| 摘要 |
1487916 Nickel hydroxide coatings INCO EUROPE Ltd 23 Oct 1974 [13 Nov 1973] 52658/73 Heading C7B [Also in Division H1] A metal foil or sheet e.g. of nickel is activated for use as an electrode in an alkaline accumulator by anodic treatment at a c.d. of 0À1-1000MA/cm<SP>2</SP> in an ammonia-containing Ni/NH4 nitrate solution in which the ratio of NH 3 :Ni (g.mol:g.ion) and the molar ratio of Ni(NO 3 ) 2 to NH 4 NO 3 are both in the range 0À1-3À0:1, followed by cathodic treatment in a Ni-containing acidic (e.g. pH 0À5 to below 7) electrolyte containing reducible ions of which the redox potential is more positive than the discharge potential of Ni. The reducible ions may be No 3 , CrO 4 , ClO 4 or MnO 4 for NO 3 the c.d. may be 0À1-100mA/cm<SP>2</SP> with an NO 3 concentration of 0À1M to saturation. The anodic treatment deposits black beta Ni hydrate; the cathodic treatment yields green Ni(OH)2 which impregnates the porous deposit of the former. |
