Hot dip plating method and apparatus

Details Hot dip plating method and apparatus Hot dip plating method and apparatus

1998-07-10

2000-11-07

Bareford, Katherine A.

Coating processes

With pretreatment of the base

Fluxing

427329, 427431, 427436, B05D 118

Patent

active

061433640

ABSTRACT:
A batchwise hot dip plating method is performed by dipping a metallic material in a molten metal plating bath, following fluxing by dipping the metallic material in a bath of a fused salt flux (e.g., a mixture of cryolite and one or more alkali metal chlorides and optionally aluminum fluoride) having a melting temperature at least 5.degree. C. higher than the temperature of the molten metal plating bath, which also serves to preheat the metallic material. In the case of hot dip plating with an Al--Zn alloy, particularly a Zn/55% Al/0.5-2% Si alloy, a bare spot-free plated coating having good appearance can be formed by a reduced duration of dipping in the plating bath without post-plating treatment to remove flux residues. The use of a plating tank having a cross section of a round shape such as a semicircular shape or an oblong semielliptic shape, rather than a rectangular box shape, brings about a significantly extended service life of the plating tank.

REFERENCES:
patent: 3027268 (1962-03-01), Linden
Abstract of Japan 4-323356, Nov. 1992.

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