Method for pretreatment in the production of tin-free steel

Details Method for pretreatment in the production of tin-free steel Method for pretreatment in the production of tin-free steel

1978-06-22

1979-06-12

Williams, Howard S.

Chemistry: electrical and wave energy

Processes and products

204 29, C25D 512, C25D 536

Patent

active

041579445

ABSTRACT:
A method for the pretreatment of tin-free steel which comprises a cathodic treatment after an anodic treatment of a degreased steel sheet in an acid chromate electrolyte, said steel sheet consisting of an upper layer of hydrated chromium oxide and a lower layer of metallic chromium. This pretreated tin-free steel has excellent lacquer adhesion after aging in hot water and under retort conditions.

REFERENCES:
patent: 3904491 (1975-09-01), Smith
patent: 3928157 (1975-12-01), Suematsu et al.

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