Corrosion and discharge performance of Mg-9%Al-2.5%Pb alloy as anode for seawater activated battery
(School of Materials Science and Engineering, Central South University, Changsha 410083, China)
Abstract: To obtain a new kind of Mg-Al-Pb alloy anode material with low content of Pb, the corrosion and discharge behavior of Mg-9%Al-2.5%Pb (hereafter in mass fraction) alloy were investigated by immersion tests and electrochemical techniques, and compared with those of Mg-6%Al-5%Pb alloy. The results indicate that Mg-9%Al-2.5%Pb alloy exhibits a lower self-corrosion rate and higher utilization efficiency in contrast with Mg-6%Al-5%Pb alloy because of the higher content of Al. As the result of the decrease of Pb content, the discharge activity of Mg-9%Al-2.5%Pb alloy is relatively weaker but still meets the requirement of anode. These results reveal that Mg-9%Al-2.5%Pb alloy with a low content of Pb can serve as a good candidate for the anode material used in seawater activated battery.
Key words: Mg-Al-Pb alloy; anode material; self-corrosion rate; utilization efficiency; discharge activity