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US 5,510,010 AGranted
Copper article with protective coating
AssigneeCarrier Corporation
InventorRichard G. Kobor
Life of this patent
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Abstract
A copper heat exchanger unit for operating in a harsh environment wherein the exposed surfaces of the unit are first provided with a black oxide layer and then electrocoated with a protective acrylic barrier.
Claims5
A method of protecting a copper heat exchanger against corrosion that includes the steps of:
- providing a copper heat exchanger which contains a plurality of spaced apart fins,
- precleaning and degreasing exposed surfaces of said heat exchanger followed by immersing the heat exchanger in an acid bath to remove unwanted oxides from the exposed surfaces, and then washing the heat exchanger with water,
- immersing the heat exchanger in an aqueous oxidizing bath for a period of time sufficient to establish a uniform black oxide covering exposed surfaces of the heat exchanger,
- rinsing said heat exchanger after the oxidizing step in successive baths of cold water, hot water, and deionized water, and
- electrocoating said oxidized surfaces with a non-conductive acrylic paint to provide a continuous protective barrier over said exposed surfaces against corrosion.
2 more elements
Dependencies are inferred from the claim text.