| 摘要 |
PURPOSE:To restrain the occurrence of hydrogen gas at the process of applying a non-porous and unleaded system, and improve the resistance of a mercury-less alkaline battery against liquid leakage by using zinc with an extremely small content of iron as an impurity, and adding the predetermined additional element thereto. CONSTITUTION:Each additional element represented by the following (1) or (2) is dissolved in the hot melt of zinc containing 1ppm or less of iron as an associated impurity to obtain the content thereof within the prescribed range; (1) 0.001 to 0.5wt.% of aluminum, 0.001 to 0.5wt.% of bismuth and 0.001 to 0.5wt.% of at least one element selected from tin, manganese, potassium and magnesium, and (2) 0.5wt.% or less of indium added to the elements expressed by (1). The product so obtained is pulverized by the atomizing method and further sieved. Zinc alloy powder is thereby obtained. This powder can restrain the occurrence of hydrogen gas at level equal to or lower than the allowable upper limit of leakage liquid resistance. |
