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Cavitation erosion behavior of cast iron in water and mixed 50%H2O+ 50%C2H6O2 with different temperatures and distances between two samples have been studied by means of a ultrasonic vibrator operating at a peak-to-peak amplitude of 40 μm.The weight loss of the samples at different time is recorded.The structure of the oxidation films on the surface of cast iron were analyzed by X-ray diffraction apparatus (XRD).The experimental results show that the maximum of weight loss occurred when the distance between the samples is about 1.0 mm.Oxidation films form on the surface of the cast iron.The oxidation film mainly consists of Fe2O3 phase at the temperature of 50 ℃,Fe3O4 phase at the temperature of 80 ℃.The weight loss at the temperature of 50 ℃ is less thanthat at the temperature of 80 ℃.Oxidation film cannot form on the surface of cast iron in the C2H6O2 or in mixed solution compared with that in pure water.Temperature has little influence on the cavitation process from 50 ℃ to 80 ℃.At lower temperature of 50 ℃,oxidation film can form on the surface of cast iron in pure water compared with that in the C2H6O2 or in mixed solution.