CAJ | 학술논문

AZ21镁合金在硫酸镁溶液中会产生表面膜,导致严重的电压滞后问题.加载脉冲电流可以减少AZ21镁合金的滞后时间,缩短放电初期时的电压降,降低平衡电压,提高放电平稳性等,有利于AZ21镁合金在电池中的应用.本文利用恒电流法、多电流阶跃法、电化学阻抗、扫描电镜等多种方法对AZ21镁合金在2 mol·L-1的MgSO4溶液的电压滞后问题进行实验研究.结果表明,经50 mA脉冲电流1 s后,AZ21的电压滞后时间可从6.35 s (3.23 V)降至0.59 s (0.034 V).
AZ21미합금재류산미용액중회산생표면막,도치엄중적전압체후문제.가재맥충전류가이감소AZ21미합금적체후시간,축단방전초기시적전압강,강저평형전압,제고방전평은성등,유리우AZ21미합금재전지중적응용.본문이용항전류법、다전류계약법、전화학조항、소묘전경등다충방법대AZ21미합금재2 mol·L-1적MgSO4용액적전압체후문제진행실험연구.결과표명,경50 mA맥충전류1 s후,AZ21적전압체후시간가종6.35 s (3.23 V)강지0.59 s (0.034 V).
A surface film generates on AZ21 magnesium alloy in magnesium sulfate solutions, resulting in serious voltage delay. Pulse current is conducive to the application of AZ21 magnesium alloy in a battery, for it can shorten the lag time, reduce the initial discharge voltage drop and increase the discharge stability. The voltage delay of AZ21 magnesium alloy in a 2 mol·L-1 MgSO4 solution was investigated by chronopotentiometry, multi-current steps, electrochemical impedance measurement, and scanning electron micros-copy. After a 50 mA pulse current was applied for 1 s, the voltage lag time of AZ21 magnesium alloy decreased from 6. 35 s (3. 23 V) to 0. 59 s (0. 034 V).