HEAT EXCHANGER AND METHOD OF MANUFACTURING THE SAME
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United States of America Patent
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May 13, 2016
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Jun 2, 2015
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Abstract
The wall of each heat exchange tube of a condenser for a car air conditioner is composed of a core material layer, a first brazing material layer covering the outer surface of the core material layer, and a second brazing material layer covering the inner surface of the core material layer. A Zn diffused layer is formed in an outer surface layer portion of the core material layer. The deepest portion of the Zn diffused layer is located at a position 70 to 100 μm deep from an outermost surface of the wall. The Zn concentration of the outermost surface of the wall of the heat exchange tube is 0.55 mass % or higher. The Zn diffused layer includes a high potential portion whose spontaneous potential is at least 41 mV higher than the spontaneous potential at the boundary between the core material layer and the first brazing material layer.
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