Influence of superficial CeO2 coating on high temperature oxidation behavior of Ti-6Al-4V

The effect of superficial CeO2 coating on the oxidation behavior of Ti-6Al-4V has been studied under isothermal and cyclic heating conditions in the temperature range of 923-1223 K in dry air. During the early periods of exposure, the oxide scale grows obeying near linear followed by near parabolic kinetics and consists of alternate layers of alpha-Al2O3 and TiO2. The mass gain of the uncoated alloys is found to be two times higher than that of the coated one in the temperature range of 923-1123 K up to 36 h of exposure. The scale composition on the bare or coated alloy is found to depend both on the temperature and on the time of exposure. During cyclic exposure, the scale suffers spallation for both the bare and the coated alloy, which has been attributed to insufficient plasticity of the scale. (C) 2012 Elsevier B. V. All rights reserved.