Corrosion resistant technique for magnesium alloy combining aluminum cladding and plastic deformation

Abstract

The invention discloses a corrosion resistant technique of magnesium alloy combining aluminum cladding and plastic deformation, comprising the steps of: cladding a layer of aluminum or aluminum alloy on the surface of the magnesium alloy, then performing plastic deformation at a relatively high temperature under appropriate conditions to form favorable physical weld between the aluminum cladding and the aluminum alloy base on the basis of mechanical bond to produce a very thin intermetallic compound diffusion layer, which has superior corrosion resistance to significantly reduce the corrosion rate of the magnesium alloy. Meanwhile, the surface of the magnesium alloy base is clad with aluminum or aluminum alloy that has very high passivation so as to avoid partial corrosion of battery resulting from all kinds of defects and achieve the purpose of improving the corrosion resistance of the magnesium alloy base. Additionally, plastic deformation can refine the grains of the magnesium alloy base and the aluminum cladding, so as to improve the mechanical property of the both and further improve the corrosion resistance of the magnesium alloy base and the aluminum cladding.

Description

technical field [0001] The invention relates to a magnesium alloy anticorrosion process, in particular to a magnesium alloy anticorrosion process combining aluminum cladding and plastic deformation. Background technique [0002] Magnesium alloy is light in weight (density is 1.74g / cm 3 , is 2 / 3 of aluminum, 1 / 4 of steel), high specific strength and specific stiffness, good electromagnetic shielding performance, excellent shock absorption and shock resistance, and easy to form and recycle. In recent years, as a rapidly emerging engineering material, magnesium alloy has grown rapidly at a rate of 15% per year. It has a very important role in 3C (Communications, Computer and Consumer Electronics) products, automobiles, aerospace, military and other industries. Wide application prospects. [0003] Nevertheless, poor corrosion resistance has always been the main bottleneck limiting magnesium alloys as structural materials. [0004] At present, the widely used magnesium-aluminu...

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Problems solved by technology

[0010] In view of some shortcomings in current magnesium alloy anti-corrosion technology, such as the addition of rare earth elements will make the price expensive, the surface chemical treatment will pollute the environment, thermal spraying will easily cause the sprayed layer to fall off, and the overall component strength is low. The combination of cladding and plastic deformation improves the strength of magnesium alloys while improving the corrosion resistance of magnesium alloys.

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