The corrosion resistance of metals can be improved by means of the protective coatings. Recently, besides unary coatings also composite coatings have been investigated.

In this work, composite, sandwich type, Al₂O₃ - TiO₂ coatings were deposited on X2CrNi18‑9 and 21CrMoV5 steels by the sol-gel method. TiO₂ and Al₂O₃ soles were prepared using titanium(IV) butoxide and aluminium isopropoxide, respectively. The coatings were annealed at the temperature of 500 and 800^oC.

The morphology of coatings was analyzed by SEM. Their protective properties were investigated in the range of electrochemical and high-temperature corrosion. Electrochemical tests were carried out in the Ringer solution. High-temperature corrosion tests were carried out by the measurement of surrosion. The adhesion of coatings was evaluated using the scratch-test method.

It was found that composite oxide sol-gel coatings increased the resistance of investigated steels in the range of electrochemical and high-temperature corrosion and revealed the good adhesion to the steel substrates.

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1. Adhesion of composite carbon-hydroxyapatite coatings deposited on 316L stainless steel
2. Effect of carbon interlayer on the protective properties of hydroxyapatite coating deposited on 316L stainless steel by sol-gel method