Brazing pre-flux coating with improved corrosion performance
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United States of America Patent
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Nov 14, 2017
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Sep 6, 2012
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Sep 22, 2011
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Abstract
A pre-flux coating for the manufacturing of heat exchanger components of aluminum, wherein the coating comprises a combination of fluxes in the form of potassium aluminum fluoride K1-3AlF4-6, potassium trifluoro zincate, KZnF3, lithium aluminum fluoride Li3AlF6, a filler material in the form of metallic Si particles, Al—Si particles and/or potassium fluoro silicate K2SiF6, an additive in the form of aluminum oxide and at least one other oxide selected from the group consisting of zinc oxide, titanium oxide and cerium oxide forming a post braze ceramic layer, and a solvent and a binder containing at least 10% by weight of a synthetic resin which is based, as its main constituent, on a methacrylate homopolymer or a methacrylate copolymer.
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