SILVER-BARIUM LEAD ALLOY FOR LEAD-ACID BATTERY GRID

摘要

PROBLEM TO BE SOLVED: To provide an improved silver-barium lead alloy for use in the manufacture of a lead-acid battery positive grids, that improves ordinary temperature aging process required to attain hardness and strength required during pasting, hardening and subsequent processings of the battery grid. SOLUTION: The lead alloy for a lead-acid battery grid, essentially comprises calcium of about 0.05 to 0.07 wt.%, tin of about 0.09 to 1.3 wt.%, silver of about 0.006 to 0.010 wt.%, barium of about 0.0100 to 0.0170 wt.% and aluminum of about 0.015 to 0.025 wt.%, with the rest being lead. The lead alloy can improve an age hardening step, by dispensing with a high temperature treatment process required for a silver alloy, in the manufacture of a lead-acid battery. The use of the lead alloy prolongs a service life of the lead-acid battery further by increasing corrosion resistance and mechanical strength of a battery grid manufactured by a book molding method. A reduced silver level used drastically relieves a problem of silver removal from a recycled lead flow in secondary production of the metal.