Comparison of Surface Coatings by Plasma Spray Technique and Biomimetic Deposition on Ti Alloy Substrate: Morphology, Composition, and Corrosion Resistance Property

Abstract

In this study, hydroxyapatite (HAP) coatings were deposited on Ti alloy substrate by biomimetic method deposition and plasma spray technique to attain different coating morphologies. The deposition of HAP using both the techniques, i.e. plasma spray technique and biomimetic deposition lead to possible improvements in corrosion resistance property, surface roughness and micro-hardness. The surface morphologies of the coatings were studied through scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) techniques. The corrosion resistance of plasma sprayed and biomimetic coating was compared with the help of electrochemical corrosion testing with respect to uncoated samples. From electrochemical corrosion testing, it was confirmed that as-sprayed plasma spray coatings are more corrosion resistant in comparison to biomimetic coated samples and hence found to be better technique as compared to biomimetic technique. Analysis of the microstructure/composition and phase formation has also been done before and after corrosion testing respectively.