Study of Ceramic and Hybrid Coatings Produced by the Sol-Gel Method for Corrosion Protection

Silica based ceramic oxides and hybrid coatings were developed using 3-(trimethoxysilyl) propylmethacrylate (TMSPM), methylmethacrylate (MMA) as the organic phase with different fractions of tetraethoxysilane (TEOS) and aluminium isopropoxide as the inorganic phase using sol-gel process which were deposited onto 316 stainless steel substrate by dip-coating technique, followed by a sintering step. Characterization of the obtained coatings was carried out by scanning electron microscopy to determine the topographical features of the coatings. Furthermore, the coatings were analyzed in this manner after the corrosion tests. Analyses of corrosion resistance for coated and uncoated samples were performed in SO 4 and Cl  solutions. The influence of the sol characteristic and composition, as well as the behaviour of the coatings during the corrosion tests were reported. The results show that coatings prevent corrosion in an acid environment, and the ceramic coating developed best resistance corrosion under those media.