Electrolytically tin-plating steel, remelting and alkaline...

Details Electrolytically tin-plating steel, remelting and alkaline... Electrolytically tin-plating steel, remelting and alkaline...

C - Chemistry, Metallurgy

25

D

204/21.6

C25D 5/48 (2006.01) C25D 5/50 (2006.01) C25D 11/00 (2006.01) C25D 11/38 (2006.01)

Patent

CA 1138373

ABSTRACT OF THE DISCLOSURE An electrolytic tin-plated steel sheet excellent in long-term paint adhesion and a process for manufacturing same, in which a steel sheet is subjected to an electrolytic tin plating treatment to form a tin plating layer thereon, then the resultant tin plating layer is subjected to a remelting treatment to produce noncrystallized tin oxides on the plating layer. The resultant noncrystallized tin oxides are subjected to a cathodic electrolytic treatment to eliminate, by reduction, tin oxides which crystallize into tetragonal .alpha.-Sno and tetragonal SnO2 on heating at the time of painting and baking so as to leave only a tin oxide which crystallizes into orthorhombic SnO on heating at the time of painting and baking in an amount within the range of from 1.0 to 6.5 millicoulomb/cm2.

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