Abstract
The oxidation behavior of CrAl coatings with three representative compositions deposited on Zircaloy-4 in 1200 °C steam environment has been studied. The Cr0.90Al0.10 coating shows bettter performance than the other CrAl coatings due to the protectiveness of both the outer Cr2O3 oxide layer and the internal Al2O3 oxide layer. The Cr0.95Al0.05 coating shows partial-protective performance, exhibiting a continuous Cr2O3 oxide layer and Al2O3 oxide islands. However, the oxidation resistance of the Cr0.68Al0.32 coating is poor, exhibiting a discontinuous Al2O3 layer on the surface and cracks in the coating. The effect of Al concentration on the oxidation resistance of CrAl coatings is discussed in detail.
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