Production of heavy pure aluminum coatings on small diameter tub

Details Production of heavy pure aluminum coatings on small diameter tub Production of heavy pure aluminum coatings on small diameter tub

1977-07-13

1979-05-22

Esposito, Michael F.

Metal deforming

With 'coating' of work

Metal coating

427320, 427329, 427431, 427434D, 427436, 427398R, B21C 3706, B05D 300, B05D 312, C23C 102

Patent

active

041552350

ABSTRACT:
A method, and an apparatus for practicing the method, for producing heavy pure aluminum coatings on small diameter steel tubing are disclosed. The coating has an average thickness of 0.004 inch to 0.008 inch (100-200 .mu.m), to provide outstanding resistance to corrosion, and to maintain integrity in the face of abrasive action, and with coating ductility and adherence sufficient to permit double flaring. The method and apparatus are highly useful in the manufacture of Bundyweld tubing for automotive brake lines, and single wall tubing for refrigeration or air conditioner heat exchangers. Various surface preparations are disclosed; and after surface preparation the tube is uniformly heated to a carefully regulated peak temperature in a non-oxidizing high intensity direct fired furnace, followed by passing the tube vertically upward through a shallow pool of molten aluminum, whereby to cast on a thick coating, followed by "free exit" finishing, air quenching, and, if desired, redrawing.

REFERENCES:
patent: 2570906 (1951-10-01), Alferieff
patent: 2926103 (1960-02-01), Brick
patent: 2935420 (1960-05-01), Linden
patent: 3010844 (1961-11-01), Klein et al.
patent: 3018194 (1962-01-01), Norman et al.
patent: 3457097 (1969-07-01), Yonezaki et al.
patent: 3468695 (1969-09-01), Federman
patent: 3526529 (1970-09-01), Pierson et al.
patent: 4053663 (1977-10-01), Caldwell et al.

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