Abstract
Considering the importance of coatings bonding to the substrate, electrophoretic deposition of bioglass coatings reinforced with hydroxyapatite whiskers was performed on anodized titanium substrate. Bioglass powders with both fine particle size (FBG) and coarse particle size (CBG) were used. It was found that Vickers microhardness and bioactivity of the coatings are not affected by titanium anodizing. The enhancement of 58% was obtained for the adhesion strength of FBG based coating due to the interlocking of titania nanotubes with fine bioglass particles entered the voids of nanotubes, which was only 32% for coarse bioglass particles. The microstructure of the coatings demonstrated no changes by anodizing the substrate, while the thickness of the coatings reduced significantly owing to the decreased deposition kinetics. The enhancement of the bactericidal effect and cellular behavior of the coatings indicated the positive impact of the underlaid nanotubes compared with bare titanium. The declined corrosion current density of the coated samples on nanotubes compared to titanium revealed the inhibitory effect of anodizing in terms of corrosion.
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