Al-Ga-Mg-Sn-xSi阳极合金电化学性能研究  

Research on electrochemical performance of Al-Ga-Mg-Sn-xSi anode alloy

作　　者：邵海洋[1] 文九巴[1,2] 马景灵[1] 贺俊光[1] 王浩[1] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]河南省有色金属共性技术协同创新中心,河南洛阳471023

出　　处：《电源技术》2015年第3期502-505,共4页Chinese Journal of Power Sources

基　　金：河南省高校科技创新团队支持计划(2012IRTSTHN-008);河南省科技创新杰出人才计划(094200510019);河南省教育厅科技重点研究项目(12A430007)

摘　　要：熔炼并制备了铝空气电池用阳极材料Al-0.02Ga-0.5Mg-0.1Sn-x Si[x=0~0.2%（质量分数）]合金,通过测试合金的自腐蚀速率、开路电位（OCP）、极化曲线（Tafel）以及电化学阻抗（EIS）等,研究了其在4 mol/L Na OH溶液中的电化学性能;采用能量散射X射线谱（EDX）分析了合金中偏析相元素成分,并结合扫描电镜（SEM）观察了合金的腐蚀形貌。结果表明：合金中添加Si可降低自腐蚀速率,提高其电化学性能;但过量的Si会加剧合金点蚀。随着Si含量增加,合金开路电位负移,放电电压升高;当Si含量为0.1%时,合金具有最佳的综合性能,自腐蚀速率最小[0.113 mg/（cm^2·min）],开路电位最负（-1.80 V）,20 m A恒流放电时单电池电压达1.50 V。Al-0.02Ga-0.5Mg-0.1Sn-x Si（x=0~0.2%） anode alloy used for aluminum-air batteries were smelted. The electrochemical performance was studied by the measurement technique of self-corrosion rate, open circuit potential（OCP）, polarization curives（Tafel） and electrochemical impedance spectroscopy（EIS） in 4 mol/L Na OH electrolyte.The segregation phase composition and corrosion morphology were researched by energy dispersive x-ray detector（EDX） and scanning electron microscope（SEM）. The results show that the self-corrosion rate is lower through adding Si element, but adding more ones aggravate pitting. The electrochemical performance of anode alloys was improved,the OCP was more negative and discharge voltage rising. When 0.1% Si element was added, the best combination property could be obtained, the lowest self-corrosion rate[0.113 mg/（cm2·min）] and the negativest OCP（-1.80 V）.The discharge voltage was 1.50 V at 20 m A constant current discharge.

关 键 词：铝阳极材料 SI 电化学性能 腐蚀形貌 

分 类 号：TM91[电气工程—电力电子与电力传动]