Li_(2)CrO_(4)缓蚀剂对镁电池负极耐蚀性及电化学性能的改善  

Improvement of Corrosion Resistance and Electrochemical Performance of Magnesium Battery Negative Electrode by Li_(2)CrO_(4) Inhibitor

作　　者：胡启明 张芳聪 张娅 陈秋荣[1,3] HU Qiming;ZHANG Fangcong;ZHANG Ya;CHEN Qiurong(Jiaxing Engineering Center of Light Alloy Technology,Jiaxing 314000,China;College of Ocean Science and Engineering,Shanghai Maritime University,Shanghai 201306,China;Shanghai Institute of Micro-System and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China)

机构地区：[1]嘉兴中科轻合金技术工程中心,嘉兴314000 [2]上海海事大学海洋科学与工程学院,上海201306 [3]中国科学院上海微系统与信息技术研究所,上海200050

出　　处：《腐蚀与防护》2024年第8期22-27,共6页Corrosion & Protection

摘　　要：针对AZ31镁合金作为镁电池负极时存在自腐蚀速率大、阳极极化、电位滞后等问题,寻找合适的缓蚀剂及其用量调配电解液以提高电池的放电性能。通过腐蚀浸泡试验表征了缓蚀剂Li_(2)CrO_(4)的缓蚀效果,然后通过极化曲线、电化学阻抗谱研究了Mg(ClO_(4))_(2)溶液中Li_(2)CrO_(4)用量对AZ31镁合金电化学性能的影响,最后通过组装水系镁锰电池进行恒流放电作为应用端测试。结果表明:Li_(2)CrO_(4)能够使AZ31镁合金的腐蚀电位正移,最大正移量达到150 m V,在水系镁锰电池应用中能够提高镁电池的放电平台,当Li_(2)CrO_(4)质量分数为0.7%时放电平台提高0.15 V左右;当Li_(2)CrO_(4)质量分数为1.2%时,其能够显著改善AZ31镁合金在Mg(ClO_(4))_(2)溶液中的腐蚀,水系镁锰电池放电容量达最大,为196.9 m A·h,相对空白溶液,电池的放电容量提高约64%,工作电压高达1.39 V且放电曲线稳定。In respond to the problems of high free corrosion rate,anodic polarization,and potential hysteresis when AZ31 magnesium alloy is used as the negative electrode in magnesium batteries,suitable corrosion inhibitors and their dosage are sought to adjust the electrolyte to improve the discharge performance of the battery.The corrosion inhibition effect of the corrosion inhibitor Li_(2)CrO_(4) was characterized by corrosion immersion test.Then the effect of Li_(2)CrO_(4) dosage in Mg(ClO_(4))2 solution on the electrochemical properties of AZ31 magnesium alloy was studied by polarization curve and electrochemical impedance spectroscopy.Finally,the water-based magnesium-manganese battery was assembled for constant-current discharge as an application-side test.The results show that Li_(2)CrO_(4) made the corrosion potential of AZ31 magnesium alloy shift positively with a maximum of 150 mV,and could improve the discharge platform of magnesium battery in the application of aqueous Mg-Mn battery.When the mass fraction of Li_(2)CrO_(4) was 0.7%,discharge platform could be increased by about 0.15 V.When the mass fraction of Li_(2)CrO_(4) was 1.2%,the corrosion of AZ31 magnesium alloy could be significantly improved in Mg(ClO_(4))2 solution,the discharge capacity of the aqueous magnesium manganese battery was up to 196.9 mA·h,which increased by more about 64%in comparison with blank solution,and the operating voltage was up to 1.39 V with a stable discharge curve.

关 键 词：Li_(2)CrO_(4) AZ31镁合金 放电行为 电化学行为 

分 类 号：TM911.1[电气工程—电力电子与电力传动]