High-Temperature Oxidation of Sprayed NiAl–Re Coatings Subjected to Magnetic Treatment

Abstract

The effect of structural changes that occur in high-temperature detonation NiAl–Re coatings treated in the magnetic field on their oxidation is examined. It is shown that the surface of coatings subjected to magnetic treatment is rich in nickel and the layers of nickel oxides form more intensively and at a greater depth (as compared with those without magnetic treatment) until a continuous layer of aluminum oxide forms in the scale. The removal of the nickel-rich layer leaves aluminum-rich surface where a continuous protective layer of Al₂O₃ scale can be formed in high-temperature oxidation.