Effect of Base Lead Composition on Metallurgical Properties of Maintenance‐Free Battery Alloys

Abstract
The effects of trace element additions on the microstructure and age‐hardening properties of Pb‐Ca and Pb‐Ca‐Sn alloys for maintenance‐free batteries are reported. A specific laboratory casting procedure duplicating grid solidification conditions and the solidification‐cast property relationships upon which it is based are discussed. It was found that bismuth, antimony, copper, and silver in amounts typical of high bismuth primary and refined secondary base leads have little or no influence on microstructure in Pb‐0.085Ca and Pb‐0.085Ca‐0.8Sn. The addition of trace elements increased the early hardness of Pb‐0.085Ca‐0.8Sn but had no effect in Pb‐0.085Ca.

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