The Effect of Processing Time on Microstructure of Surface and Corrosion Resistance of Coatings Resulted by Plasma Electrolytic Oxidation on Titanium Alloy in Hydroxyapatite Nano-particles Electrolyte

Abstract

This study investigated the e ect of coating processing time on the microstructure of surface and corrosion resistance of coatings resulting from Plasma Electrolytic Oxidation (PEO) on the substrate of TiAl6V4 alloy. The coating processes in hydroxyapatite nano-powder electrolytic were carried out under the condition of constant voltage of 600 V and three di erent times of 125, 250, and 350 seconds. Studying the microstructure of coatings identi ed that the coating formed in 125 (s) had a more compact and steady structure with ne surface cavities and less porosity. The X-ray di raction pattern of coating demonstrates that this coating consists of oxide phases of titanium (rutile and anatase) and hydroxyapatite. Moreover, the study of corrosion resistance of coatings by potentiodynamic polarization and electrochemical impedance spectroscopy in corrosive solution of chloride sodium 3.5% showed that the coating formed in 125 s had the most signi cant corrosion resistance potential and the least I Corr and, thus, the highest resistance to corrosion.

One-step plasma electrolytic oxidation for TiO 2 /SnO 2 film as LIB anode

“…Plasma electrolytic oxidation (PEO, also called micro-arc oxidation) technology is widely used to prepare oxide ceramic films on Al, Mg, Ti, Zr, and their alloys to enhance the wear resistance, corrosion resistance, biocompatibility, and photocatalytic performance [14][15][16][17][18]. It is a plasma electrolysis process under atmospheric pressure in the ambient aqueous solution, where plasma is sustained by a continuous discharge near the electrode after the dielectric layer is broken down under critical voltage [19,20].…”