Effect of graphene oxide additive on tribocorrosion behavior of MAO coatings prepared on Ti6Al4V alloy

Titanium and its alloys possess the superiority on corrosion resistance and the shortage on wear resistance. Tribocorrosion, a new study orientation concerning both corrosion and wear resistances and fascinating researchers in recent years, has to be considered on the titanium, its alloys and their surface treated materials. In this study, graphene oxide (GO) particles inserted coatings were prepared by micro-arc oxidation (MAO) treatment with various GO concentrations. The composition, morphology and topography were measured to analyze the structure and properties of coatings. Electrochemical impedance spectroscopy (EIS) and polarization measurements were utilized to assess the corrosion resistance of samples. Tribocorrosion behavior was evaluated by the open circuit potential (OCP) and coefficient of friction (COF) evolutions in advance to, during and after reciprocating sliding. The results showed that in GO concentration of 5 mL/L and 10 mL/L, the GO particles were inserted into the MAO coatings and the MAO coating by adding 10 mL/L GO particles possessed best tribocorrosion resistance.