Cyclic oxidation behaviour of electrodeposited Ni3Al–CeO2 base coatings at 1050°C

Abstract This paper presents the cyclic oxidation behaviour of electrodeposited pure, nano CeO 2 (9–15 nm)- and micron CeO 2 (5 μm)-modified Ni 3 Al coatings on Fe–Ni–Cr substrate at 1050 °C for periods up to 500 h. The pure Ni 3 Al coating had a marginal resistance to cyclic oxidation at 1050 °C, while the CeO 2 -dispersed Ni 3 Al coatings showed much better cyclic oxidation resistance. This difference was attributed to many beneficial effects of CeO 2 including changing the growth mechanism of α-Al 2 O 3 scale, reducing the growth rate of the scale, improving mechanical properties of the scale, and reducing void formation at the scale/coating interface and at the scale-grain boundaries.