分别介绍了金属表面二氧化钛光触媒涂层的自清洁原理和光半导体光触媒的防腐蚀原理.比较了含与不含光触媒涂层的不锈钢基体在不同pH的氯化钠溶液中的腐蚀电位.指出使水接触角趋于零而产生超亲水性是光触媒涂层具有自清洁功能的原因;吸收紫外光释放电子给金属,从而降低金属的腐蚀电位,是其具有防腐性能的实质;在基体与光触媒涂层间设置中间层可以避免基体被光触媒氧化;采用WO3与TiO2复合可以使光触媒涂层在无光或夜间继续发挥其防腐蚀功能.
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