Flux for aluminum steel brazing

Abstract

The invention belongs to the field of brazing material of non-metallic material and discloses soldering flux suitable for aluminum steel brazing. The soldering flux is characterized by being composed of, by weight, 0.001-0.01% of rubidium fluoride (RbF), 11.0-45.0% of cesium fluoride (CsF), 0.01-2.0% of aluminum oxide (Al2O3), 0.01-5.0% of potassium fluoride (KF), 0.001-0.04% of zinc fluoride (ZnF2) and the balance aluminum fluoride (AlF3). The soldering flux can meet the brazing requirements of aluminum-steel, aluminum-copper and aluminum-aluminum and is high in activity.

Description

technical field [0001] The invention belongs to the field of brazing materials of non-metallic materials, and in particular relates to a cesium-rubidium brazing flux containing zinc fluoride active agent which can braze aluminum-steel, aluminum-copper and aluminum-aluminum. Background technique [0002] With the rapid development of aerospace, automobile, rail transit, home appliances and other industries, a large number of aluminum-aluminum structures are used. At the same time, there are more and more applications for the composite structure of copper and aluminum alloy, steel and aluminum alloy. The structure of aluminum-copper and aluminum-steel metal composite materials has been widely used in rail transit, automobiles, home appliances and other fields. application. However, there are still many unsolved problems in the welding "connection" of aluminum-steel and aluminum-copper dissimilar metal materials. [0003] The applicant has searched the literature, and in the ...

AI Technical Summary

Problems solved by technology

Although this invention can simultaneously meet the brazing requirements of "aluminum-copper", "aluminum-steel" and "aluminum-aluminum" and has high activity, its content of rubidium fluoride (RbF) is as high as 0.12 mole to 0.5 mole, and the price Expensive, unable to meet the highly competitive manufacturing industry's need for "high quality and low price" consumable materials

[0005] Studies have shown that the oxides on the surface of aluminum alloys are mainly Al 2 o 3 , MgO, MnO, CuO, SiO 2 etc., the oxides on the steel surface are mainly FeO, Fe 2 o 3 , NiO, Cr 2 o 3 etc., the oxides on the surface of copper alloy are mainly CuO, Cu 2 O, ZnO, etc., it is very difficult to remove the oxides on the surface of aluminum alloy, steel and copper alloy at the same time with only one flux

The literature shows that the CsAlF developed in recent years 4 , KCsAlF 4 and CsF-RbF-AlF 3 Flux can remove the oxides on the surface of aluminum alloy and copper alloy very well at the same time, thus solving the brazing problem of aluminum-copper dissimilar materials, but the effect of simultaneously removing the oxides on the surface of aluminum alloy and steel (or stainless steel) is still Not ideal; CN201310445105.3 recommends "a new type of flux for brazing stainless steel and aluminum" that can solve the brazing of aluminum-steel dissimilar materials, but cannot braze aluminum-copper dissimilar materials; CN201410076059.9 discloses a A kind of "cesium-rubidium-containing flux that can braze aluminum steel and aluminum-copper", but its formula is too complicated, and quality control is very difficult during production; CN201410752345.2 discloses a cesium-rubidium flux containing gallium oxide. The content of rubidium (RbF) is as high as 0.12 mole to 0.5 mole, which is expensive, and the cost is too high when used in large quantities

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