A method for crushing an oxide film on the surface of an aluminum alloy

Abstract

The invention discloses a breaking method of an oxidation film on the surface of aluminum alloy. The method comprises the steps of surface treatment, anti-soldering agent coating, vacuumizing soldering and sealing, heating, magnet discharging, traveling of a magnet in whole selected areas along a predetermined path in a point-by-point moving mode and the like. According to the technical scheme, huge impulse electromagnetic force generated by a pulsed high magnetic field is utilized for acting on the surface of the aluminum alloy, the aluminum alloy is deformed to a certain extent, accordingly,the compact oxidation film on the surface of the aluminum alloy is broken, and thus, diffusion connection of the aluminum alloy is achieved; and in addition, since aluminum alloy test pieces are arranged on a platform which can move spatially, a magnet point-by-point moving method is utilized, selective area treatment is achieved, and a new technical approach is provided for achieving high-quality connection and machining of the aluminum alloy.

Description

technical field [0001] The invention relates to an electromagnetic forming technology, in particular to a method for crushing an oxide film on the surface of an aluminum alloy. Background technique [0002] Aluminum alloy has the advantages of low density, high specific strength, high specific stiffness, good corrosion resistance, and high fatigue resistance. It is one of the light alloy materials widely used in the aerospace field. [0003] However, a dense oxide film is easily formed on the surface of aluminum alloy. Even after it is removed by mechanical or chemical means, if it is exposed to the air, it will oxidize again and continue to form an oxide film. The existence of this oxide film will have a huge impact on the diffusion bonding, brazing, welding, etc. of aluminum alloys, reduce the welding quality, and even fail to connect. [0004] For example, the multi-layer hollow structure prepared by superplastic forming / diffusion bonding technology (SPF / DB) has the char...

AI Technical Summary

Problems solved by technology

However, the multilayer hollow structure of aluminum alloys has not been widely used, because the diffusion bonding technology of aluminum alloys has not been well solved so far. The main reason is that a dense and stable oxide film is easily formed on the surface of aluminum alloys at room temperature. , the oxide film neither decomposes nor dissolves in the matrix during the diffusion bonding process, which seriously hinders the interdiffusion of aluminum atoms, resulting in the inability to form a diffusion bonding interface

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