含稀土耐蚀Mg-9Al铸造镁合金腐蚀行为研究
CORROSION BEHAVIOR OF DIE-CAST Mg-9Al MAGNESIUM ALLOY WITH RE ADDITION
摘 要
通过盐雾、失重及析氢等腐蚀试验研究了新研制的含稀土的Mg-9Al铸造镁合金AR091在3.5%NaCl溶液中的腐蚀行为,并与目前常用的ZM5和AZ91D镁合金的腐蚀行为进行了对比.结果表明,AR091具有良好的耐腐蚀性能.AR091的微观组织与AZ91有明显差别,其晶粒更为细小,β相明显减少,还存在许多针状含稀土元素(RE)的析出相.合金内各相间的微电偶腐蚀明显减弱,阴极反应过程受到抑制.采用场发射扫描电镜(FESEM)及俄歇电子谱(AES)研究比较了合金的表面腐蚀产物膜,结果表明,在AR091合金表面能形成更为致密、保护性更好的腐蚀产物膜.
腐蚀
稀土
Magnesium alloy
Corrosion
Rare earth
Abstract
The corrosion behavior of die-cast Mg-9Al magnesium alloy with RE addition (AR091) has been evaluated by general corrosion measurements and electrochemical methods in 3.5% NaCl solution saturated with Mg(OH)2.The experimental results were compared with those of commercial magnesium alloy ZM5 and AZ91D.AR091 magnesium alloy has better corrosion resistance than ZM5 and AZ91D alloy.The microstructure of AR091,ZM5 and AZ91D were examined by Electron Probe Microanalysis (EPMA) and Energy Dispersion Spectroscopy (EDS).The AR091 magnesium alloy showed microstructure characterized by α-phase solid solution,surrounded by less β-phase and more needle-like RE-containing phase.The excellent corrosion resistance of the AR091 alloy could be explained by the fact that the precipitated RE-containing phases are less cathodic.Moreover,the corrosion product film formed on the AR091 alloy surface was more protective.
中图分类号 TG172 TG146.2+2
所属栏目 试验研究
基金项目 上海市科委科技攻关计划重点项目(045211082)
收稿日期 2006/4/25
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引用该论文: ZHOU Xue-hua,WEI Zhong-ling,CHEN Qiu-rong,CHEN Kai-sheng,HUANG Yuan-wei. CORROSION BEHAVIOR OF DIE-CAST Mg-9Al MAGNESIUM ALLOY WITH RE ADDITION[J]. Corrosion & Protection, 2006, 27(10): 487～491
被引情况:
【1】吴多祥,吴志林,袁人枢,赵磊,赵言宝, "静液挤压制备的AZ80镁合金管材的腐蚀行为",腐蚀与防护 36, 957-962(2015)
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参考文献
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【3】余刚,刘跃龙,李瑛,等.Mg合金的腐蚀与防护[J].中国有色金属学报,2002,12(6):1087-1098.
【4】Song G,Atrens A,Stjohn D,et al.The electrochemical corrosion of pure magnesium in 1N NaCl[J].Corrosion Science,1997,39:855-875.
【5】Gray J E,Luan B.Protective coatings on magnesium and its alloys-a critical review[J].Journal of Alloys and Compounds,2002,336:88-113.
【6】卫中领,陈秋荣,郭歆聪,等.镁合金微弧氧化膜的微观结构及耐蚀性研究[J].材料保护,2003,36(10):7-9.
【7】Makar G L,Kruger J.Corrosion studies of rapidly solidified magnesium alloys[J].J Electrochem Soc,1990,137:414-421.
【8】Schmutz P,Virtanen S,Kocher L,et al.Corrosion behavior of novel Mg-Al alloys produced by means of the new rheocasting (NRC) process[J].Electrochemical Society Proceeding,2000,23:157-165.
【9】Song G,StJohn D. The effect of zirconium grain refinement on the corrosion behavior of magnesium-rare earth alloy MEZ[J].Journal of Light Metals,2002,2:1-16.
【10】黄 亮,黄元伟,王晨,等.含稀土元素的Mg-Al合金在NaCl溶液中腐蚀产物膜的研究[J].中国腐蚀与防护学报,2002,22:167-171.
【11】Lunder O,Lein J E,Kr T,et al.Nisancioglu.The role of Mg17Al12 phase in the Corrosion of Mg Alloy AZ91[J].Corrosion,1989,45:741-748.
【12】Song G,Atrens A,Dargusch M.Influence of microstructure on the corrosion of diecast AZ91D[J].Corrosion Science,1999,41:249-273.
【13】Song G,Atrens A,Wu X,et al.Corrosion behavior of AZ21 and AZ91 in sodium chloride[J].Corrosion Science,1998,40:1769-1791.
【14】Dargusch M S,Dunlop G L,Pettersen K.Magnesium alloys and their applications[A].Proc Volume sponsored by Volkswagen AG,B.L.mordike and K.U.Kainer,Eds.,Werkstoff-Informationsgesellschaft,Frankfurt,Germany[C].1998.
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