(1. 中南大学 材料科学与工程学院，长沙 410083；
2. 长沙矿冶研究院，长沙 410012)
摘 要: 采用感应熔炼法制备Mg-6%Al-5%Pb(质量分数)阳极材料，采用电化学法和化学浸泡法研究热处理对其电化学性能及腐蚀行为的影响，采用扫描电镜对其不同热处理状态下阳极材料的显微组织及腐蚀表面形貌进行观察。结果表明：Mg-6%Al-5%Pb阳极试样经100 ℃时效8 h处理后Al和Pb弥散分布在镁基体中，其稳定电位为−1.455 V(相对于标准氢电极)，腐蚀电流密度为0.063 mA/cm2，平均析氢速率为0.8 mL/(cm2·h)，表现出较好的综合性能；Mg-6%Al-5%Pb阳极的析氢在达到稳态之前存在孕育期，在孕育期内析氢速率较小，达到稳态以后析氢速率增大，直至趋于恒定。
关键字: 镁阳极；热处理；电化学性能；析氢行为
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Changsha Research Institute of Mining and Metallurgy, Changsha 410012, China）
Abstract:Mg-6%Al-5%Pb (mass fraction) anode material was prepared by the induction melting protected by argon. The electrochemical performances and corrosion behaviors of the anode specimens under different heat treatment conditions were studied by electrochemical measurements and immersion tests. The microstructures and the corroded surfaces of the anode specimens were examined by SEM. The results show that Mg-6%Al-5%Pb anode specimen aged at 100 ℃ for 8 h has the optimal performance with the stable potential of −1.455 V (vs SHE), corrosion current density of 0.063 mA/cm2 and average rate of hydrogen evolution of 0.8 mL/(cm2·h). There is an incubation period to the corrosion onset of Mg-6%Al-5%Pb anode, during which the hydrogen evolution rate is small. For long time immersion, the hydrogen evolution rate becomes linear and the process of corrosion achieves steady state.
Key words: magnesium anode; heat treatment; electrochemical performances; hydrogen evolution behavior
