One kind of solder soldering aluminum and aluminum alloy and a method for preparing

The present invention relates to a method for preparing solder and aluminum and aluminum alloy soldering, flux comprises two parts of the solder alloy and the inner core composition of the outer layer, flux in the solder wire as pourable solder feed components and weight percentage of the core wire, an outer layer composed of a solder alloy is: 84 to 92% tin, 7 to 13% zinc, bismuth, 0 to 3%. The present invention is aluminum or an aluminum alloy, zinc as zinc-bismuth alloy brazing aluminum, during brazing, the brazing alloy of zinc and aluminum react with aluminum in the brazing process, forming a layer of brazing material at the interface with the aluminum aluminum zinc solid solution, the electrode potential between the ease with aluminum solder difference, to improve the corrosion resistance of the brazed joint, the brazing material due to higher amounts of zinc, zinc alloy, soldered joints so than copper alloys better corrosion resistance.