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Phosphatization and micro-arc oxidation compound treatment method of magnesium alloy surface

A technology of micro-arc oxidation and surface phosphating, which is applied in the field of magnesium alloy surface phosphating and micro-arc oxidation composite treatment, and magnesium alloy surface treatment. , Small contact angle, the effect of hindering corrosion

Inactive Publication Date: 2010-01-27
DONGGUAN EONTEC CO LTD
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Problems solved by technology

However, due to the single surface treatment method used in actual production, its stability is not good enough, the combination with the substrate is not firm, and there are still some defects in adsorption and corrosion resistance.

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  • Phosphatization and micro-arc oxidation compound treatment method of magnesium alloy surface

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Embodiment Construction

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] A magnesium alloy surface phosphating and micro-arc oxidation composite treatment method, as shown in the attached figure, firstly carry out pretreatment on the magnesium alloy surface: polishing and grinding-alkaline degreasing-twice washing-surface conditioning treatment; then put into phosphating Phosphating treatment in the treatment solution: temperature of the treatment solution, 30°C-50°C, treatment time, 10-20 minutes; after cleaning, perform micro-arc oxidation treatment: put it in the electrolyte of the silicate system, and perform micro-arc oxidation treatment The parameters are; voltage: step-by-step voltage increase method, termination voltage 320V, current density: 20mA / cm 2 ~100mA / cm 2 , Frequency: 300~500HZ, Energy Level: 19~21, Conductivity: 25000~30000us / cm, PH: 12~14, Temperature<37℃;

[0023] Finally, the post-tre...

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Abstract

The invention discloses a phosphatization and micro-arc oxidation compound treatment method of a magnesium alloy surface, which comprises the steps: firstly, pre-treating the magnesium alloy surface; then phosphatizeing; micro-arc oxidizing after washing; and finally post-treating the magnesium alloy surface: sealing treatment and spraying and coating an organic coating. Magnesium alloy is treated in compound phosphatization treatment liquid; a compound phosphate chemical composition film is formed on the surface; a layer of nonmetal and nonconductive phosphate film is produced, thereby effectively inhibiting the corrosion of the magnesium alloy and reducing the wear of the magnesium alloy surface; and after the magnesium alloy surface is micro-arc oxidized, the corrosion resistant performance, the film hardness, the wear resistant performance and the bonding force with a base body are obviously enhanced by the special micro-texture structure of a micro-arc oxidation ceramic layer. Because the compound surface treatment mode of the magnesium alloy is adopted in the method, the stability, the absorption performance, the wear resistant performance and the corrosion resistant performance are largely enhanced and the combination with the base body is firm. The method is suitably used for the surface treatment of large-scale magnesium alloy products.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of metal materials, and relates to a method for surface treatment of magnesium alloys, in particular to a composite treatment method of phosphating and micro-arc oxidation on the surface of magnesium alloys. Background technique [0002] Due to its excellent structural properties and light weight, magnesium alloys are competitors or substitutes for engineering plastics, aluminum alloys and steel in many fields today, especially in those fields where weight reduction is of great significance. Magnesium alloys are also widely used in industrial sectors such as automobiles, aerospace, electronics, military and nuclear energy, as well as the "lightweight" of vehicles and hand tools to meet the special technical requirements of audio-visual equipment, computers and reading equipment. However, the electrode potential of magnesium alloy is very low, so it is easily corroded. Although magnesium...

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Application Information

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IPC IPC(8): C25D11/30C25D11/36
Inventor 李扬德
Owner DONGGUAN EONTEC CO LTD
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