新型铝合金阳极在碱性海水溶液中的性能研究

Electrochemical performance of novel aluminum alloy anode in alkaline artificial sea water

为研究新型四元铝合金在碱性海水溶液中的电化学性能,探讨海水激活Al/AgO电池的最佳使用条件,采用稳态极化等方法,研究了新型四元铝合金阳极在碱性人工海水溶液中的电化学行为。结果表明:该合金具有较低的腐蚀速度和较高的电化学活性;NaOH质量分数为20％的人工海水溶液中,经退火处理过的铝合金阳极,在650mA/cm^2恒电流放电时,阳极电位为-1.48V(65℃,vs.Hg/HgO),氢气析出速率为0.11mL/(cm^2·min),活性物质利用率为97.2％;溶液中加入0.06moL/L Na_2SnO_3时阳极电位为-1.59V(90℃,vs.Hg/HgO),氢气析出速率为0.19mL/(cm^2·min),活性物质利用率为95.6％。

The investigation into the electrochemical performance of a novel quaternary aluminum alloy in a three-electrode system with alkaline artificial sea water by steady state polarization etc to obtain its better operational conditions for Al/AgO batteries indicates that the alloy has a lower corrosion rate and a higher electrochemical activity than that of the metal. In 20% NaOH artificial sea water, the alloy after annealing has an anodic potential of -1.48 V (vs.Hg/HgO at 65°C ) at a constant anodic current of 650 mA/cm2, a hydrogen evolution rate of 0.11 ml/(cm2&middotmin) , and a utilization ratio of 97.2%. It has an anodic potential of -1.59 V(vs. Hg/HgO at 90°C ), a hydrogen evolution rate of 0.19 ml/(cm2&middotmin), and a utilization ratio of 95.6% in the same solution containing 0.06 mol/L Na2SnO3. The electrochemical performance of the alloy after annealing and the effect of ambient temperature and inhibitor on it are discussed.