何海盛, 王松林, 史嘉麟, 杨俊杰, 廖伯凯, 李慧珍. 螯合型添加剂对Mg-3Al-5La合金阳极界面产物沉积与活化行为调控[J]. 中国腐蚀与防护学报, 10.11902/1005.4537.2026.255.

摘要 相关文章 Metrics 全文: PDF(2170 KB)   摘要: 针对镁合金阳极在海水电解液中因界面腐蚀产物堆积导致放电活性衰减的问题，本研究以Mg-3Al-5La合金为对象，通过引入氨基多羧酸类螯合剂（NTA、HIDA和IDA）构建改性电解液，结合微观表征、电化学测试及理论计算揭示了螯合剂对阳极界面产物沉积与活化行为的调控机制。结果表明，在1mA/cm2电流密度下，螯合剂通过分子络合作用和Al11La3第二相空间阻隔的协同效应，有效抑制了界面腐蚀产物的连续生长，诱导合金表面形成蜂窝网格状的均匀溶解形貌，并使电化学阻抗谱的中频相位角峰值显著降低，从而保证合金稳定活化。其中，NTA凭借最强的络合能力，可维持-1.73V的极负放电电位，自腐蚀电流密度达1.47mA/cm2，活化效能最为突出。然而，当电流密度升至10 mA/cm2时，腐蚀产物生成速率远超螯合剂络合清除能力，此时添加剂界面活化效果显著减弱。理论计算进一步证实，NTA分子因多齿配位结构形成了超深静电势阱，将Mg(OH)2沉淀临界pH值推高至11.5以上，从热力学层面确立了其最优的界面调控能力。 关键词 ： 镁空气电池,  氨基多羧酸类螯合剂,  Mg-3Al-5La合金,  界面调控     Abstract：To address the discharge‑activity decay of magnesium‑alloy anodes caused by interfacial corrosion‑product accumulation in seawater‑based electrolytes, this work takes the Mg‑3Al‑5La alloy as the research object. Modified electrolytes are constructed by introducing aminopolycarboxylic acid chelators (NTA, HIDA and IDA). Combined with microscopic characterizations, electrochemical measurements and theoretical calculations, the modulation mechanism of chelators on interfacial‑product deposition and activation behavior of the anode is revealed. The results demonstrate that at a current density of 1mA/cm2, chelators exert the synergistic effect of molecular complexation and spatial barrier from the Al11La3 second phase. They effectively suppress the continuous growth of interfacial corrosion products, induce a honeycomb‑grid‑like uniform dissolution morphology on the alloy surface, and markedly reduce the intermediate‑frequency phase‑angle peak in electrochemical impedance spectra, so as to maintain stable activation of the alloy. Among them, NTA delivers the most prominent activation performance benefiting from its strongest complexation capacity. It maintains a highly negative discharge potential of -1.73 V with a self‑corrosion current density of 1.47 mA/cm2. Nevertheless, when the current density increases to 10 mA/cm², the generation rate of corrosion products far exceeds the complex‑removal capacity of chelators, and the interfacial‑activation effect of additives is substantially weakened. Theoretical calculations further verify that NTA molecules form an ultra‑deep electrostatic potential well owing to their multidentate coordination structure. They raise the critical pH for Mg(OH)2 precipitation above 11.5, which underpins its optimal interfacial‑modulation capability from the thermodynamic perspective. Key words： Magnesium-air batteries    Aminopolycarboxylic acid chelator    Mg-3Al-5La alloy    Interface regulation 收稿日期: 2026-08-12      基金资助:教育部基础学科和交叉学科突破计划(JYB2025XDXM802); 广东省基础与应用基础研究基金资助项目(2025A0505020053); 广东省基础与应用基础研究基金资助项目(2024A1515030004); 工业流体节能与污染控制教育部重点实验室开发基金(CK-2024-0045) 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 何海盛 王松林 史嘉麟 杨俊杰 廖伯凯 李慧珍 44.8K 链接本文: https://www.jcscp.org/CN/Y0/V/I/0 [1] 王博, 安士忠, 郭俊卿, 纪运广, 李志强. 商用MB1和MB8镁合金在NaCl溶液中的电化学性能[J]. 中国腐蚀与防护学报, 2024, 44(4): 1073-1080. [2] 李亚琼,马景灵,王广欣,朱宇杰,宋永发,张景丽. NaPO3与SDBS缓蚀剂对AZ31镁合金空气电池在NaCl电解液中放电性能的影响[J]. 中国腐蚀与防护学报, 2018, 38(6): 587-593. Viewed Full text Abstract Cited   Shared      Discussed