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The corrosion behaviors in 3.5%NaCl solution at 37℃ of a basic type of RE containing magnesium alloy Mg-15Y alloy prepared at different heat treatment were studied.The amount of Mg24Y5 phase decreased with extending of homogenization treatment.The time of achieving dissolving equilibrium of homogenization treatment at 525 ℃,535 ℃ and 545 ℃ were 24 h,20 h and 8 h.