Lead and lead alloys, with enhanced creep and/or...

H - Electricity – 01 – M

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H01M 4/68 (2006.01) C22C 11/00 (2006.01) C22F 1/12 (2006.01) H01M 4/82 (2006.01)

Patent

CA 2384700

Recrystallized lead and lead alloy positive electrodes for lead acid batteries having an increased percentage of special grain boundaries in the microstructure, preferably to at least 50 %, which have been provided by a process comprising steps of working or straining the lead or lead alloy, and subsequently annealing the lead or lead alloy. Either a single cycle of working and annealing can be provided, or a plurality of such cycles can be provided. The amount of cold work or strain, the recrystallization time and temperature, and the number of repetitions of such steps are selected to ensure that a substantial increase in the population of special grain boundaries is provided in the microstructure, to improve resistance to creep, intergranular corrosion and intergranular cracking of the electrodes during battery service, and result in extended battery life and the opportunity to reduce the size and weight of the battery.

La présente invention concerne des anodes en plomb recristallisé et en alliage au plomb destinées à des batteries plomb-acide, ces anodes se caractérisant par une augmentation du pourcentage de limites de grains spéciaux dans la structure, de préférence d'au moins 50%. Ces électrodes s'obtiennent par un processus de travail ou de bridage puis de recuit du plomb ou de l'alliage au plomb, éventuellement en plusieurs cycles de travail et recuit. La quantité de travail à froid ou de bridage, la durée et la température de recristallisation, ainsi que le nombre de cycles sont définis de façon à garantir qu'on aboutisse à une augmentation notable de la population de limites de grains spéciaux dans la microstructure, ce qui, d'une part permet une amélioration de la résistance au fluage, à la corrosion intergranulaire et à la formation de criques intergranulaires dans les électrodes pendant le service de la batterie, et d'autre part aboutit à une prolongation de la durée de vie des batteries tout en permettant de diminuer les dimensions et la masse de la batterie.

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