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采用Al-Si粉末对AZ91D镁合金进行了同步送粉激光合金化研究,以期改善镁合金的耐腐蚀性能。讨论了激光加工参数与合金化层几何尺寸的对应关系;采用扫描电镜(SEM)、能谱分析仪(EDS)、X射线衍射仪(XRD)等材料表征手段分析了合金化层显微组织的结构特征。通过阳极极化实验评价了AZ91D镁合金激光合金化组织的腐蚀性能。结果表明,AZ91D镁合金激光合金化表层的耐腐蚀性能明显提高;剖析了Mg2Si,Al12Mg17,Al3Mg2等金属间化合物(IMC)的耐腐蚀作用。
Al-Si powder AZ91D magnesium alloy was simultaneously fed powder laser alloying research, with a view to improve the corrosion resistance of magnesium alloys. The relationship between the laser processing parameters and the geometry of the alloyed layer was discussed. The microstructure of the alloying layer was analyzed by SEM, EDS and XRD. Structure. The corrosion behavior of AZ91D magnesium alloy laser alloyed alloy was evaluated by anodic polarization experiments. The results show that the corrosion resistance of AZ91D magnesium alloy surface layer is obviously improved. The corrosion resistance of intermetallic compound (IMC) such as Mg2Si, Al12Mg17 and Al3Mg2 is also analyzed.