A programme was conducted to evaluate the relative corrosion resistance of CoNiCrAlY and chromium modified aluminide on IN738-LC, used for turbine blades. The corrosion experiments were performed in a laboratory tube furnace. The microstructure of the coatings was characterised usingoptical electron microscopy and SEM techniques. The results indicated that at a temperature of 800°C CoNiCrAlY is more protective than a Cr–Al coating.
