Investigation of the Characteristics of MAO Coatings Formed on Ti6Al4V Titanium Alloy in Electrolytes with Graphene Oxide Additives

Coatings with a thickness from ~40 to ~50 µm on Ti6Al4V titanium alloy were formed by micro-arc oxidation in silicate-hypophosphite electrolyte additions of graphene oxide. Micro-arc treatment was carried out the anode–cathode mode (50 Hz) ratio anode cathode currents 1:1, total density 20 A/dm2, and duration 30 min. The effect oxide concentration electrolytes thickness, roughness, hardness, surface morphology, structure, composition coatings, its electrochemical corrosion behavior 3.5% NaCl solution studied. input additives into base silicate hypophosphite led an increase hardness coatings. Electrochemical polarization studies impedance data showed that best characteristics terms corrosion-protective ability among coatings those 0.1 g·L−l. A further did not improve protective properties