| 摘要 |
PURPOSE:To restrain the nickel corrosion during the impregnation procedure of active materials, so as to prevent the decrease of mechanical strength of the pole plates and to make, free of occurrence, variation or decrease of the utility factor of active materials, by producing passive membrane composed of very thin oxide layers uniformly on the surface of sintered nickel plates. CONSTITUTION:Nickel powder is kneaded with organic water-soluble macromolecule and water to produce nickel slurry, and after the slurry is applied to porous electro- collectors and dried, the nickel powder is sintered in an atmosphere containing more than ten times equivalent weight of water vapor for carbon content contained in the nickel to produce sintered nickel plates. Further, the sintered nickel plates are heat-treated in an atmosphere containing oxygen at 160-300 deg.C, and the passive membrane composed of nickel oxide layers is produced on the surface of the sintered nickel plates. By this, passive membrane composed of very thin uniform oxide layers can be produced on the surface of the sintered nickel plates, and so the nickel corrosion during the impregnation procedure of active materials can be restrained, and thus the decrease of mechanical strength of pole plates can be prevented, and the pole plates having no or little decrease of utility factor of active materials can be obtained. |
