C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/22, 204/25.5
C25D 5/12 (2006.01) C23C 22/24 (2006.01) C23C 22/30 (2006.01) C23C 22/33 (2006.01) C23C 22/37 (2006.01) C25D 3/30 (2006.01) C25D 5/26 (2006.01) C25D 5/48 (2006.01) C25D 11/38 (2006.01)
Patent
CA 1179628
ABSTRACT OF THE DISCLOSURE The disclosure describes a process for producing a steel sheet having a lower layer of tin and an upper layer of hydrated chromium oxide having excellent weldability. The process comprises electrolytically tin plating a substantially clean steel sheet in an electrolyte containing stannous sul- fate, stannous phenolsulfonate, stannous chloride, stannous fluoborate, sodium stannate or potassium stannate, to obtain a tin plated steel sheet having an amount of plated tin of 0.05 - 1.12 g/m2. Then the resultant steel is immersed in a solution containing hexavalent chromium ions, or hexavalent chromium ions and at least one member selected from the group consisting of a trivalent chromium compound, a sulfur compound, a fluorine compound and a phosphorus compound to form an upper layer consisting essentially of hydrated chromium oxide in an amount of 0.5 - 5 mg/m2, calculated as chromium. This steel sheet also has excellent lacquer adhesion and corrosion resist- ance after lacquering and forming.
372719
Inui Tsuneo
Kuroda Hitoshi
Nakagawa Yasuhiko
Onoda Ichiro
Swabey Ogilvy Renault
Toyo Kohan Co. Ltd.
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