Abstract: In order to improve the corrosion resistance of 20 steel plate，based on the principle of photosensitive micromachining，a hydrophobic TiO₂-SiO₂ dot matrix coating filmwas prepared on the surface of 20 steel plate by the sol-gel method. The photosensitive mechanism of TiO₂-SiO₂ composite sol was emphatically studied，and the corrosion resistance of 20 steel plates protected by TiO₂ dot matrix coating，TiO₂-SiO₂ dot matrix coating and flat bottom layer/TiO₂-SiO₂ dot matrix coating was compared. The results showed that the TiO₂-SiO₂ sol indicated excellent photosensitivity to the ultraviolet light with the photosensitivewavelength of 330-380 nm，and the solubility of sensitized Ti4+metal chelates in organic solvents decreased sharply. Based on this principle，using the photosensitive sol-gel technology could obtain the TiO₂-SiO₂ lattice gel pattern with complete structure. The latticepattern made the material change from hydrophilicity to hydrophobicity，and the corrosion resistance was greatly improved，Among them，the flat bottom layer/TiO₂-SiO₂ lattice coatingfilm showed no corrosion marks on the surface after salt spray test，and this coating indicated strong protective ability for 20 steel plates.

Key words: photosensitive sol-gel；20 steel；TiO₂-SiO₂ lattice；corrosion resistance

摘要： 为提升 20钢的耐腐蚀性，基于感光微细加工原理，采用溶胶凝胶法在 20钢表面制备了具有疏水性的 TiO₂-SiO₂点阵涂层，重点研究了 TiO₂-SiO₂复合溶胶的感光机理，并对比了受 TiO₂点阵涂层、 TiO₂-SiO₂点阵涂层和平铺底层 /TiO₂-SiO₂点阵涂层保护的 20钢的耐腐蚀性。结果表明： TiO₂-SiO₂溶胶对 330~380 nm紫外光具有优秀的感光能力，感光后的 Ti⁴⁺金属鳌合物在有机溶剂中的溶解度急剧降低，因此，采用感光溶胶凝胶技术可以获得结构完整的 TiO₂-SiO₂点阵涂层，使材料由亲水性向疏水性转变，并且耐腐蚀性大幅度提升，其中平铺底层 /TiO₂-SiO₂点阵涂层经盐雾试验后表面没有任何腐蚀痕迹，对 20钢板有很强的保护能力。

关键词: 感光溶胶凝胶； 20钢； TiO2-SiO2点阵涂层；耐腐蚀性

CLC Number: 

• TQ635. 2