稀土Nd对Mg-6Zn-Mn镁合金组织和腐蚀性能的影响  

Effect of Nd on Microstructure and Corrosion Properties of Mg-6Zn-Mn Magnesium Alloy

作　　者：谢理明 李子全[1] 刘劲松[1] 丛孟启[1] 郭振汉[1] 盛备备 

机构地区：[1]南京航空航天大学材料科学与技术学院,江苏南京211106 [2]中信戴卡股份有限公司,河北秦皇岛066000

出　　处：《热加工工艺》2015年第7期55-59,共5页Hot Working Technology

基　　金：南京航空航天大学基本科研业务费NSFC培育基金资助项目(NN2012040)

摘　　要：利用Mg-30%Nd(质量分数)中间合金对Mg-6Zn-Mn(ZM61)合金进行了变质处理。通过显微组织观察、物相分析、动电位极化测试和浸泡实验研究了Nd含量对ZM61镁合金组织及腐蚀性能(3.5%Na Cl溶液中)的影响。结果表明,稀土Nd能够细化ZM61合金组织,提高其耐腐蚀性能。Nd含量增加,新生成的第二相在晶界处呈半连续网状分布。稀土Nd添加量达到1.5%时,合金的腐蚀电位比ZM61合金提高256m V,腐蚀电流密度降低为3.678×10-6A/cm2,腐蚀速率降低50%,耐腐蚀性最好。TheMg-6Zn-Mn （ZM61） magnesium alloy was modified by the Mg-30%Nd （mass fraction） interalloy. The effect of the Nd content on microstructure and corrosion properties （ in 3.5%NaCl solution） of ZM61 magnesium alloy were investigated by microstructure observation, phase analysis, potentiodynamic polarization test and immersion test. The results indicate that the microstructure of ZM61 magnesium alloy can be refined by rare earth Nd, and its corrosion resistance can be increased. When rare earth Nd reaches 1.5%, the corrosion potential of the alloy has increased by 256 mV as compared with that of ZM61 alloy, the corrosion current density has decreased to 3.678×10^-6A/cm^2, the corrosion rate has decreased by 50%, and the corrosion resistance is maximum.

关 键 词：ZM61 镁合金 稀土 ND 腐蚀性能 极化曲线 浸泡实验 

分 类 号：TG243[金属学及工艺—铸造] TG146.22[一般工业技术—材料科学与工程]