Zn离子对镁合金表面显微形貌及耐蚀性的影响研究  

Effect of Zn ion on microstructure and corrosion resistance of magnesium alloy

作　　者：王晓波[1] 全风美[1] 李盛和[1] 姜云波[1] 谢志强[1] 

机构地区：[1]中国工程物理研究院,四川绵阳621900

出　　处：《轻合金加工技术》2013年第7期39-42,53,共5页Light Alloy Fabrication Technology

摘　　要：用金属离子注入的方法(MEVVA)在AZ31镁合金基底上注入Zn进行表面改性。用金相显微镜、扫描电镜及XPS对试件表面显微形貌及元素分布进行测试,用电化学测试的方法对试件表面的电化学腐蚀特性进行测试。结果表明,在Zn注入剂量较少时,Zn元素在试件表面分布较为均匀,Zn元素含量超过Zn在镁中的最大固溶度。当Zn注入剂量较大时,会在AZ31镁合金晶界处发生Zn元素富集,使晶界轮廓显现。适量的注Zn有利于提高AZ31镁合金表面的电化学腐蚀性能,但当Zn的注入剂量较大时,由于Zn在AZ31镁合金晶界处的富集使其电化学腐蚀性能有所下降。The AZ31 magnesium alloy material surface has been modified by Zn ion implanting using metal vapor vacuum are （MEVVA） technique. The microstructure and element distribution of the sample surface have been analyzed by metallurgical microscope, scanning electron microscope（SEM） and X-ray photoelectron spectroscopy （XPS）. The corrosion resistance of the sample surface has been investigated by electro-chemical corrosion as well. The results show that Zn elements distributed evenly on the sample surface when implanted Zn dosage is small, the Zn element contents are higher than solubility of implanted Zn in magnesium. However when implant a large content of Zn, the Zn elements gathered at grain boundary of AZ31 magnesium alloy and made the crystal contour appears. To implant a suitable content of Zn into the AZ31 magnesium alloy can increase electro-chemical corrosion resistance of AZ31 magnesium alloy, but the electro-chemical corrosion resistance would be decreased if the implanted Zn dosage too high, this is due to the Zn ions gathered at the crystal boundary.

关 键 词：金属离子注入(MEVVA) 显微形貌 耐蚀性 

分 类 号：TG174.444[金属学及工艺—金属表面处理]