Correlation Between Microstructure and High-Temperature Oxidation Resistance of Jet-Electrodeposited Ni-Based Alloy Coatings

In the present study, Ni-based alloy coatings were prepared on copper substrates by jet electrodeposition, and their oxidation resistance was evaluated by isothermal oxidation resistance tests at 700, 800, and 900 °C, respectively. The oxidation kinetics of the jet-electrodeposited alloy coatings follow the parabolic rate law. The oxidation resistance of Ni and NiFe coatings is superior to that of jet-electrodeposited NiW coating, while the deposited ternary NiFeW alloy coatings exhibited the highest oxidation resistance. The enhanced high-temperature oxidation resistance could be mainly attributed to the excellent thermal stability of Fe 2 O 3 and NiO phases formed in the alloy coatings during oxidation.