Verfahren zur Herstellung einer Eisenschicht

摘要

753,455. Electrolytic production of iron sheets. BRITISH THOMSON-HOUSTON CO., Ltd. Aug. 26, 1953 [Sept. 15, 1952], No. 23107/52. Class 41. A process of producing a sheet of iron consists in preparing a sheet of metallic substrate material of cubic structure having the majority of its crystals aligned so that two adjacent cube edges lie substantially in the plane of the sheet, electrolytically depositing iron on the substrate using an electrolyte of ferrous chloride at a temperature of not less than 50‹ C. and a current density of 1 amp/dm2 until a coating of at least 0.002 inches has been obtained, and separating the coating from the substrate. A substrate of gold may be used, which is first cold rolled and then annealed at 1000‹ C. for one hour. Substrates of copper, iron, nickel, aluminium, or a nickel-iron alloy containing 50 per cent nickel, may also be used. The iron may be deposited from 600 gms. of FeCl2.4H 2 O per litre of water at a pH of 1.8 and at 70‹ C. The iron sheet obtained in this way may be used as a " master " for producing further sheets by first electrodepositing silver or tin on the " master" (90 gms. Na 2 SnO3. 3H 2 O and 7.5 gms. NaOH in 1 litre of water at cathode current density of 0.1 amps/dm2 and at 70‹ C., with tin anodes, may be used), iron then being electrodeposited on the coating as before. The so-deposited iron sheet is then removed, e.g. by melting the intermediate metal, or in the case of tin, by exposing the sheet to chlorine.