Investigation of corrosion and surface morphological behaviour of hydroxyapatite coated surgical stainless-steel using electrodeposition process

Abstract

Metallic materials have been widely used in the field of biomedical industry such as dental and orthopedic implants owing to high tensile strength, fatigue strength, and fracture toughness. Many materials are used as biomaterial includes Ti alloys, Co alloys, Mg alloys, and 316L SS. To reduce the cost of surgery, SS 316L is the most widely used biomaterial because of its low cost, excellent mechanical properties, superior corrosion resistance, and chemically stable in the environment. The main disadvantage of the material is to release toxic ions in the body fluid environment like chromium, nickel, and iron. To overcome the problem, hydroxyapatite coating over the metallic implant provides better bioactivity, osteocompatibility, and antibacterial activity. This layer is used to prevent further passing of ions from the biomaterial and enhances the tissue growth on the bone. The present work is to focus on the synthesis of HAp from cuttlebone using a simple wet precipitation method. The surface of the SS 316L was coated with prepared HAp by electrodeposition method. The coated SS 316L was characterized by various techniques such as Fourier transform infrared spectroscopy (Functional group analysis), X-ray diffraction spectroscopy (crytalline size of the particle), scanning electron microscopy (surface morphology), and energy dispersive X-ray analysis (elemental composition). The electrochemical characterization technique was carried out for coated and pristine samples in SBF solution at the temperature of 370C using the cyclic voltammetric method. The anti-corrosion property of coated sample was increased when compared to the pristine sample. The antimicrobial activity of the coated and pristine sample was evaluated against the pathogenic bacterial strains Bacillus cereus and Escherichia coli. Finally, it is concluded that HAp coated SS 316L could be considered as a better candidate for biomedical application because of the improving the property SS 316L.