| 摘要 |
852,931. Electroplating. MOND NICKEL CO. Ltd. Feb. 12, 1958 [Feb. 20, 1957], No. 4628/58. Class 41 In a nickel plating process using a halide-free plating bath an insoluble anode is used comprising a core of metal or alloy, preferably wrought nickel, and an electro deposited layer of nickel of low anode current efficiency produced by depositing from a bath free from organic impurities or additions capable of depositing sulphur. Alternative materials for the core are cast nickel, iron, copper, aluminium, zinc, tin, antimony, bismuth, or alloys, including nickel-copper, iron-nickel, copper-nickel, tinzinc, tin-bismuth, tin-lead, antimony-bismuth, bismuth-tin, and zinc-aluminium. The anode is preferably used with a sulphate or sulphamate bath which is substantially free from organic additives in addition to being halide-free, and which may be shaped for use, closely spaced from the cathodes, in the plating of pipes, tubes, rolls, strip or wire, and in the electroforming of complicated shapes. Examples describe the use (1) of a nickel bar anode, prelimarily cleaned, treated anodically in 25 % sulphuric acid, and then briefly treated cathodically, for internally nickel-plating the interior of a pipe in an allsulphate bath containing boric acid, and (2), of a similar bar for plating a pair of nickel sheets. |
