Thick Aluminosilicate Coatings on Carbon Steel via Sol--Gel

Sol--gel aluminosilicate coatings were deposited on a low carbon steel substrate. Three application methods were compared: wet deposition techniques as dipping and spraying of the sol and xerogel thermal spraying with flame torch. Characterization by X-ray diffraction and scanning electron microscopy shows that amorphous thick coatings ( > 5 mu m) were obtained. Coatings present an acceptable oxidation resistance in air atmosphere at 600 deg C.