Preparation and oxidation of an Y2O3-dispersed chromizing coating by pack cementation at 800 °C

Preparation and oxidation of an Y2O3-dispersed chromizing coating was investigated by chromizing an as-electrodeposited Ni–Y2O3 composite film using a conventional pack-cementation method but at a greatly decreased temperature (800 °C). For comparison, chromizing was also performed in the same condition on an as-deposited Ni film without Y2O3 particles. Oxidation at 900 °C indicated that compared to the Y2O3-free chromizing coating, the Y2O3-dispersed chromizing coating exhibited an increased oxidation resistance, due to the formation of purer and denser chromia scale. The Y2O3 effects on the coating formation and the coating oxidation behavior are discussed in detail.