Abstract
The influence of NiAl2O4 spinel formation on the oxidation behavior of the Ni50Al alloy at 1273 K in air was investigated. Pulsed electrodeposition was used to introduce a nano layer of Ni prior to the oxidation test of the Ni50Al alloy. Excluding the initial stage of oxidation, the oxidation mass gains of the coated sample significantly decreased, and the oxide scale growth rate was slower than that on the bare Ni50Al alloy sample. Peaks from the metastable Al2O3 phases were detected for the Ni-coated Ni50Al sample in X-ray powder diffraction (XRD) analysis even after 100 h oxidation. Multi-layered oxide scale of facet-NiO, fine-NiAl2O4 and dense Al2O3 has developed on the oxidized coated sample, in the order from outside to inside the oxide scale. NiO was consumed in the formation of denser NiAl2O4 spinel that hindered the oxidation kinetics of the Ni50Al alloy. The results confirmed that the slower growth rate of oxide on the coated sample might be attributed to the blocking effect of the NiAl2O4 spinel even though metastable Al2O3 phases still grow.
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