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We compare the wetting, morphology and anticorrosion properties of fluorosilane-modified TiO2 (FAS-TiO2/epoxy) and as-received TiO2/epoxy coatings. An array of double-layer TiO2 nanoparticles of two sizes (30 nm and 300 nm) were spin coated onto a steel substrate AISI 316L. The static water contact angles were measured to evaluate the wetting properties of the FAS-TiO2/epoxy (hydrophobic) and the as-received TiO2/epoxy (hydrophilic) coatings. The morphology of the coatings was analyzed with average surface roughness (Sa) measurements and SEM imaging. We show that the order of the deposition in a double layer composed of dual-size nanoparticles plays an important role in the surface roughness and hence the wettability. SEM images reveal a typical morphology and Sa difference between the FAS-TiO2/epoxy and the as-received TiO2/epoxy coatings, reflected in the discrepancy of the average size of the agglomerates that are coating the substrate. Potentiodynamic measurements show an enhanced corrosion resistance for the FAS-TiO2/epoxy-coated AISI 316L stainless steel compared to the as-received TiO2/epoxy-coated AISI 316L.

Surface and anticorrosion properties of hydrophobic and hydrophilic TiO2 coatings on a stainless-steel substrate