Comparative Study of Enhancement of Corrosion Resistance of Stainless Steel Alloy by Plasma Spray Technique and Biomimetic Deposition

Abstract

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