C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/25.5
C25D 3/30 (2006.01) C25D 11/38 (2006.01)
Patent
CA 1094010
Abstract of the Disclosure The disclosure teaches a thin tin-plated steel sheet which includes a first layer of substantially uniform thickness of tin in an amount of 0.05 - 0.60 gram per square meter of the total surface area of the base, and a second layer of substantially uniform thickness consisting essentially of hydrated chromium oxide in an amount of 0.005 - 0.05 g/m2 calculated as chromium. The first layer is disposed between the base and the second layer over substantially the entire total surface area of the base. Any metallic chromium deposited between the first and second layers is present in an amount of less than 0.005 g/m2. A process for produc- ing the sheet includes the steps of electrolytically tin plating a substantially clean steel sheet base in an electrolyte containing stannous sulfate, stannous chloride, stannous fluo- borate, sodium stannate or potassium stannate and then treating the plated sheet in an electrolyte containing chromic acid and one of sulphuric acid, a fluorene compound, an aromatic dis- ulfonic acid or thiourea.
284471
Inui Tsuneo
Kawamura Hiroaki
Tsutsui Nobuyuki
Swabey Ogilvy Renault
Toyo Kohan Co. Ltd.
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