Structures and Properties of Plasma Electrolytic Oxidation Coatings on Titanium and Titanium Alloys

Abstract

The structures and properties of plasma electrolytic oxidation（PEO）coatings in alkaline electrolyte on titanium and titanium alloy Ti6Al4V were investigated. A dark gray anodic coating with 1-3 μm thickness, the same as that described in the AMS 2488 standard, was obtained using PEO followed by mechanical post-treatment. It has been shown that the anodic coating exhibits excellent adhesion, a low friction coefficient, and enhanced wear resistance. After PEO and post-treatment, no substrate strength decrease or measurable change in dimensions was observed.