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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 2    April 2002

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Corrosion mechanism of mechanically
alloyed Mg50Ni50 and Mg45Cu5Ni50 alloys
ZHANG Yao(张  耀), LI Shou-quan(李寿权), CHEN Li-xin(陈立新),
LEI Yong-quan(雷永泉), WANG Qi-dong(王启东)

Department of Materials Science and Engineering,
Zhejiang University, Hangzhou 310027, China

Abstract:As the loss of active material Mg may affect electrode's discharge capacity and the cycling stability, a more refined mechanism study on cycling capacity de gradation should be made. The present investigation is based on the supposition that the capacity degradation of the binary Mg50Ni50 alloy and ternary Mg45Cu5Ni50 alloy electrodes is solely due to the corrosion of Mg, the active hydrogen storage element. That means amount of capacity degradation is determined by the corrosion current time, which is also the time of operation. The corrosion current Jcorr dependence on cycling time was deduced. A mathematic relation between the cycling capacity retention CN/C1 (%) and the duration of operation was also deduced. The data calculated from the equations deduced agree well with those of the experiment result. The loss of the active hydrogen-absorbing element Mg is proved to be the main cause for cycling capacity deterioration in the present investigation.

 

Key words: mechanism of degradation; cycling capacity degradation; corrosion current; MgNi-based alloys

ISSN 1672-7029
CN 43-1423/U

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