在涂装工业中，传统的金属表面预处理技术（如磷化与铬酸盐钝化）对环境不友好，已不能顺应现代社会"可持续发展"的要求，而近年来开发的有机硅烷化处理工艺存在与后续涂层较高的选择性问题，阻碍其大规模的工业化应用，促使我们将探寻更理想的金属表面预处理层的目光重新回到无机氧化物材料上。先前的工作表明，借助电化学辅助沉积技术，可在导电基体表面沉积得到"牢固"、纳米多孔的粗糙SiO2 sol-gel薄膜。利用上述特性，本项目第一次提出采用电沉积SiO2薄膜作为金属材料的预处理层，在此基础上构建新一代绿色涂装防护体系，预研结果显示具有优异的长效防护性能。项目将通过研究工艺与性能，优化、构建得到高效涂装防护体系，进而探明SiO2薄膜在整个防护体系中的内在作用机制，以及防护体系的失效机制。通过上述研究，为"金属/电沉积SiO2薄膜/有机涂层"涂装体系提供理论与应用基础，期望最终实现对传统涂装防护体系的更新换代。

Traditional surface pretreatment processes, e.g. phosphating and chromatizing, in painting industry, can no longer meet the requirement of the sustainable development of the modern society, due to their environmentally unfriendly properties. Meanwhile, the recently developed silanization process has a problem of high selectivity with the topcoat, which impedes its wide industrial application. Previous work showed that, with the aid of electrochemically assisted technique, robust and nano-porous rough silica sol-gel films can be deposited onto conducting substrates. Using such advantage, this project proposes for the first time the use of electrodeposited silica films as the pre-treated layers for a new generation of protective painting system. Very recently, our preliminary investigation shows that the newly constructed painting system exhibits promising long-term protection properties. Accordingly, this project will investigate firstly the influence of some basic parameters on corrosion performance of the total painting system, after which a highly efficient protective painting system will be constructed. Further, get into the mechanistic study in the role of electrodeposited silica films played in the total paiting system, in particular focus on the theoretical study on "metal/silica film" and "silica film/protective coating" interfaces. Finally, the failure mechanism of the painting system will be also studied. The above-mentioned investigation will provide this novel paiting system the theoretical and practical guidances, and ultimately make it possible for its replacement of traditional painting system.