| 摘要 |
PURPOSE:To increase the corrosion resistance of a zinc alloy used in a negative electrode and to decrease the amalgamation rate of negative zinc by utilizing a synergetic effect produced by the combination of added elements. CONSTITUTION:A zinc alloy containing 0.01-0.5 wt.% thallium, 0.01-0.5 wt.% bismuth and/or tellurium, and 0.01-O.2 wt.% aluminum is used as active material. Thallium has a high effect on increasing hydrogen overvoltage, is well alloyed with mercury at room temperature, and increases the hydrogen overvoltage on the surface of zinc. Bismuth retards the diffusion of mercury from the surface of amalgamated zinc to the inside through grain boundaries and retains high mercury concentration on the surface of zinc. Addition of aluminum increases the corrosion resistance of zinc. Therefore, a zinc alkaline battery whose amalgamation rate is low but practicality is high can be obtained. |
