Process of making long-life thin metal plate for automobile bodi

Details Process of making long-life thin metal plate for automobile bodi Process of making long-life thin metal plate for automobile bodi

1982-03-01

1985-01-22

O'Keefe, Veronica

Metal treatment

Compositions

Heat treating

428623, 428629, 428632, 428633, 428658, 428659, 428666, 428667, 427406, 4274192, 427433, 428622, C23F 726

Patent

active

044950080

ABSTRACT:
Thin metal plate is cleaned and electrolytically pickled in an acid solution. A zinc layer is electrodeposited on one face of the plate, after which a chrome-chromic oxide coating is deposited on both faces of the plate from a sulphuric acid solution containing compounds of trivalent and exhavalent chrome. The plate is then subjected to a drying-oxidating treatment in air. The plate may be steel having a thickness between 0.1 and 2 mm. The plate may be surface treated by phosphating, and then painted. The chrome-chromic oxide coating may have a thickness between 0.05 and 5 .mu.m, and the zinc coating a thickness between 1 and 30 .mu.m.

REFERENCES:
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patent: 3816082 (1974-06-01), Austin et al.
patent: 3827866 (1974-08-01), Uchida et al.
patent: 4047977 (1977-09-01), Yoshida et al.
patent: 4048381 (1977-09-01), Adaniya et al.
patent: 4101345 (1978-07-01), Hunter et al.
patent: 4171392 (1979-10-01), Sievert et al.
patent: 4216250 (1980-08-01), Nakayama et al.
Lowenheim, F. A.; Electroplating, McGraw Hill, New York, pp. 86-87, 442-446, 449-451, (1978).
Lyman, T., ed.; Uretals Handbook 8th edition, vol. 2, p. 547, (1964).

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