Brazing flux suitable for brazing aluminium and steel

Abstract

The invention relates to a brazing flux suitable for brazing aluminium and steel, and belongs to the field of non-metallic brazing materials. The brazing flux comprises the following components in percent by mass: 0.001-0.01 percent of rubidium fluoride, 11.0-45.0 percent of cesium fluoride, 0.01-2.0 percent of aluminium hydroxide, 0.01-5.0 percent of potassium fluoride, 0.01-0.04 percent of zinc fluoride, and the balance of aluminum fluoride. The brazing flux can meet the requirements of aluminium-steel brazing, aluminium-copper brazing and aluminium-aluminium brazing synchronously and is high in activity.

Description

Technical field [0001] The invention belongs to the field of brazing materials of non-metallic materials, and specifically relates to a cesium rubidium flux containing zinc fluoride capable of brazing aluminum-steel, aluminum-copper and aluminum-aluminum. Background technique [0002] With the rapid development of aerospace, automotive, rail transit, home appliances and other industries, aluminum-aluminum structures have been widely adopted. At the same time, there are more and more applications for composite structures of copper and aluminum alloys, steel and aluminum alloys, and aluminum-steel and aluminum-copper metal composite structures have been widely used in automobiles, home appliances and other fields. However, so far, there are still many unsolved problems in the welding of aluminum-steel and aluminum-copper metal composite materials. [0003] The applicant conducted a literature search. Among the published Chinese patent documents, such as "A new type of flux for brazi...

AI Technical Summary

Problems solved by technology

Although the invention can simultaneously meet the brazing requirements of "aluminum-copper", "aluminum-steel" and "aluminum-aluminum" and has high activity, the content of rubidium fluoride (RbF) is as high as 0.12 mole-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 Unsatisfactory; CN201310445105.3 recommended "a new type of brazing flux for stainless steel and aluminum brazing" can solve the brazing of aluminum-steel dissimilar materials, but can not braze aluminum-copper dissimilar materials; CN201410076059.9 discloses a A kind of "Cesium Rubidium Flux Containing Rubidium for Brazing 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, its fluorine The content of rubidium (RbF) is as high as 0.12 moles to 0.5 moles, which is expensive, and the cost is too high when used in large quantities

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