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Method for preparing anti-microbial, mildew-resistant and corrosion-resistant membrane layer on magnesium metal surface

A surface antibacterial, antibacterial and antifungal technology, which is applied in the field of preparation of oxide film on the surface of magnesium metal, can solve the problems of oxide film burning, antibacterial and antifungal performance research, etc., and achieve good corrosion resistance, excellent antibacterial and antifungal Mildew performance, promotion of anti-mildew effect

Inactive Publication Date: 2017-03-08
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, direct current is mostly used for the anodic oxidation of magnesium metal, and the use of direct current for anodic oxidation will inevitably lead to the enrichment of anions near the anode area, especially OH- (the movement speed of OH- is very fast), resulting in poor stability of Mg in the oxide film ( Oh) 2 Formation, and the direct current flows through the oxide film continuously during the reaction, generating a large amount of Joule heat, if the heat is not dissipated in time, it will cause the oxide film to burn
At present, the research on the anodic oxidation film of magnesium metal focuses on the corrosion resistance and wear resistance, and there is no report on the antibacterial and antifungal properties.

Method used

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  • Method for preparing anti-microbial, mildew-resistant and corrosion-resistant membrane layer on magnesium metal surface
  • Method for preparing anti-microbial, mildew-resistant and corrosion-resistant membrane layer on magnesium metal surface
  • Method for preparing anti-microbial, mildew-resistant and corrosion-resistant membrane layer on magnesium metal surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of pure magnesium metal, consisting of Mg and unavoidable impurities. Prepare an antibacterial, mildew-proof and corrosion-resistant film layer on the surface of pure magnesium metal, the specific steps are as follows:

[0032] (a) Cut pure magnesium into a cuboid of 20mm×60mm×2mm, polish the surface of pure magnesium step by step with 120#, 800# and 1200# water-grinding paper, clean it with deionized water, place it in acetone for 5min, and then use Rinse well with deionized water and blow dry. Drill a small hole at one end of the sample, use copper wire as the connecting wire, and seal the connection with epoxy resin.

[0033] (b) Preparation of oxidation solution: NaOH-40g / L, Na 2 SiO 3 -90g / L, Na 2 B 4 o 7 -50g / L, citric acid -12g / L, Ag 2 SO 4-2g / L, NiSO 4 -5g / L.

[0034] (c) Place two pretreated pure magnesium plates in an oxidizing solution for anodic oxidation, and pass through an alternating current with a frequency of 50 Hz and a current d...

Embodiment 2

[0038] A Mg-Zn alloy is prepared, the composition of which is Zn-2.0wt%, and the rest is Mg and unavoidable impurities.

[0039] The difference between the process method of this example and example 1 is that the solute of step (b) anodic oxidation solution consists of: NaOH-70g / L, NaOH-70g / L, Na 2 SiO 3 -80g / L, Na 2 B 4 o 7 -60g / L, citric acid -10g / L, AgNO 3 -10g / L, NiSO 4 -16g / L. Step (c) current density is 1.0A / dm 2 , the temperature of the oxidation solution is 20°C, and the oxidation time is 10 minutes. Other processing parameters and operating process are identical with embodiment 1.

[0040] After processing by the above process, the surface film thickness, antibacterial, mildew and corrosion resistance of Mg2Zn magnesium alloy are shown in Table 1.

Embodiment 3

[0042] A Mg-Zn alloy is prepared, the composition of which is Zn-2.0wt%, Ca-0.5wt%, and the rest is Mg and unavoidable impurities.

[0043] The difference between the process method of this example and example 1 is that the solute of step (b) anodic oxidation solution consists of: NaOH-50g / L, NaOH-50g / L, 2 SiO 3 -70g / L, Na 2 B 4 o 7 -80g / L, citric acid -16g / L, Ag 2 SO 4 -4g / L, NiSO 4 -10 g / L; In the step (c), the anodic oxidation AC current density is 2.5A / dm 2 , the temperature of the oxidizing solution is 20° C., and the oxidation time is 30 minutes; the temperature of the pure water in step (d) is 95° C., and the treatment time is 20 minutes. Other processing parameters and operating process are identical with embodiment 1.

[0044] After processing by the above process, the surface film thickness, antibacterial, mildew, and corrosion resistance of the Mg2Zn0.5Ca magnesium alloy are shown in Table 1.

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Abstract

The invention discloses a method for preparing an anti-microbial, mildew-resistant and corrosion-resistant membrane layer on a magnesium metal surface. Firstly a magnesium metal is pretreated, and then is put in an oxidation fluid. An alternating current with a current density of 0.5-2.5 A / dm<2> is connected. A layer of oxidation functional membrane is formed after the treatment is carried out for 10-40 minutes at the temperature of 15-30 DEG C. Then the magnesium metal is rinsed by deionized water and is sealed t in the pure water. The oxidation membrane layer with the thickness of 3-15[mu]m is obtained on the magnesium metal surface. The oxidation fluid contains the following solute: 40-80g / L NaOH, 50-90g / L Na2SiO3, 40-80g / L Na2B4O7, and 8-16g / L citric acid, and also contains soluble anti-microbial and mildew-resistant functional element salts. The magnesium metal surface after treatment by the method of the invention has a layer of the oxide membrane which takes a magnesia ceramic phase as a matrix. The anti-microbial and mildew-resistant functional elements Ag and Ni are dispersed and distributed in a matrix phase. The membrane layer has the good anti-microbial and mildew-resistant performance and good corrosion resistance, and can be used in many fields such as package and storage of food and clothing, and human body implantation medical instruments.

Description

technical field [0001] The invention relates to a preparation method of an oxide film on the surface of magnesium metal, in particular to a preparation method of an antibacterial, mildew-proof, corrosion-resistant oxide film on the surface of magnesium metal. Background technique [0002] Magnesium metal has superior properties such as high specific strength, good machining performance, good shock absorption capacity, good thermal conductivity, good electromagnetic shielding performance, excellent hydrogen storage performance, high die-casting productivity, easy cutting and processing, and easy recycling. As a high-quality metal structural material, magnesium metal is widely used in aerospace, automotive, electronics and medical equipment industries. [0003] Aluminum alloys are mostly used in food packaging, cooking and storage in the market. Aluminum is easy to enter the human body under corrosion, friction and high temperature conditions, and the accumulation of aluminum ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30
CPCC25D11/30
Inventor 白晶谭曦薛烽周健张越陆冶
Owner SOUTHEAST UNIV
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