Corrosion Behavior and Mechanical Properties of FHAP/ MAO Composite Coating on Pure Titanium Substrate Prepared by Micro-arc Oxidation and Electrochemical Deposition

A fluorine-doped hydroxyapatite (FHAP)/micro-arc oxidation (MAO) composite coating was deposited on commercially pure titanium (CPTi) surface through micro-arc oxidation and electrochemical deposition (ED) technique. Simulative Hank's solution was used to test the electrochemical corrosion resistance of uncoated CPTi substrate and coated samples. The effect of MAO interface layer on the micro-structure, mechanical property, and electrochemical property of the coating was studied. Results show that the deposited HAP/Ti, FHAP/Ti and FHAP/MAO/Ti coating samples dramatically improve the anticorrosion of the CPTi substrate in the simulative Hank's solution. However, the mechanical properties testing shows that FHAP/Ti coating has a poor bonding strength of 10.7 MPa compared to FHAP/Ti coating with a MAO interface layer (18.1 MPa). Furthermore, the contact angle of the FHAP/MAO/Ti coating with deionized water is approximately 35.8°, which is more beneficial to promoting cell attachment and proliferation. Copyright © 2019, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.