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The purpose of this study was to use x-ray diffraction (XRD) to obtain new information about the oxide layers on four representative oxidized high-palladium alloys.

Cast specimens of two PdCuGa alloys and two PdGa alloys, with both polished and etched surfaces and air-abraded surfaces, were subjected to oxidation procedures recommended by the manufacturers. The specimens were analyzed by x-ray diffraction using CuKα radiation, and the peaks were compared to appropriate Joint Committee on Powder Diffraction Standards (JCPDS).

The surface preparation procedure had a profound effect on the phases present in the oxide layers. For the specimens that had been polished and etched, CuGa₂O₄ and β-Ga₂O₃ were detected on the 79Pd-10Cu-9Ga-2Au alloy, whereas SnO₂ and CuGa₂O₄ were detected on the 79Pd-10Cu-5.5Ga-6Sn-2Au alloy. The oxide layers on both …