Corrosion performance of hydroxyapaite and hydroxyapaite/titania bond coating for biomedical applications

Abstract

The aim of current investigation is to access in-vitro corrosion performance of flame sprayed titania (TiO2) coated 316L stainless steel, hydroxyapatite (HAp) coated, hydroxyapatite/titania bond coated (HAp/TiO2) 316L stainless steel and plasma sprayed zirconia (ZrO2) coated 316L stainless steel. In HAp/TiO2 bond coatings, TiO2 was utilize as a bond coat between the 316L stainless steel substrate and HAp top coat. The different characterization methods such as SEM, EDS, XRD and electrochemical methods were used to analyse the electrochemical characteristics as well as microstructural morphology phases of the coatings. In addition the corrosion behavior of the coated and uncoated samples was performed in simulated body fluid. The tests were carried out for potentio-dynamic polarization and open circuit potential. The experimental results reveal that after the deposition of bond coatings (HAp, TiO2, ZrO2 and HAp/TiO2) the corrosion resistance of the steel was observed to increase.