The oxidation performance for Zr-doped nickel aluminide coating by composite electrodepositing and pack cementation

Ni-Zr composite coatings were prepared by composite electrodepositing with the Zr particle loadings from 0.1 g/L Zr to 0.7 g/L Zr. Then the Ni-Zr coatings were aluminized by the pack cementation and heat-treatment to obtain Zr-doped β-NiAl coatings. The effects of Zr on the coating microstructure and oxidation performance were investigated. The spallation resistance for Zr-doped NiAl coatings was better than the coating without Zr. The coating of 0.5 g/L Zr loading exhibited the best spallation resistance duo to a lower growth rate of the oxide scale and the formation of a mechanically interlocking oxide pegs structure.