Sc对Al-6Mg-Zr铝合金在模拟海水中耐蚀性能的影响研究  

Effect of Scandium on the Corrosion Behavior of Al-6Mg-Zr Alloy in Artificial Seawater Environment

作　　者：陶斌武[1] 王克然[2] 刘建华[1] 李松梅[1] 

机构地区：[1]北京航空航天大学,北京100083 [2]沈阳飞机工业(集团)有限公司,辽宁沈阳110034

出　　处：《稀有金属材料与工程》2005年第9期1485-1488,共4页Rare Metal Materials and Engineering

摘　　要：采用中性盐雾、周期浸润等人工加速腐蚀试验和电化学测试方法,研究了Al-6Mg-Zr和Al-6Mg-Zr-Sc2种铝合金在模拟海水环境中的腐蚀行为。结果发现:在试验环境中2种铝合金都发生了点蚀;添加了Sc元素的Al-6Mg-Zr-Sc合金比Al-6Mg-Zr合金表现出更好的耐蚀性。自腐蚀电位和动电位阳极极化曲线研究也发现,添加Sc元素后铝合金的耐蚀性能增强。SEM/EDX分析表明,Al-6Mg-Zr-Sc合金中存在的Al3(Sc,Zr)复合相能细化晶粒、有效地抑制Al-6Mg-Zr合金中β相(Mg5Al8)的析出,使β相在合金基体中呈不连续分布,从而降低了合金的腐蚀敏感性。Corrosion behaviors of Al-6Mg-Zr and Al-6Mg-Zr-Sc alloys in artificial seawater were studied by using accelerated corrosion test and eleetrochemical measurement methods, It was found that etching pit was found on the surfaces of two alloys in the testing environments, and the resistance to corrosion of Al-6Mg-Zr-Sc was hetter than that of Al-6Mg-Zr alloy. By means of SEM/EDX. it was found that the, β-phrase precipitation in Al-6Mg-Zr-Sc alloys was distributed discontinuously due to the grain refinement effect of Al3（Sc,Zr）, which reduced the susceptibility to corrosion.

关 键 词：AL-MG合金 SC β相(Mg5Al8) 电化学测试 

分 类 号：TG174.3[金属学及工艺—金属表面处理]