Characterization and Corrosion Behavior of Hydroxyapatite- Coated Titanium Substrates Prepared Through Laser Induced Liquid Deposition Technique

Titanium and titanium alloys are often used in orthopedic surgery and dentistry because of their especial characteristics such as biocompatibility, mechanical properties, and corrosion resistance. However, their bio- inertness is the most serious drawback for biomedical applications. Therefore, a bioactive coating like hydroxyapatite (HA) is coated on their surface. In this regard, in the present study, laser induced liquid deposition (LLD) technique was used to deposit nanocrystalline HA films on titanium substrates at room temperature and various exposure times (20, 30, and 60 min) were examined. The LLD method was employed via applying a laser irradiation into a liquid precursor and depositing the HA films on titanium substrates immersed in the liquid precursor. Materials characterization was examined by X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM) equipped Electron Dispersive X-ray (EDX). Also, corrosion behaviors of coating were evaluated by potentiodynamic polarization test in simulated body fluid (SBF). Results showed that by choosing the appropriate exposure time, the corrosion resistance of coated substrates improves by HA coatings versus uncoated Ti substrates.