Process for the manufacture of tinplate using a fused tin chlori

Details Process for the manufacture of tinplate using a fused tin chlori Process for the manufacture of tinplate using a fused tin chlori

1992-03-10

1995-04-04

Niebling, John

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Agitating or moving electrolyte during coating

205140, 205206, 205209, 205230, C25D 366, C25D 706

Patent

active

054034680

ABSTRACT:
A process for the manufacture of tinplates comprising electroplating a substrate in a fused-chloride tin plating bath at a temperature of about 150.degree. to 350.degree. C., a current density of about 100 to 500 A/dm.sup.2 in an atmosphere of a non-oxidizing gas. This process may be converted to a process for the manufacture of reflow type tinplates by only changing the bath temperature, and vice versa. For the manufacture of no-reflow type tinplates, the bath is kept at 150.degree. to 232.degree. C., while for the manufacture of reflow type tinplates, the bath is kept at 233.degree. to 350.degree. C. In these cases, the bath includes SnCl.sub.2 and at least one member selected from the group consisting of KCl, NaCl, LiCl and AlCl.sub.3, and may preferably be operated while flowing the bath at a flow rate of about 0.1 m/sec higher. There is provided equipment for the manufacture of tin-plated steel strip comprising a pretreating apparatus for cold rolling steel strip, an annealing apparatus, a skin pass rolling apparatus, a fused-salt tin-electroplating apparatus with the above bath including chlorides, and an aftertreating apparatus, these apparatus being continuously integrated into the equipment by use of a fused-salt bath.

REFERENCES:
patent: 4966659 (1990-10-01), Seto et al.

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