Abstract A photo-initiated sol-gel process has been developed to deposit organic-inorganic hybrid (OIH) thin films on metal substrates for corrosion protection. Wet films of non-aqueous compositions containing specially designed organo-silane precursors and photo-latent catalysts –photo-acid generator (PAG) or photo-base generators (PBG)-, were exposed to ultraviolet (UV) radiation under ambient moisture environment leading to OIH films by sol-gel reactions. Synthesis and curing of organo-silanes were characterized using instrumental and gravimetrical techniques. Moreover, the corrosion resistance performance of OIH films based on two families of organo-silane precursors cured by PAG and PBG were compared with those obtained by the conventional aqueous sol-gel process. The effects of precursor and photocatalyst type, UV light intensity, cure conditions, and film thickness on anti-corrosion performance of OIH coatings were studied using various qualitative and quantitative techniques such as DC polarization, electrochemical impedance spectroscopy (EIS), and accelerated salt spray test. Results revealed that selected OIH pretreated samples showed corrosion current density as low as 1.2 nA/cm2, which is superior compared to conventional hexavalent chromium-based Cr (VI) pretreatments. The study demonstrates the feasibility of this sustainable photo-initiated sol-gel process for many applications, such as primer-less coating systems.

中文翻译：

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通过紫外线引发的工艺获得的耐腐蚀有机-无机混合预处理适用于无底漆涂料体系

摘要 已开发出一种光引发溶胶-凝胶工艺以在金属基材上沉积有机-无机杂化 (OIH) 薄膜以进行腐蚀保护。含有专门设计的有机硅烷前体和光潜催化剂 - 光酸产生剂 (PAG) 或光碱产生剂 (PBG) - 的非水性组合物的湿膜在环境潮湿环境下暴露于紫外线 (UV) 辐射下，导致通过溶胶-凝胶反应制备 OIH 薄膜。使用仪器和重量分析技术表征有机硅烷的合成和固化。此外，将基于 PAG 和 PBG 固化的两类有机硅烷前驱体的 OIH 薄膜的耐腐蚀性能与通过传统水溶胶-凝胶工艺获得的薄膜进行比较。前驱体和光催化剂类型、紫外光强度、使用各种定性和定量技术，如直流极化、电化学阻抗谱 (EIS) 和加速盐雾试验，研究了固化条件和膜厚度对 OIH 涂层防腐性能的影响。结果表明，选定的 OIH 预处理样品显示出低至 1.2 nA/cm2 的腐蚀电流密度，这优于传统的六价铬基 Cr (VI) 预处理。该研究证明了这种可持续的光引发溶胶-凝胶工艺在许多应用中的可行性，例如无底漆涂层系统。结果表明，选定的 OIH 预处理样品显示出低至 1.2 nA/cm2 的腐蚀电流密度，这优于传统的六价铬基 Cr (VI) 预处理。该研究证明了这种可持续的光引发溶胶-凝胶工艺在许多应用中的可行性，例如无底漆涂层系统。结果表明，选定的 OIH 预处理样品显示出低至 1.2 nA/cm2 的腐蚀电流密度，这优于传统的六价铬基 Cr (VI) 预处理。该研究证明了这种可持续的光引发溶胶-凝胶工艺在许多应用中的可行性，例如无底漆涂层系统。