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采用金相显微镜、X射线衍射仪、扫描电镜和失重法等方法探讨了稀土元素Ce加入后对镁合金显微组织和耐腐蚀性的影响。结果表明,随Ce含量的增加,镁合金铸态组织中α相变细,β相逐渐由网状转变成块状。经T4热处理后稀土化合物没有固溶到镁基体中,经进一步时效处理后,稀土化合物具有阻碍β相析出的作用。Ce含量由0增加到0.6%时,镁合金α相晶粒尺寸由102μm减小到31μm,降低约70%。随Ce含量增加,镁合金腐蚀速度降低。随腐蚀时间增加,腐蚀开始阶段时不同Ce含量镁合金腐蚀速度降低,达到15h后腐蚀速度增加。
The effects of rare earth element Ce on the microstructure and corrosion resistance of magnesium alloy were investigated by optical microscopy, X-ray diffraction, scanning electron microscopy and weight loss methods. The results show that with the increase of the content of Ce, the α phase in the as-cast microstructure of the magnesium alloy becomes thinner, and the β phase gradually changes from the mesh to the block. After heat treatment T4 rare earth compounds did not dissolve into the magnesium matrix, after further aging treatment, rare earth compounds have hindered the β-phase precipitation. When the Ce content increases from 0 to 0.6%, the α phase grain size decreases from 102μm to 31μm, about 70% lower. With the increase of Ce content, the corrosion rate of magnesium alloy decreases. With the increase of corrosion time, the corrosion rate of magnesium alloys with different Ce contents decreased at the initial stage of corrosion, and the corrosion rate increased after reaching 15h.