Coating processes – Centrifugal force utilized – Metal coating
Patent
1991-06-12
1992-12-22
Bell, Janyce
Coating processes
Centrifugal force utilized
Metal coating
427295, 427377, 4273984, 427432, 427433, B05D 312
Patent
active
051733340
ABSTRACT:
Apparatus and method for improving the metal coating on metal parts immersed in a molten metal coating bath of a different composition. The apparatus comprises (a) a vacuum pump, (b) a buffer tank, (c) centrifuge having a drum, a cover for sealing the drum, a platform within the drum to receive the parts and means to spin the platform, and (d) valved lines connecting with the drum cover and connecting, respectively, with the buffer tank a source of gas at atmospheric pressure and a source of gas at greater than atmospheric pressure. The tank has a volume of at least 10 times the volume of the drum.
The method comprises the steps of (1) transferring the molten metal coated metal parts from a molten metal coating bath to a centrifuge drum, (2) sealing the drum and creating a partial vacuum therein, (3) rapidly spinning the molten metal coated parts to permit excess molten coating metal to drain from the parts and cool the molten coating metal adhering thereto, (4) introducing a first gas at atmospheric pressure to the drum and spinning the parts at a reduced rate to permit the metal coating to cool below its liquidus temperature and solidify on the parts, and (5) introducing a second gas at a pressure greater than atmospheric pressure to the drum and further reducing the spinning thereof to permit the metal coating on the parts to further cool below 250.degree. C.
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Bell Janyce
O'Keefe Joseph
Wilkinson Charles A.
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