Comparative Corrosion Behaviour of Cold Sprayed Titanium/Hydroxyapatite and Titanium/Baghdadite Composite Coatings in Simulated Body Fluid Environment

Bioceramics deposition on medical devices is a widespread area of research for biomedical industries since such deposits can induce excellent chemical and biological properties to the devices. Thermal spraying has been a popular choice to develop coatings to enhance mechanical, chemical, and biological responses of the medical devices. However, high heat involved during thermal spraying of bioceramics limits their functionality. In this context, low processing temperature in cold spraying is believed to protect the bioceramics from degradation. However, depositing bioceramics using cold spray and achieving good mechanical properties are still challenging tasks because of their poor ductility. Therefore, bio metal-matrix composites with reinforced bioceramics produced using cold spray are expected to give good mechanical, chemical, and biological properties. The present work presents deposition and microstructural characterization of titanium/hydroxyapatite and titanium/baghdadite composite coatings by cold spraying. Furthermore, comparative corrosion response of these coatings under a simulated body fluid environment is reported. The effect of laser remelting on microstructure and corrosion behaviour is also discussed.