中国激光, 2008, 35 (9): 1395, 网络出版: 2008-09-09   

AZ91D镁合金Al-Si粉末激光合金化及腐蚀性能

Laser Alloying of Magnesium Alloy AZ91D with Al-Si Powder and Its Corrosion Performance
作者单位
北京工业大学激光工程研究院, 北京 100022
摘要
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。
Abstract
Laser alloying of magnesium alloy AZ91D with direct Al-Si power feeding for improvement of corrosion resistance was investigated. The relationship between laser alloying parameters and dimensions of alloyed layers was studied. The microstructural features of the alloyed layer were characterized by using scanning electronic microscope (SEM), energy disperse spectroscopy (EDS) and X-ray diffraction (XRD). Anodic polarization test was applied to evaluate the corrosion performance of AZ91D alloyed layer, which yielded enhanced corrosion resistance. The contribution of the intermetallic compounds (IMCs) of Mg2Si, Al12Mg17, Al3Mg2 in alloyed layers to corrosion resistance was studied.

李达, 钱鸣, 金昌, 李慧. AZ91D镁合金Al-Si粉末激光合金化及腐蚀性能[J]. 中国激光, 2008, 35(9): 1395. Li Da, Qian Ming, Jin Chang, Li Hui. Laser Alloying of Magnesium Alloy AZ91D with Al-Si Powder and Its Corrosion Performance[J]. Chinese Journal of Lasers, 2008, 35(9): 1395.

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