Zirconia sol-gel coatings deposited on 304 and 316L stainless steel for chemical protection in acid media

摘要

Corrosion resistance is one property that many industries require for materials that are used in their equipment and components. Some researches have reported on corrosion behaviour in aqueous acid or basic solutions of steels, metals and alloys protected by sol-gel coatings [1-4]. Sol-gel films of zirconia, silica and mixed oxides of SiO2-TiO2 and SiO2-Al2O3 prepared by dip-coating using sonocatalysed sols have been shown as promising coatings to prevent against corrosion of stainless steel [5-10]. All these inorganic films improve the chemical and physical properties and increase the protection of metal substrates from air corrosion, basic and acid attack.