Sr对AZ31B镁合金微观组织和腐蚀性能的影响
Effect of Sr on Microstructure and Corrosion Resistance of AZ31B Magnesium Alloy
摘 要
研究了Sr对AZ31B镁合金显微组织和腐蚀性能的影响。当AZ31B中加入的Sr含量大于0.3%时, 合金组织中β相(Mg17Al12)减少, 分布更加弥散和均匀, 并且在晶界上形成了断续网状分布的Al4Sr相, 合金组织明显细化。当AZ31B中加入的Sr含量达到0.9%时腐蚀速率下降为AZ31B的50%。但Sr含量达到1.2%时, 晶界处出现共晶组织呈断续网状分布, 合金晶粒再度增大。
锶
显微组织
腐蚀
极化曲线
magnesium alloy
strontium
microstructure
corrosion
polarization curve
Abstract
The effect of strontium on microstructure and corrosion resistance of magnesium alloy was studied. When the addition of Sr was more than 0.3%, the amount of Mg17Al12 phase in the alloy decreased, and distribution became more uniform, reticular Al4Sr at grain boundaries formed and microstructure of the alloy was also refined obviously. The corrosion rate of AZ31 alloy with an addition of 0.9% Sr decreased to 50%. This was mainly caused by the formation of reticular Al4Sr phase, which acted as an effective barrier against corrosion and made the corrosion potential increased and the corrosion current density decreased. But when the Sr addition was more than 1.2%, eutectic structure distributed along with grain boundaries to form discontinued net-like structure and the grain size increased again.
中图分类号 TG174.2+1 TG146.2+2
所属栏目 试验研究
基金项目 国家973项目(No.2007CB613702)
收稿日期 2010/7/2
修改稿日期 2010/7/23
网络出版日期
作者单位点击查看
备注刘军威, 硕士研究生,
引用该论文: LIU Jun-wei,PENG Xiao-dong,LIU Ming-pu,MA Hong,WEI Qun-yi. Effect of Sr on Microstructure and Corrosion Resistance of AZ31B Magnesium Alloy[J]. Corrosion & Protection, 2011, 32(5): 345
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参考文献
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【9】Song G, Atrens A, Dargusch M. Influence of micro-structure on the corrosion of die cast AZ91D[J]. Corrosion Science, 1999, 41:249-273.
【2】Mathieu S, Rapin C, Steinmetz J, et al. A corrosion study of the main constituent phases of AZ91 magnesium alloys[J]. Corrosion Science, 2003, 45:2741-2755.
【3】Aliravci C A, Gruzleski L E, Dimayuga F C. Effect of strontium on the shrinkage micro porosity in magnesium sand castings[J]. AFS Transactions, 1992, 100:353-362.
【4】徐宋兵, 彭晓东. Mg-8Sr中问合金对AZ91晶粒细化的研究[J]. 轻合金加工技术, 2005, 33(10):29-32.
【5】张世军, 黎文献, 余琨. 铈对镁合金AZ31晶粒大小及铸态力学性能的影响[J]. 铸造, 2002, 51(12):767-771.
【6】Pettersen K, Lonhne O, Ryum N. Dendritic solidification of magnesium alloy AZ91[J]. Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science, 1990, 21A(1):221-230.
【7】Lee Y C, Dahle A K, St John D H. Role of Solute in Grain Refinement of Magnesium[J]. Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science, 2000, 31:2895-2906.
【8】刘生发, 王慧源. Sr对AZ91镁合金铸态组织的影响及其细化机制[J]. 稀有金属材料与工程, 2006, 35(6):970-973.
【9】Song G, Atrens A, Dargusch M. Influence of micro-structure on the corrosion of die cast AZ91D[J]. Corrosion Science, 1999, 41:249-273.
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