Method for performing arc-added glow discharge ion diffusion coating on magnesium alloy plate

Abstract

The invention relates to a method for performing arc-added glow discharge ion diffusion coating on a magnesium alloy plate. By an arc-added glow discharge ion diffusion coating technology, the surface of the magnesium alloy plate is subjected to ion diffusion coating in an arc-added glow discharge ion diffusion coating furnace by using a titanium, copper and nickel anode target as a ion diffusion coating source, and the magnesium alloy plate as a glow discharge power cathode, and a diffusion coating layer is formed on the surface of the magnesium alloy plate; and according to the diffusion coating layer, the thickness is 5 to 10mu m, the surface hardness reaches HV100, and the corrosion resistance is improved by 90 percent. The method for performing arc-added glow discharge ion diffusion coating on the magnesium alloy plate is advanced in process, data are detailed and accurate, the fixation rate of the magnesium alloy plate and the diffusion coating layer is high, an alloyed layer is formed, and the method is a very ideal method for reinforcing the surface of the magnesium alloy plate.

Description

technical field [0001] The invention relates to a method for arc-added glow ion-dipping magnesium alloy plate, which belongs to the technical field of surface modification of non-ferrous metals. Background technique [0002] Magnesium alloys are widely used in aerospace, automobile manufacturing and electronics industries due to their low density, high specific strength, good processing and weldability. [0003] However, magnesium is an active metal with a standard electrode potential of -2.36V, and its corrosion resistance is extremely poor. Even at room temperature, it will undergo oxidation reactions with air; the chemical properties of magnesium alloys are active, and they will suffer from corrosion in humid and marine climates. Severe corrosion; the oxide film layer formed on the surface of magnesium alloy is loose and porous, and the protective effect on the substrate is extremely weak, which cannot meet the requirements of most harsh environments, so it also hinders t...

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Problems solved by technology

[0003] However, magnesium is an active metal with a standard electrode potential of -2.36V, and its corrosion resistance is extremely poor. Even at room temperature, it will undergo oxidation reactions with air; the chemical properties of magnesium alloys are active, and they will suffer in humid and marine climates. Severe corrosion; the oxide film layer formed on the surface of magnesium alloy is loose and porous, and the protective effect on the substrate is extremely weak, which cannot meet the requirements of most harsh environments, so it also hinders the popularization and application of magnesium alloy. Surface modification of magnesium alloy is a An effective way to improve its performance

[0004] At present, there are many methods for surface modification of magnesium alloy plates, such as electrochemical plating, anodic oxidation, chemical conversion treatment, laser surface modification, and ion implantation; electrochemical plating is low in production cost, but it is more harmful to the environment. Moreover, the bonding force between the electrochemical coating and the substrate is poor; the film structure produced by anodic oxidation surface modification is loose, and the obtained conversion film is relatively thin, which cannot be used as a long-term anti-corrosion protective film; after laser surface modification, laser remelting makes the surface hardness decrease. There is a problem with the homogenization of the deposited layer alloy; the modified layer obtained by ion implantation is very thin, which often cannot meet the required surface properties. In short, these existing methods are not effective, and some are still under research

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