Comparison of hot corrosion behavior of Ti6Al4V and TiAlN-coated Ti6Al4V alloys in Na2SO4-V2O5 environment

Abstract

Damage mechanisms such as oxidation and hot corrosion, which shorten life of the materials and system efficiency, occur in systems operating at high temperatures in the aviation, aerospace, automotive, and defense industries. In this study, Ti6Al4V and TiAlN-coated Ti6Al4V alloys, which have high specific strength and corrosion resistance, were subjected to isothermal hot corrosion tests at 900 degrees C in the presence of 45% Na2SO4 and 55% V2O5 hot corrosion salts for 1, 3, 5, and 10 h under open-to-atmosphere conditions. The changing phase, microstructure, and elemental distribution of the alloys were determined using advanced characterization techniques such as SEM, EDS, and XRD. Systems with a TiAlN coating layer were found to be more durable in short-and medium-term corrosive environments compared to the Ti6Al4V alloy.