Surface treatment method for magnesium and magnesium alloys

A surface treatment, magnesium alloy technology, applied in the direction of metal material coating technology, etc., can solve problems such as unfavorable industrial production, and achieve the effects of low production cost, improved corrosion resistance, and excellent corrosion resistance

Inactive Publication Date: 2010-06-30
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there are some studies on self-assembled films on the surface of metals such as Au, Ag, Cu, Fe, Al, etc., there are few studies on organic self-assembled films on the surface of magnesium alloys. The self-assembled films reported so far all use low-concentration solutions, The process of processing for a long time is not conducive to industrial production

Method used

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  • Surface treatment method for magnesium and magnesium alloys
  • Surface treatment method for magnesium and magnesium alloys
  • Surface treatment method for magnesium and magnesium alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Get 99.99% pure magnesium to carry out the surface treatment of stearic acid according to the inventive method:

[0026] A. Mechanical decontamination and cleaning: clean the metal magnesium after sandblasting or polishing with sandpaper, ultrasonic cleaning with acetone for 10 minutes, and ultrasonic cleaning in absolute ethanol for 10 minutes after washing with water. The above cleanings are all carried out at room temperature;

[0027] B. heat treatment: the above-mentioned metal magnesium is heated to 500 ℃, the holding time is 10 hours, and slowly cooled to room temperature with the furnace;

[0028] C. Cleaning: heat-treated samples were ultrasonically cleaned in distilled water and absolute ethanol for 10 minutes respectively, and the above cleanings were all performed at room temperature;

[0029] D. Immersion film: at a water bath temperature of 37°C, immerse the film for 2 hours to obtain an organic film layer on the surface of metal magnesium, wherein the con...

Embodiment 2

[0032] The difference from Example 1 is that the Mg0.88Ca alloy is used for surface treatment, the immersion solution for the immersion film is 0.4mol stearic acid ethanol solution, and the immersion treatment time of the magnesium alloy is 1.5 hours.

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Abstract

The invention relates to an organic surface treatment method for magnesium and magnesium alloy. The method comprises the following steps: surfaces of the magnesium and magnesium alloy are polished and cleaned, and the magnesium and magnesium alloy is dipped into absolute ethyl alcohol to be cleaned ultrasonically for 5 to 10 minutes after being cleaned by acetone ultrasonically and cleaned by water; heat treatment is performed when temperature reaches 500 to 510 DEG C; the holding time is 9 to 11 hours; the cooling is performed gradually with the temperature decrement of a furnace; ultrasoniccleaning is performed for 5 to 10 minutes in distilled water and absolute ethyl alcohol; then the magnesium and magnesium alloy is soaked into 0.3 to 0.5mol / L stearic acid alcohol solution; the soak time is 1.5 to 2 h; and then the magnesium and magnesium alloy is taken out; and ultrasonic cleaning is performed in absolute ethyl alcohol for 1.5 to 2 minutes, namely corrosion-resistant surface layer is formed on the surface of the material. The method of the invention ensures that the corrosion resisting property of the magnesium alloy is improved, the corrosion rate of the material is reduced, and materials which do harm for human body are not adopted; the invention has the advantages of good biocompatibility, simple production process and low cost, and the environmental pollution is avoided.

Description

technical field [0001] The invention relates to a surface treatment method, in particular to a surface treatment method for magnesium and magnesium alloys. technical background [0002] Magnesium is the lightest metal structural material with many excellent properties, and is known as the most promising green structural material in the 21st century; however, its poor corrosion resistance has become the biggest obstacle to its application, and it is the focus and focus of research in various countries. Difficulties to overcome. At present, the research is mainly carried out from the aspects of adding alloying elements and surface modification to magnesium alloys. So far, surface protection methods are mainly used to improve the corrosion resistance of the magnesium alloy surface, such as chemical conversion coating, micro-arc oxidation, anodic oxidation treatment, various organic coatings, coatings, etc. However, because the protective layer formed by the above-mentioned ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/78C23C22/70C23C22/82
Inventor 高家诚乔丽英王勇
Owner CHONGQING UNIV
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