The invention relates to
brazing aluminum steel and a cesium and
rubidium containing
brazing flux thereof and belongs to the field of
brazing materials in non-
metal materials. The brazing flux comprises, by a
mole ratio, 0.01 mol to 0.56 mol of
rubidium fluoride (RbF), 0.15 mol to 0.58 mol of cesium
fluoride (CsF), 0.001 mol to 0.25 mol of aluminum
oxide (Al2O3), 0.001 mol to 0.2 mol of
potassium fluoride (KF), 0.002 mol to 0.05 mol of
gallium fluoride (GaF3), 0.001 mol to 0.025 mol of
lithium fluoride (LiF), 0.001 mol to 0.025 mol of
boron fluoride (BF3), and the balance
aluminum fluoride (AlF3). According to the brazing aluminum steel and a cesium and
rubidium containing brazing flux thereof, brazing technical requirements of aluminum to aluminum, aluminum to
copper, and aluminum to steel can be simultaneously met, and the high-activity novel
soldering flux is achieved.