Sol-gel法制备耐蚀涂层的技术及应用

Sol-gel法制备耐蚀涂层对提高基材的化学耐久性、防止氧化、控制腐蚀有显著的效果,有望完全替代传统材料表面腐蚀控制处理使用的毒性物质铬酸盐处理工艺,可以减轻对环境的污染,是一项可持续发展的表面处理技术.为了阐述该项技术的工艺方法及特点,综述了Sol-gel法制备技术在不同的金属基体--不锈钢、铝合金和铜合金表面中的应用现状和最新研究进展.分析了采用Sol-gel法制备耐蚀涂层可以有效地阻止腐蚀介质对基体金属材料的破坏,延长材料在实际应用环境中的使用寿命等方面的作用原理,从理论上对Sol-gel耐蚀涂层的形成机制和耐蚀机理进行了初步讨论,并对Sol-gel技术的应用前景作一简要展望.

Technique and application of anticorrosion coatings prepared by Sol-gel method

Anticorrosion coatings prepared by Sol-gel method could exhibit excellent chemical durability, oxidation prohibition and corrosion resistance for the substrates, so they had the potential to substitute the conversion technique of the toxic substance of chromate which was traditionally used for increasing corrosion resistance of material to lower environmental contamination. This method was an environmentally friendly technique of surface modification. To present the processes and characteristics of the method, the application and recent development of Sol-gel method applied on different metal substrates, such as stainless steel, aluminum, copper and their alloys, were introduced in detail. That applying Sol-gel method to prepare anticorrosion coatings could effectively inhibit corrosion processes of metal substrates caused by aggressive media and prolong application term of material in practical environment was therefore analyzed. The primary explanations for the formation and anticorrosion mechanism of Sol-gel coatings were theoretically given, and the long-term outlook for the application of this method was also briefly made.