Preparing metal for melt-coating

Details Preparing metal for melt-coating Preparing metal for melt-coating

1990-01-04

1991-10-01

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

204 34, 204 561, 427329, 427406, 427418, 427433, 427444, C25D 500

Patent

active

050531123

ABSTRACT:
Steel is prepared for hot-dip coating in molten zinc, by forming lead chloride on it in a greater mass (at least 12 g/m.sup.2) than possible by evaporation from saturated aqueous solution. One way of so forming the lead chloride is to cathodize the steel (24000 coulomb/m.sup.2) in 1:1 HCl saturated with lead chloride, and air-dry the steel. The steel thus prepared is dipped for 2 minutes in molten zinc or, for greater corrosion resistance, in molten scrap zinc.

REFERENCES:
patent: 4081005 (1978-03-01), Gray et al.
patent: 4152471 (1979-05-01), Schnedler et al.
patent: 4505958 (1985-03-01), Lieber et al.
Chemical Abstracts, vol. 74, No. 14, Apr. 5, 1971, p. 517, Abstract No. 70957u.
English Language Abstract WPI Acc No. 83-31513K/13 of SU 929374A (1982).

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