Investigation of Corrosion Behavior and Surface Characteristics of CoCr Alloy using Plasma-Sprayed HA/CNTs Reinforced Coatings for Biomedical Implants

Cobalt alloys are being continuously researched for their potential biological uses to improve their corrosion resistance and surface properties. In this study, the corrosion performance of cobalt alloy coated with HA and HA/CNTs reinforced powders were investigated using plasma spray technology. The results showed that the corrosion resistance gradually increased with continuous CNTs reinforcement. The increment in surface hardness and drop in surface roughness was examined with the rise in CNTs content. Each coated sample exhibits a hydrophilic property. Homogeneous distribution of HA/CNT coatings and intact CNTs reinforcement in pure HA powder were observed, based on SEM and EDX examinations. The morphological integrity of every coated specimen is preserved, providing superior protection for the prepared samples. The results indicate that HA/CNT reinforced coatings on CoCr alloy offer an outstanding combination for corrosion resistance and improved surface properties, making them a promising option for use in bone implant practices in the future.