Coating processes – With pretreatment of the base – Etching – swelling – or dissolving out part of the base
Patent
1991-07-16
1992-12-29
Beck, Shrive
Coating processes
With pretreatment of the base
Etching, swelling, or dissolving out part of the base
427320, 427329, 427432, 4274342, 427436, B05D 314, B05D 118
Patent
active
051750260
ABSTRACT:
A method of pretreating and hot-dip coating aluminum or aluminum alloys on a chromium-containing steel strip to provide an improved coating comprising annealing final gauge steel strip in an oxygen excess atmosphere to produce a chromium-rich oxide on the surface and thereafter electrolytically descaling the strip in an aqueous salt solution to remove the oxide and to expose a chromium depleted surface of the strip. The strip is then transported to a coating line where it is heated to a temperature at or above the temperature of a bath of aluminum or aluminum alloy. A substantially hydrogen atmosphere is maintained over the bath while the dew point is maintained below minus 35.degree. C. The strip is then drawn through the bath to coat the strip.
REFERENCES:
patent: 4415415 (1983-11-01), Zaremski
patent: 4675214 (1987-06-01), Kilbane et al.
patent: 4883723 (1989-11-01), Kilbane et al.
patent: 5023113 (1991-06-01), Boston et al.
Bertol William A.
Hayashi Yoshio
Hill James B.
Otani Eisuke
Zaremski Donald R.
Allegheny Ludlum Corporation
Bareford Katherine A.
Beck Shrive
Wheeling-Nisshin, Inc.
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