Atmospheric gas practice for hot-dip coating of metals

Details Atmospheric gas practice for hot-dip coating of metals Atmospheric gas practice for hot-dip coating of metals

1983-10-28

1984-08-21

Silverberg, Sam

Coating processes

With pretreatment of the base

Metal base

427432, 427433, B05D 118

Patent

active

044669992

ABSTRACT:
In the hot-dip coating utilizing molten metals in which the partial pressure of the metal vapor is substantial at the coating temperature, the resultant metal vapor in the snout area over the metal bath tends to cause pinhole type imperfections on the resultant coating. For example, substantial vaporization occurs during high temperature galvanizing and during hot-dip coating of Al-Zn, in which Al is a major constituent, such that the bath must be maintained at a high enough temperature to keep the aluminum molten. The accumulation of such vapors inside the snout area is minimized by (i) utilizing baffles within the snout to isolate it as much as possible from the cooling section of the annealing furnace, and (ii) venting a portion of the gas from the snout.

REFERENCES:
patent: 4053663 (1977-10-01), Caldwell
patent: 4148946 (1979-04-01), Byrd

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