engleski

IMPROVEMENT OF CORROSION RESISTANCE OF THE STAINLESS STEEL BY SOL-GEL TiO2–ZrO2 FILMS

Single layer thin films of TiO2–ZrO2 were deposited on the AISI 316L austenitic stainless steel by sol-gel process and dip coating method to improve its corrosion resistance properties. For the preparation of sol titanium isopropoxide and zirconium butoxide were used as precursors, i- propanol as a solvent with addition of nitric acid as a catalyst, acetylacetone as a chelating agent and water for hydrolysis. Deposited films were calcined at the temperature of 400 °C and 600 °C. Thickness of sol-gel TiO2– ZrO2 films deposited on stainless steel was determined by glow-discharge optical emission spectrometry (GD-OES). The morphology of the film was analysed by SEM-EDS. The corrosion behavior of stainless steel, coated by amorphous films, was evaluated in 3.5 wt.% NaCl by potentiodynamic polarization and electrochemical impedance spectroscopy techniques. It was found that the sol-gel TiO2–ZrO2 films with amorphous structure and deposited by the sol–gel process enhance the corrosion properties of AISI 316L in chloride media.

sol-gel film; corrosion; stainless steel

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