C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/21.7
C25D 3/30 (2006.01) C25D 11/38 (2006.01)
Patent
CA 1102272
ABSTRACT OF THE DISCLOSURE The invention is concerned with a steel sheet useful in forming foodstuff and beverage cans, which compri- ses a steel sheet base, a first layer of substantially uniform thickness containing an iron-tin alloy and a second layer of substantially uniform thickness consisting essen- tially of hydrated chromium oxide, the first layer being disposed between the base and the second layer. The inven- tion also relates to a process for producing the above steel sheet, which comprises electrolytically tin plating a substantially clean steel sheet base in a tin-containing electrolyte to obtain a tin-plated steel sheet in which the amount of plated tin is 0.05-1.5 g/m2; heating the tin- plated steel sheet at a temperature so as to form a first layer containing an iron tin alloy on the surface of the base, the amount of the iron-tin alloy being 0.05-1.0 g/m2, calculated as tin, the amount of any free tin in the first layer being less than one-third of the total amount of the plated tin, and subjecting the resultant steel sheet to an electrolytic treatment at 8-140 coulombs/dm2 in an electrolyte containing sodium dichromate, or at 5-20 coulombs/dm2 in an electrolyte containing chromic acid and at least one additive selected from the group consisting of sulfuric acid, a fluorine compound, an aromatic disulfonic acid and thiourea, to form a second layer consisting essen- tially of hydrated chromium oxide in an amount of 0.005- 0.05 g/m2, calculated as chromium, any metallic chromium deposited between the first and second layers being present in an amount less than 0.005 g/m2. The steel sheet of the invention can be effectively coated with an organic coating.
285153
Inui Tsuneo
Kawamura Hiroaki
Tsutsui Nobuyuki
Swabey Ogilvy Renault
Toyo Kohan Co. Ltd.
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