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Abstract

Titanium oxide (TiO2) coatings were deposited on the surface of 316L stainless steel substrates by sol-gel methods. Gel titania was prepared by hydrolysis of a titanium butoxide through a sol–gel process. Uniform TiO2 coatings have been prepared on stainless steels using a dipping technique and thermal post-treatments at 300, 500 and 700oC. The temperature dependence of the coatings morphology and structure were analyzed using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The corrosion behavior of 316L stainless steel substrates coated with densified TiO2 coatings was studied in 3.5% NaCl by potentiodynamic polarization curves at room temperature. The result shows that as the thermal post-temperature increased, the corrosion rate increased and the corrosion current density decreased gradually. The effect of withdrawing speed of the coatings on the corrosion parameters is also reported.