镁合金AZ31腐蚀性能研究  

Corrosion property of magnesium alloy AZ31

作　　者：况军[1] 李刚[1] 郝胜智[2] 相珺[1] 邱星武[1] 邱玲[1] 

机构地区：[1]辽宁工程技术大学材料科学与工程学院,辽宁阜新123000 [2]三束材料改性国家重点实验室,辽宁大连116024

出　　处：《兵器材料科学与工程》2009年第1期53-56,共4页Ordnance Material Science and Engineering

基　　金：大连理工大学三束材料改性国家重点实验室开放课题资助(0601)

摘　　要：利用强流脉冲电子束对镁合金AZ31表面进行快速铝合金化处理。分析表面合金化层的显微结构,测量铝合金化前、后镁合金AZ31样品在5%NaCl溶液中的腐蚀性能。测试结果表明,AZ31样品表面约10μm层深范围内的Al元素含量有所增加,合金化层的晶粒细化,加入的Al元素以固溶形式存在。表层铝元素的添加可提高镁合金AZ31的耐蚀性,原始样品自腐蚀电位为-1231mV,极化电阻为0.4531kΩ·cm2,铝合金化样品的自腐蚀电位提高到-669.1mV,对应极化电阻增加到2.202kΩ·cm2,较原始样品的极化电阻提高近5倍。The rapid surface alloying of AZ31 magnesium alloy by high current pulsed electron beam （HCPEB） was investigated. The microstructure of surface alloyed layer was analyzed and the corrosion property of AZ31 magnesium alloy samples in 5% NaCl solution before and after alloying was measured. The results show that within the scope of 10 μm deep layer,Al element content increases in the alloying layer and grain refines with Al element in the form of solid solution. Alloying aluminum on surface of AZ31 magnesium alloy can improve the corrosion resistance. The corrosion potential of the original sample is - 1 231 mV and the polarization resistance is 0.453 1 kΩ·cm2. After alloying, the corrosion potential increases to -669.1 mV and the polarization resistance improves to 2.202 kΩ·cm2. The polarization resistance increases almost five times than that of original sample.

关 键 词：强流脉冲电子束 合金化 镁合金 腐蚀性能 

分 类 号：TG166.4[金属学及工艺—热处理]