Heat exchanger
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United States of America Patent
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Feb 28, 2017
Grant Date -
Jul 30, 2015
app pub date -
Jan 28, 2015
filing date -
Jan 29, 2014
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Heat exchange tubes of a heat exchanger are formed of an alloy containing Mn (0.2 to 0.3 mass %), Cu (0.1 mass % or less), and Fe (0.2 mass % or less), the balance being Al and unavoidable impurities. A Zn diffused layer is formed in an outer surface layer portion of the peripheral wall of each heat exchange tube. T≦200, 0.57≦A≦1.5, D/T≦0.55, and 0.0055≦A/D≦0.025 are satisfied, where T is the thickness [μm] of the peripheral wall of the heat exchange tube, A is the Zn concentration [mass %] at the outermost surface of the outer surface layer portion, and D is the maximum depth [μm] of the Zn diffused layer. The spontaneous potential of the Zn diffused layer is lower than that of a portion of the peripheral wall located on the inner side of the Zn diffused layer.
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International Classification(s)
- F28D:HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTH....
- F28F:DETAILS OF HEAT-EXCHANGE OR HEAT-TRANSFER APPARATU....
- B22F:WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES F....
- C21C:PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE....
- C22C:ALLOYS
- B32B:LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA....
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