摘要
用交流阻抗(EIS)和交流伏安(ACV)法研究了纯铅、铅锡以及两种Pb Ca Sn Al合金在900mV(vs.Hg/Hg2SO4)极化不同时间后的行为。测试表明腐蚀膜是由外层的PbSO4和内部的PbO构成,PbO的导电性较差,是形成钝化层的主要原因,加Sn有助于降低PbO的厚度,有效防止钝化层的形成。原因可能是由于Sn的氧化产物导电性较好,夹杂到腐蚀膜中提高了腐蚀膜的导电性,并有利于导电性PbOx的生成,保证电池在深循环条件下的应用。但对于长时间的极化来说,钝化层的导电性还是逐渐降低,这可能是由于锡的氧化物又逐渐溶解于硫酸中所造成的。
The behaviour of lead and leadtin binary alloys and two kinds of PbCaSnAl alloys was investigated by means of electrochemical impedance spectroscopy(EIS) after different polarization time at 900?mV(vs. Hg/Hg2SO4).The impedance data showed that the inner PbO barrier layer was formed beneath the initially grown PbSO4 porous layer and alloying tin could increase the electron conductivity of the passivation layer, possibly through the process of percolation with conducting tin oxide,but for long polarization time,a decrease of the conductivity was observed.The behaviour could be explained by the slow dissolution of tin oxide in sulfuric acid.
出处
《电池》
CAS
CSCD
北大核心
2003年第3期139-141,共3页
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