Steel Substrates Comprising A Rare Earth Doped Silica Alumina Nanocoating, Coating Compositions, And Methods Thereof

Abstract: ABSTRACT “Steel substrates comprising a rare-earth doped silica-alumina nanocoating, coating compositions, and methods thereof” The present disclosure provides a steel substrate comprising a rare-earth doped silica-alumina coating comprising: a) about 0.5-6.5 wt% of Al; b) about 0.5-6.5 wt% of Si; and c) about 0.1-11 wt% of a rare earth element. The rare-earth doped silica-alumina coating is a nanocoating and provides a very high corrosion resistance to steel substrates and at the same time renders the steel substrates formable, weldable, paintable, and fuel resistant. The present disclosure also provides a coating composition for depositing the rare-earth doped silica-alumina coating on steel substrates, wherein the coating composition comprises a) an aqueous solution of an acid; b) a silane; c) aluminium iso-propoxide; d) a compound of a rare earth element; and e) orthophosphoric acid or a derivative thereof. The present disclosure also provides a method for preparing the coating composition and a method for preparing the steel substrate comprising the rare-earth doped silica-alumina coating. Figure 1

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