US 12,139,639 B2
Aluminum heat exchanger
Mark R. Jaworowski, Glastonbury, CT (US); Mary Teresa Lombardo, Windsor, CT (US); Michael F. Taras, Fayetteville, NY (US); Mel Woldesemayat, Liverpool, NY (US); Stephanie Bealing, West Hartford, CT (US); and Matthew Patterson, East Syracuse, NY (US)
Assigned to CARRIER CORPORATION, Palm Beach Gardens, FL (US)
Appl. No. 14/771,740
Filed by Carrier Corporation, Farmington, CT (US)
PCT Filed Feb. 28, 2014, PCT No. PCT/US2014/019485
§ 371(c)(1), (2) Date Aug. 31, 2015,
PCT Pub. No. WO2014/134479, PCT Pub. Date Sep. 4, 2014.
Claims priority of provisional application 61/771,527, filed on Mar. 1, 2013.
Prior Publication US 2016/0014929 A1, Jan. 14, 2016
Int. Cl. F28D 1/04 (2006.01); B23P 15/26 (2006.01); C09D 5/08 (2006.01); C09D 7/61 (2018.01); C23C 22/34 (2006.01); C23C 22/36 (2006.01); F28F 19/02 (2006.01); F28F 21/08 (2006.01); H05K 7/20 (2006.01); F28F 19/06 (2006.01)
CPC C09D 7/61 (2018.01) [B23P 15/26 (2013.01); C09D 5/084 (2013.01); C23C 22/34 (2013.01); C23C 22/361 (2013.01); F28F 19/02 (2013.01); F28F 21/084 (2013.01); H05K 7/20254 (2013.01); C23C 2222/10 (2013.01); F28F 19/06 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A heat transfer system comprising a heat transfer fluid circulation loop and a heat exchanger comprising an aluminum alloy disposed in the heat transfer fluid circulation loop, wherein the heat exchanger is a round tube plate fin heat exchanger; and wherein said heat exchanger has a top surface of a mixed-metal oxide permanently integrated with the aluminum alloy on at least a portion of the heat exchanger, said mixed metal oxide top surface derived from a composition comprising a trivalent chromium salt and an alkali metal hexafluorozirconate in an aqueous solution; where the trivalent chromium salt comprises (NH)4Cr(SO4)2, KCr(SO4)2 and mixtures comprising any of the foregoing; wherein the heat exchanger comprises a first aluminum alloy component connected by brazing to a second aluminum alloy component and wherein the mixed metal oxide top surface is disposed over the first aluminum alloy component, the second aluminum alloy component, return bend tube portions, and the brazing connecting the first and second aluminum alloy components; and wherein the brazing comprises zinc.