定向凝固对光伏系统用VRLA电池Pb-Sb板栅合金电化学性能的影响  

The effect of unidirectional solidification on the electrochemical performances of Pb-Sb alloy for VRLA batteries used in solar energy photovoltaic power system

作　　者：黄琼[1] 苏勇[2] 朱晓勇[2] 周玉婷[2] 阮伟 

机构地区：[1]安徽职业技术学院电气工程系,安徽合肥230011 [2]合肥工业大学材料科学与工程学院,安徽合肥230009 [3]安徽海容电源动力有限公司,安徽合肥238014

出　　处：《蓄电池》2012年第6期250-255,共6页Chinese LABAT Man

基　　金：2012年安徽省高等学校省级自然科学研究项目(kj2012B080)

摘　　要：采用交流阻抗法、塔菲尔曲线法、阴极极化等电化学测试对定向凝固Pb-Sb板栅合金进行电化学性能测试,并用金相显微镜观察微观组织。结果表明:熔体过热处理后的合金做为籽晶的定向凝固试样,其晶粒细化,枝晶间距变小,枝晶分叉减少,且晶体组织更加均匀。在距液淬底面40 mm处,熔体转变后的钝化电流密度明显小于转变前的电流密度,表明其在钝化状态下的腐蚀速度变小,合金的耐腐蚀性增强。The effect of unidirectional solidification on the electrochemical behavior of the Pb-Ca alloys was studied by use of electrochemical impedance spectroscopy, Tafel plot and cathodic potentiodynamic polarization. Metallographic microscope was taken to investigate the microstructure. It was found that the grain size was refined, arm distance was narrowed, crystal branehes were reduced and the microstructure was well-distributed of the unidirectional solidification sample with substrate processed by melt superheat treatment. After melt structure transformation process, the critical passivation current density was less than before at 40 ram, whieh observed that its corrosion rate was reduced and the corrosion resistance was increased.

关 键 词：定向凝固 铅锑合金 电化学性能 熔体过热处理 液淬 

分 类 号：TM912.9[电气工程—电力电子与电力传动]