The Structure, Phase Composition and Mechanical Properties of Microplasma Electrolytic Coatings Produced on a Ti-6Al-4V Alloy

Abstract

The structure and phase composition of microplasma coatings formed on a Ti-6Al-4V alloy using the alternating current mode in solutions with different concentrations of KOH, NaAlO₂ and Na₆P₆O₁₈ were investigated using XRD analysis, microscope analysis and microhardness testing. The thickness and weight gain were measured with electronic thickness gage and correspondingly, with the gravimetric method. The crystal structure of the microplasma electrolytic coatings had amorphous, rutile, α-Al₂O₃ and Al₂TiO₅ phase. The coating morphology may be presented as 3 layers—the external amorphous layer, the internal layer, and the barrier layer.