强流脉冲离子束辐照挤压态AZ31镁合金性能  

Properties of extruded magnesium alloy AZ31 irradiated by high intensity pulsed ion beams

作　　者：陈占兴[1] 张罡[1] 曲家惠[2] 娄长胜[1] 

机构地区：[1]沈阳理工大学中俄联合高能束流实验室,辽宁沈阳110159 [2]沈阳理工大学装备工程学院,辽宁沈阳110159

出　　处：《金属热处理》2012年第10期50-53,共4页Heat Treatment of Metals

基　　金：国家科技部国际合作项目(2004DFA04800)

摘　　要：利用强流脉冲离子束(C+、H+)对变形镁合金AZ31的挤压态靶材分别进行0、1、30和50次辐照试验,分析辐照前后物相组成,检测随辐照次数增加靶材表面的显微硬度,并通过阳极氧化和盐雾试验检测耐蚀性能。结果表明,随HIPIB辐照次数增加,靶材表面显微硬度呈提高趋势,50次辐照表面显微硬度270 HV0.01,较原始靶材的63.7 HV0.01提高了3倍多;极化曲线显示自腐蚀电位和击穿电位提高,自腐蚀电流减小,30次辐照的自腐蚀电位达到-1363 mV,钝化区间为1065 mV;辐照处理后在盐雾试验中形成钝化膜使靶材腐蚀速率显著降低了65%,耐蚀性能得到较大改善。High intensity pulsed ion beam （ C ＋ , H ＋ ） irradiation of extruded magnesium alloy AZ31 target was carried out with irradiation shot times of 1,30 and 50, respectively. The surface microhardness and phase structure of irradiated samples were characterized. Corrosion resistance feature of irradiated samples was measured by using potentiodynamie polarization technology and salt spray test in order to explore the effect of HIPIB irradiation on magnesium alloy AZ31. The results show that the times of HIPIB irradiation play a great role on the target microhardness. The surface microhardness increases straightly after the first to 50th irradiation. The microhardness of the surface reaches a maximum of 270 HV0. 01, which is three times higher than the original target 63.7 HV0.01. Polarization curves of irradiated samples show that the corrosion current is decreased slightly, and the corrosion potential and critical breakdown potential are increased respectively; corrosion potential of 30 shots reaches to -1363 mV ,and passivation potential is 1065 inV. The results of the surface morphology of the salt spray corrosion indicated that HIPIB irradiation leads to a significant improvement in corrosion resistance of magnesium alloy, in terms of the corrosion rate depresses by 65%.

关 键 词：强流脉冲离子束(HIPIB) 挤压态AZ31镁合金 显微硬度 耐蚀性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理]