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US 2008/0257533 A1Published application
Method of Producing a Corrosion Resistant Aluminum Heat Exchanger
AssigneeLuvata Franklin, Inc.
InventorEdward G. Rottmann
Life of this patent
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Abstract
An aluminum heat exchanger having increased resistance to galvanic corrosion. The exterior of one end of the aluminum tube or connector is coated with a metal or metal alloy. This end is brazed onto a copper or copper alloy inlet or outlet tube. The metal or metal alloy coating inhibits the formation of galvanic corrosion.
Claims23
An aluminum-copper heat exchanger, comprising:
- at least one copper tube;
- at least one aluminum connector having an exterior, an interior, a first end, and a second end, wherein the exterior of said aluminum connector is at least partially coated on the first end, wherein the second end of the at least one aluminum connector is brazed to the heat exchanger;
- wherein the coated end of the at least one aluminum connector is brazed to the copper tube at a brazing temperature;
- and,
- wherein the first end of the aluminum connector is coated with a metal having a higher solidus temperature than the brazing temperature used to braze the aluminum connector to the copper tube.
2 more elements
A method of forming a corrosion resistant aluminum-copper heat exchanger, the method comprising:
- providing at least one aluminum tube for conveying a pressurized fluid;
- providing at least one aluminum connector, having an exterior and an interior;
- at least partially coating one end of the exterior of the at least one aluminum connector;
- providing a cladding material for brazing the aluminum tube to the aluminum connector;
- brazing the aluminum tube to the uncoated end of the aluminum connector in a controlled atmosphere brazing oven;
- providing at least one copper tube;
- providing a cladding material for brazing the at least partially coated end of the aluminum connector to the copper tube;
- brazing the partially coated end of the aluminum connector to the copper inlet tube or copper outlet tube;
- and,
- wherein the coated end of the aluminum connector is coated with a metal having a higher solidus temperature than the brazing temperature used to braze the aluminum connector to the copper tube.
7 more elements
An aluminum-copper heat exchanger, comprising:
- at least one copper tube;
- at least one aluminum tube having an exterior, an interior, a first end, and a second end, wherein the exterior of said aluminum tube is at least partially coated on the first end, wherein the second end of the at least one aluminum tube is brazed to the heat exchanger;
- wherein the coated end of the at least one aluminum tube is brazed to the copper tube at a brazing temperature;
- and,
- wherein the first end of the aluminum tube is coated with a metal having a higher solidus temperature than the brazing temperature used to braze the aluminum tube to the copper tube.
2 more elements
Dependencies are inferred from the claim text.