Soldering aluminum and brazing flux of aluminum alloy

Abstract

A flux of a welding aluminum and aluminum alloy relates to a brazing material. The aluminum alloy-aluminum alloy and the aluminium-aluminium alloy brazing flux of the invention is calculated by the mass percentage, with eutectic AIF3-CsF flux ranging from 97.0 to 99.9, zinc fluoride ranging from 0.1 to 3.0, tin fluoride ranging from 0 to 0.5. The invention is the flux for the aluminum alloy-aluminum alloy and the aluminium-aluminium alloy with high tensile strength.

Description

technical field

[0001] The invention relates to a brazing material, in particular to a brazing material for aluminum alloy-aluminum alloy and aluminum-aluminum alloy brazing. Background technique

[0002] Compared with other metals, aluminum and aluminum alloys are more difficult to braze, mainly because a layer of dense and chemically stable Al is easy to form on the surface of aluminum. 2 o 3 film, difficult to remove. There are many research results on fluxes for aluminum alloy brazing at home and abroad. Professor Zhang Qiyun of Peking University published a paper in ["(Thermochimica Acta", 303(1997)]: "A study on the phase diagram of AlF 3 -CsF system", which exposes AlF 3 -CsF system phase diagram, pointing out that the eutectic composition is AlF 3 :CsF=42.0:58.0 (molar ratio), melting temperature is 471°C. This type of flux has high brazing performance, special activity to aluminum alloys with high magnesium content, and high stability to flames. It can be use...