C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 2/02 (2006.01) C23C 2/12 (2006.01) C25F 1/06 (2006.01)
Patent
CA 2073258
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 excess oxygen 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°C. The strip is then drawn through the bath to coat the strip.
Bertol William Arthur
Hayashi Yoshio
Hill James Byron
Otani Eisuke
Zaremski Donald Raymond
Allegheny Ludlum Corporation
Sim & Mcburney
Wheeling-Nisshin Inc.
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