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为研究热处理后La-Mg-Ni系合金的循环容量衰减机理,制备铸态及热处理后La0.80Mg0.20Ni3.70合金。结果表明,合金经热处理后,其循环容量衰减速率减小。热处理后合金中各物相间Mg和Ni元素的浓度差降低。随热处理温度升高,合金中各相间电化学腐蚀的混合腐蚀电位绝对值和最大腐蚀电流先减小后增加,950℃热处理后合金明显好于其他合金。合金颗粒粉化、活性元素的氧化以及各相间的电化学腐蚀是合金电极失效的重要原因。
In order to study the mechanism of the cyclic capacity fading of La-Mg-Ni alloy after heat treatment, La0.80Mg0.20Ni3.70 alloy was prepared after as-cast and heat-treated. The results show that the heat treatment of the alloy, the cycle capacity decay rate decreases. After heat treatment, the content of Mg and Ni in each phase decreased. With the increase of the heat treatment temperature, the absolute value of the mixed corrosion potential and the maximum corrosion current of the electrochemical corrosion of all phases in the alloy first decrease and then increase, and the alloy after 950 ℃ heat treatment is obviously better than the other alloys. Particle pulverization of alloy particles, oxidation of active elements and electrochemical corrosion of the phases are the main reasons for the failure of the alloy electrodes.