Sol-gel derived TiO2 coating for chemical protection of stainless steel

초록

Sol-gel coatings of TiO2 have been prepared from TiO2 sol and deposited by a dip-coating technique on 316L stainless steel sheets to study their electrochemical behavior in corrosive solutions. The influence of the coatings on the chemical corrosion of the substrate was evaluated by potentiodynamic polarization curves in different aqueous NaCl solution at 25 degrees C. Comparative tests were performed on uncoated one. The thickness of the TiO2 coatings varied from 0.5-0.8 mu m. The values of the electrochemical parameters allow for an explanation of the role of the TiO2 films in the increased resistance of stainless steel against corrosion in moderately aggressive environments.

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