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Microstructure and oxidation performance of undoped and rhodium-doped aluminide coatings on Mar-M247 superalloy

Zagula-Yavorska Maryana

Archives of Civil and Mechanical Engineering

2019

Vol. 19, no. 3

832--841

A rhodium modification of aluminide coating on Mar-M247 superalloy was performed by electrodepositing of 0.5 mm thick rhodium layer followed by chemical vapour aluminizing. It was found that rhodium dissolves in the aluminide coating. Oxidation resistance of undoped coating is worse than the rhodium-doped one (higher weight gain). The constant kp value confirms the favourable modification effect of rhodium on resistance against oxidation of aluminide coatings. Rhodium reduces the oxide growth rate three times. Moreover, it dissolves in the NiAl rather than in the g0-Ni3Al during oxidation. The degradation rate from NiAl to g0-Ni3Al and Al2O3 layer growth has decreased.