CORROSION-RESISTANT COATING FOR A POSITIVE LEAD-ACID-BATTERY ELECTRODE

Barium metaplumbate, a conductive ceramic having the perovskite structure, was successfully applied to the surface of a lead grid. A layer of lead metal was plated on the BaPbO3 coated for further protection. A lead/acid battery constructed with the coated g rids showed a better float life compared to that without the coating. At the end of an 18 week accelerated float life test, the area of the control grid increased by about 15% while no visible change on the coated grid was noticed. The cross-sectional micrographic analysis of the tested grid revealed much less corrosion for the coated one. A lead/acid battery designed for a long service life, such as an uninterrupted power system in which the grid creep is the major failure mode, can be benefited from the barium metaplumbate coating.