| 摘要 |
637,154. Electrodeposition of metals. VANDERVELL PRODUCTS, Ltd., GREEN, D. F., SALMON, J. E., and MALLET, N. P. March 19, 1945, No. 6895. [Class 41] [Also in Group XXXIV] A bearing consists of a steel backing with an electrodeposited layer of soft bearing metal 0.0005 to 0.01 inch thick applied direct to the backing or with only a very thin bonding layer. The soft bearing metal may be an alloy of indium with tin, zinc, lead or copper or with lead and tin, or an alloy of lead, tin and antimony; the constituents may be codeposited or deposited in succession and afterwards interdiffused. A steel shell is prepared for electrodeposition by degreasing followed by immersion in an aqueous solution of mineral acids, e.g. a mixture of nitric and hydrochloric acids. For depositing a zinc-indium alloy the bath may contain indium cyanide, zinc cyanide and a saccharide such as dextrose and is stabilized with an alkali metal hydroxide. For depositing a tin-indium alloy, a similar bath in which zinc cyanide is replaced by potassium stannate is employed. Proportions are given for depositing a zinc-indium alloy containing 20 per cent indium, an indium-zinc alloy containing 25 per cent zinc, a tin-indium alloy containing 7 per cent indium and an indiumtin alloy containing 20 per cent tin. Specifications 566,538, 573,848, 577,335, 628,459, 637,153 and 637,159 are referred to. Reference has been directed by the Comptroller to Specification 572,105. |
