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Surface treatment method for magnesium alloy

A surface treatment, magnesium alloy technology, applied in the direction of metal material coating process, etc., can solve the problems of poor electromagnetic shielding effect, corrosion resistance, low adhesion, not suitable for surface protection of magnesium alloy electronic products, etc., and the production time is short , good electrical conductivity, meet the effect of environmental protection and sustainable development

Inactive Publication Date: 2015-04-29
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical conversion coatings produced by these chromium-free treatment methods are thin, have low corrosion resistance and adhesion, and have poor electromagnetic shielding effects, which are not suitable for surface protection of magnesium alloy electronic products.

Method used

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  • Surface treatment method for magnesium alloy
  • Surface treatment method for magnesium alloy
  • Surface treatment method for magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Grind and load the AZ91D magnesium alloy chain tensioning mechanism.

[0031] (2) Pretreatment process: immerse the polished AZ91D magnesium alloy chain tensioning mechanism in a pickling tank filled with a phosphoric acid solution with a concentration of 85%, ultrasonically treat it for 2.5 minutes at room temperature, and then enter the first distilled water washing tank , ultrasonic treatment at room temperature for 30 seconds, take it out and dry it with hot air; then immerse it in a degreasing tank filled with sodium hydroxide 5g / L, trisodium phosphate 40g / L, sodium carbonate 25g / L, heat to 58°C, and ultrasonically treat for 8 Minutes later, enter the second distilled water washing tank, ultrasonic treatment at room temperature for 20 seconds, take it out and dry it with hot air; after that, immerse it in an activation tank with a concentration of 5% hydrofluoric acid, and conduct ultrasonic treatment at room temperature for 60 seconds. Then immerse in the thir...

Embodiment 2

[0034] (1) Grind and load the magnesium alloy fuel tank.

[0035] (2) Pretreatment process: immerse the polished magnesium alloy fuel tank in a pickling tank filled with a phosphoric acid solution with a concentration of 85%, ultrasonically treat it at room temperature for 0.5 minutes, then enter the first distilled water washing tank, and ultrasonically treat it at room temperature Treat for 50 seconds, take it out and dry it with hot air; then immerse it in a degreasing tank filled with sodium hydroxide 30g / L, trisodium phosphate 10g / L, sodium carbonate 12g / L, heat to 68°C, ultrasonic treatment for 15 minutes, enter In the second distilled water washing tank, ultrasonic treatment at room temperature for 50 seconds, take it out and dry it with hot air; after that, immerse it in the activation tank with 5% hydrofluoric acid, ultrasonic treatment at room temperature for 20 seconds, and then immerse in the third Distilled water washing tank, ultrasonic cleaning at room temperatu...

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Abstract

The invention relates to a surface treatment method for magnesium alloy. The surface treatment method disclosed by the invention comprises the following steps: (1), polishing and feeding a magnesium alloy component; (2), carrying out pre-treatment, such as acid pickling, ultrasonic treatment, degreasing and activating; and (3), carrying out chemical film-forming treatment, ultrasonic oscillation cleaning and the like under the action of a magnetic field. According to the invention, a film is chemically formed by using a treatment solution mainly containing stannate under the action of the magnetic field, so that the surface treatment method is free from pollution and environment-friendly; the treatment solution can be repetitively used; therefore, the resource is saved; the production cost is reduced; the process is simple; an automatic production line is easily formed; the adhesive force and the anti-corrosion property of a chemical conversion film and the macro-properties of parts formed under the action of the magnetic field are good; the properties are better; a stannate film layer is thinner; the average resistance is less than 0.5 omega; and the surface treatment method for magnesium alloy disclosed by the invention has good electrical conductivity and electromagnetic shielding effect, and is particularly applied to surface protection of magnesium alloy electronic products.

Description

technical field [0001] The invention belongs to the technical field of metal materials and relates to a surface treatment method for magnesium alloy materials. Background technique [0002] Magnesium alloys have attracted widespread attention due to their small specific gravity, good biocompatibility and many other advantages. But because magnesium is very active, the problem of corrosion resistance seriously limits its further promotion and application. At present, in the surface anticorrosion technology of magnesium alloy, according to the film forming conditions, it can be classified into two categories: chemical film forming and anodic oxidation film forming. Therefore, it is still difficult to promote the use of the effectiveness of the liquid and the stability of the temperature of the treatment liquid. The chemical conversion process requires simple equipment, less investment, easy operation, and low cost. It is generally used as the bottom layer of the coating to e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/60C23C22/78
CPCC23C22/60C23C22/73C23C22/78
Inventor 金华兰赖勇来杨湘杰郭洪民
Owner NANCHANG UNIV
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