Electrolytic plating of steel substrate

Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Depositing predominantly single metal coating

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C25D 330

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active

059284870

ABSTRACT:
A new combination of steel strip electrolytic plating process steps which eliminate iron ion dissolution from continuous-strip steel substrate into chemically-corrosive plating solutions, such as Halogen-bath or methylsulphonic acid plating solutions, of horizontal passline electrolytic tin plating means which plate a single strip surface at a time. The previous use of a cyanide in Halogen-bath tin plating operations which formed a hazardous precipitant (prussian blue) is eliminated by eliminating iron ion dissolution from the steel strip substrate. And conversion of stannous ions to stannic ions, which formed additional Halogen-bath precipitant, is substantially eliminated. Also, new electrolytic plated product, with improved corrosion-prevention characteristics, is provided in which a flat-rolled steel substrate strike-coat of tin and/or nickel is plated simultaneously with electrolytic pickling of such cleansed substrate; pickle-plating is carried out prior to finish-surface electrolytic tin plating in such a horizontal passline electrolytic tin plating means.

REFERENCES:
patent: 3954571 (1976-05-01), Eppensteiner et al.
patent: 5378347 (1995-01-01), Thomson et al.
patent: 5451323 (1995-09-01), Akao et al.

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