Zinc-aluminum alloy coating resistant to inter-granular...

Details Zinc-aluminum alloy coating resistant to inter-granular... Zinc-aluminum alloy coating resistant to inter-granular...

C - Chemistry, Metallurgy

23

C

117/118, 117/231

C23C 2/06 (2006.01)

Patent

CA 1064782

ABSTRACT OF THE DISCLOSURE A ferrous metal strip is continuously hot-dip coated with a zinc-aluminum alloy by immersing the metal strip in a hot-dip coating bath containing between about 0.2 wt. percent and 17 wt. percent aluminum, between about 0.02 wt. percent and 0.15 wt. percent magnesium with the balance essentially zinc. In a further embodiment the hot-dip alloy coating can also contain between about 0.1 wt. % and 0.3 wt. % copper. The resulting hot-dip zinc-aluminum alloy coatings when applied to a ferrous metal strip exhibit good resistance to inter- granular corrosion and blistering when exposed to a high humidity atmosphere and form smooth surface coatings which have good formability both in the "as coated" state and after prolonged storage in a high humidity atmosphere.

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