均匀化退火对Mg-6Al-5Pb-0.6Ce镁阳极组织和性能的影响
Effect of Homogenization on Microstructure and Properties of Mg-6Al-5Pb-0.6Ce Magnesium Anode
摘 要
采用熔炼铸造法制备Mg-6Al-5Pb-0.6Ce合金阳极材料，采用X射线衍射(XRD)、环境扫描电镜(ESEM)研究均匀化退火对Mg-6Al-5Pb-0.6Ce合金显微组织的影响；采用恒电流放电、动电位极化扫描研究均匀化退火前后该镁合金的腐蚀电化学性能。结果表明: 经400 ℃均匀化退火24 h后，合金中呈岛状分布的β-Mg17Al12相完全固溶于镁基体，成分偏析基本消除；与铸态合金相比，均匀化退火态合金中有效阴极相(β-Mg17Al12相)的消失使合金电偶腐蚀减少，耐蚀性提高；均匀化退火后，合金的平均放电电位从-1.756 V(相对SCE,下同)正移到-1.726 V，放电活性略微减弱，而阳极利用率提高5.1%，达到79.8%。
均匀化退火
显微组织
电化学性能
magnesium alloy
homogenizing annealing
microstructure
electrochemical performance
Abstract
Mg-6Al-5Pb-0.6Ce alloy anode was prepared by melting and casting. The effect of homogenization on microstructure of this alloy was investegated by XRD and SEM. Its corrosion and electrochemical behavior before and after homogenization of the alloy were studied by potentiodynamic plorization and galvanostatic discharge. The results indicated that the island-like β-Mg17Al12 phase was dissolved into the magnesium matrix and the composition segregation almost disappeared after homogenizing at 400 ℃ for 24 h. Compared with the as-cast alloy, the disappearance of the effective cathodic phase (β-Mg17Al12) in the homogenized alloy led to a decrease of galvanic corrosion and an improvement of corrosion resistance. Moreover, the discharge potential of Mg-6Al-5Pb-0.6Ce magnesium anode was shifted from -1.756 V (SCE) to -1.726 V (SCE) after homogenization, resulting in a weakening of the discharge activity. However, its anode utilization efficiency reached 79.8%, which was 5.1% higher than that of the as-cast alloy.
中图分类号 TG146.2 DOI 10.11973/fsyfh-201603001
所属栏目 试验研究
基金项目 国家自然科学基金青年科学基金项目(51401243)； 中国博士后科学基金面上资助(2014M552151)
收稿日期 2015/3/12
修改稿日期
网络出版日期
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备注王日初(1965-),教授,博士,从事海水激活电池阳极材料研究
引用该论文: HU Cheng-wang,WANG Ri-chu,PENG Chao-qun,FENG Yan,WANG Nai-guang. Effect of Homogenization on Microstructure and Properties of Mg-6Al-5Pb-0.6Ce Magnesium Anode[J]. Corrosion & Protection, 2016, 37(3): 183
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【2】WANG N G,WANG R C,PENG C Q,et al. Influence of aluminium and lead on activation of magnesium as anode[J]. Transactions of Nonferrous Metals Society of China,2010,20(8):1403-1411.
【3】王乃光,王日初,余琨,等. 合金化及热处理对镁合金阳极材料组织及性能的影响[J]. 中国有色金属学报,2009,19(1):38-43.
【4】WANG N G,WANG R C,PENG C Q,et al. Corrosion behavior of magnesium alloy AP65 in 3.5% sodium chloride solution[J]. Journal of Materials Engineering and Performance,2011,21(7):1300-1308.
【5】KHOMAMIZADEH F,NAMI B,KHOSHKHOOEI S. Effect of rare-earth element additions on high-temperature mechanical properties of AZ91 magnesium alloy[J]. Metallurgical and Materials Transactions A,2005,36(12):3489-3494.
【6】刘楚明,葛位维,李慧中,等. Er对铸态AZ91镁合金显微组织和耐腐蚀性能的影响[J]. 中国有色金属学报,2009,19(5):847-853.
【7】杨洁,易丹青,邓姝皓,等. 微量Ce对AZ91镁合金微观组织及耐蚀性的影响[J]. 中国腐蚀与防护学报,2008,28(4):205-209.
【8】SONG Y L,LIU Y H,WANG S H,et al. Effect of cerium addition on microstructure and corrosion resistance of die cast AZ91 magnesium alloy[J]. Materials and Corrosion,2007,58(3):189-192.
【9】冯艳,王日初,彭超群. 海水电池用镁阳极的研究与应用[J]. 中国有色金属学报,2011,21(2):259-268.
【10】金和喜,王日初,彭超群,等. 固溶处理对Mg-6Al-5Pb-1.5In阳极腐蚀电化学性能的影响[J]. 中国有色金属学报,2013,23(2):403-409.
【11】AUNG N N,ZHOU W. Effect of heat treatment on corrosion and electrochemical behaviour of AZ91D magnesium alloy[J]. Journal of Applied Eletrochemistry,2002,32:1397-1401.
【12】ZHOU W,SHEN T,AUNG N N. Effect of heat treatment on corrosion behaviour of magnesium alloy AZ91D in simulated body fluid[J]. Corrosion Science,2010,52:1035-1041.
【13】WANG N G,WANG R C,PENG C Q,et al. Discharge behaviour of Mg-Al-Pb and Mg-Al-Pb-In alloys as anodes for Mg-air battery[J]. Electrochimica Acta,2014,149:193-205.
【14】ASL K M,MASOUDI A,KHOMAMIZADEH F. The effect of different rare earth elements content on microstructure,mechanical and wear behavior of Mg-Al-Zn alloy[J]. Materials Science and Engineering A,2010,527(7/8):2027-2035.
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【22】ANDREI M,GABRIELE F D,BONORA P L,et al. Corrosion behaviour of magnesium sacrificial anodes in tap water[J]. Materials and Corrosion,2003,54(1):5-11.
【23】FENG Y,WANG R C,PENG C Q. Influence of alloying elements on electrochemical behavior of Mg-Hg-Ga anodes[J]. Journal of Materials Science and Engineering,2011,29(4):489-516.
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