Tungstate- and molybdate-based ceramic coating for protection of metal surfaces, preparation procedure and use thereof

Abstract

Inorganic ceramic coatings are disclosed whose chemical compositions comprise silicates, acids, metallic oxysalts such as tungstates and molybdates, water, and non-metallic oxides such as silicon oxide. The water-based inorganic ceramic coatings improve the ceramic, anti-corrosive and resistance properties of the metal substrates that are coated with same. A sol-gel process for synthesizing said the coatings comprises a process in which the non-metallic oxide, before being mixed with the rest of the components of the chemical compositions as claimed, can be pre-treated with hydrochloric acid and ammonium hydroxide, or can be sonicated to achieve a particle size in the range from approximately 160 to approximately 180 nm. A method for coating the metal parts with the inorganic ceramic coatings is also disclosed.