of the coating has been studied by scanning electron microscope (SEM). Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) tests have been performed, and the results showed that the silane coatings had high corrosion resistance. The heat treatment of the coatings at various temperatures have been investigated, and the results show that 130^∘C is an optimized temperature. The results expose that the hybrid coating enhanced the corrosion protection of aluminum in aqueous 3.5% NaCl solution.

中文翻译：

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用于保护铝基材的有机-无机混合涂层的合成

已经开发了一种基于二氧化硅的有机-无机杂化涂层，用于通过浸涂技术对铝基材进行腐蚀保护。杂化溶胶通过三甲氧基(7-octen-1-yl)硅烷(TMOS)和原硅酸四乙酯(TEOS)在乙酸存在下的水解和缩合制备。使用粉末 X 射线衍射分析 (PXRD) 进行混合涂层的结构表征。通过扫描电子显微镜（SEM）研究了涂层的形貌。进行了电化学阻抗谱（EIS）和动电位极化（PDP）测试，结果表明硅烷涂层具有较高的耐腐蚀性。研究了涂层在不同温度下的热处理，结果表明：130 ^∘C是优化的温度。结果表明，混合涂层增强了铝在 3.5% NaCl 水溶液中的腐蚀保护。