Modifications of Hydroxyapatite by Gallium Ion as a Coating on Dental Ti6Al4V for Corrosion Protection

Gallium ion (Ga) was substituted for bioactive ions in the hydroxyapatite "HA" coating formed on the "Ti-6Al-4V ELI" dental alloy (Gr.23) utilizing electrochemical deposition in this study. Scanning electron microscopy was used to examine the deposited layers (SEM). Electrochemical methods potentiodynamic polarization curves were used to study and characterize the corrosion behavior of Gr.23 alloy in an artificial saliva environment at temperatures ranging from 298 to 328K. After modification coating of HA with Ga at 298K, corrosion protection increased from (50.49) percent (coated Gr.23 by HA without Ga) to (76.0) percent. The coating thickness was estimated using a cross-sectional SEM micrograph; the thickness of the coatings for HA and Ga-HA coatings were (3.51 and 3.62 m, respectively).