PURPOSE: To obtain a lead alloy material for a lead storage battery inhibiting the intergranular corrosion and general corrosion of its plate grid by dissolving the surface of a Pb-Ca alloy material, sticking Sn, Ag, Mo, W or Cr to the dissolved surface, and subjecting the material to heat treatment and rolling.
CONSTITUTION: The surface of a Pb-Ca alloy material is dissolved with a suitable etching soln., and one or more among Sn, Ag, Mo, W and Cr are stuck to the dissolved surface. The material is then subjected to heat treatment and rolling or other working. A corrosion resistant alloy is formed only at the surface part at high concn., and by the synergistic effect of the alloy and the preferential dissolution of metallic grain boundaries, an alloy material with improved corrosion resistance is obtd. When this alloy material is used as the material of the plate grid of a lead storage battery, the life of the battery can be prolonged.
FUKUNAGA HIDEMI
TAKAHASHI KATSUHIRO
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