Patent ID: 7722922
Filing Date: 2010-05-25
Classification: B22F,B23K,C23C,F28F

Abstract:
1. A method of producing a resin-coated aluminum alloy flat multi-cavity tube for a heat exchanger comprising: adjusting the surface roughness of an aluminum alloy flat multi-cavity tube so that at least one flat surface of the aluminum alloy flat multi-cavity tube has a surface roughness of a center line average roughness (Ra) of 0.4 μm or more, and a ten-point height of irregularities (Rz) of 3 μm or more, supplying, by a top-feed system, a resin coating containing a metal powder for brazing, the metal powder containing a brazing flux, an acrylic resin, and a cross-linking agent with a metal powder volume content in solid content of 50% to 90%, and prepared together with water and an organic solvent; applying said resin coating by a reverse system to said roughened surface of said aluminium alloy flat multi-cavity tube; and drying.