Coating processes – Immersion or partial immersion – Molten metal or fused salt bath
Patent
1977-04-18
1978-12-05
Kendall, Ralph S.
Coating processes
Immersion or partial immersion
Molten metal or fused salt bath
428659, 75178A, 75178AM, 427321, 427349, C23C 102
Patent
active
041286766
ABSTRACT:
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 lead, and between about 0.03 wt. percent and about 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 intergranular 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.
REFERENCES:
patent: 2824021 (1958-02-01), Cook et al.
patent: 3056694 (1962-10-01), Mehler et al.
patent: 3245765 (1966-04-01), Lawson
patent: 3320040 (1967-05-01), Roe
patent: 3505043 (1970-04-01), Lee et al.
Inland Steel Company
Kendall Ralph S.
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