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Method for preparing MgZn2, Zn and oxide three-layer antiseptic films on surfaces of magnesium alloys

An oxide film, three-layer anti-corrosion technology, applied in the direction of metal material coating process, coating, ion implantation plating, etc., can solve the problems of limitation and poor corrosion resistance, and achieve the effect of preventing contact

Active Publication Date: 2019-11-29
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its poor corrosion resistance, it is subject to certain restrictions.

Method used

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  • Method for preparing MgZn2, Zn and oxide three-layer antiseptic films on surfaces of magnesium alloys
  • Method for preparing MgZn2, Zn and oxide three-layer antiseptic films on surfaces of magnesium alloys

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) AM50 magnesium alloy pretreatment method, after cutting the magnesium alloy into a size of 10mm×10mm×1mm, grinding and polishing with SiC sandpaper of No. 600 and No. 1000 respectively, first remove the surface oil with an alkaline degreaser, Reuse 85% H 3 PO 4 Etch for 30-40s, remove the surface oxide film, wash with distilled water and soak in absolute ethanol for later use;

[0024] (2) Put the pretreated magnesium alloy into a vacuum evaporation device and evacuate until the vacuum degree is better than 1×10 - 3 After MPa, the zinc particles are heated to 350°C, and the zinc vapor condenses on the surface of the magnesium alloy to form a zinc film;

[0025] (3) Put the magnesium alloy after evaporating zinc into the quartz tube, vacuumize the quartz tube and seal it. Put the quartz tube into a box furnace and anneal at 250°C for 2 hours;

[0026] (4) packing the magnesium alloy after the annealing in the quartz tube with the homogeneous mixture of the high-...

Embodiment 2

[0029](1) AZ91D magnesium alloy pretreatment method, after cutting the magnesium alloy into a size of 10mm×10mm×1mm, grinding and polishing with SiC sandpaper of No. 600 and No. 1000 respectively, first remove the surface oil with an alkaline degreaser, Reuse 85% H 3 PO 4 Etch for 30-40s, remove the surface oxide film, wash with distilled water and soak in absolute ethanol for later use;

[0030] (2) Put the pretreated magnesium alloy into a vacuum evaporation device and evacuate until the vacuum degree is better than 1×10 - 3 After MPa, the zinc particles are heated to 400°C, and the zinc vapor condenses on the surface of the magnesium alloy to form a zinc film;

[0031] (3) Put the magnesium alloy after evaporating zinc into the quartz tube, vacuumize the quartz tube and seal it. Put the quartz tube into a box furnace and anneal at 300°C for 2 hours;

[0032] (4) packing the magnesium alloy after the annealing in the quartz tube with the homogeneous mixture of the high-...

Embodiment 3

[0035] (1) ZK61S magnesium alloy pretreatment method, after cutting the magnesium alloy into a size of 10mm×10mm×1mm, grinding and polishing with SiC sandpaper of No. 600 and No. 1000 respectively, first remove the surface oil with an alkaline degreaser, Reuse 85% H 3 PO 4 Etch for 30-40s, remove the surface oxide film, wash with distilled water and soak in absolute ethanol for later use;

[0036] (2) Put the pretreated magnesium alloy into a vacuum evaporation device and evacuate until the vacuum degree is better than 1×10 - 3 After MPa, the zinc particles are heated to 500°C, and the zinc vapor condenses on the surface of the magnesium alloy to form a zinc film;

[0037] (3) Put the magnesium alloy after evaporating zinc into the quartz tube, vacuumize the quartz tube and seal it. Put the quartz tube into a box furnace and anneal at 350°C for 2 hours;

[0038] (4) Pack the homogeneous mixture of high-purity powders of 875mgFe and 1125mgFeO and the magnesium alloy after ...

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Abstract

The invention discloses a method for preparing MgZn2, Zn and oxide three-layer antiseptic films on the surfaces of magnesium alloys. Zn film layers are evaporated on the surfaces of the magnesium alloys in a vacuum state; and the magnesium alloys and the zinc films are annealed to generate corrosion-resistance intermetallic compounds on interfaces. Then, the magnesium alloys are selectively oxidized; and part of alloy elements in zinc and the magnesium alloys are dispersed to the surfaces for oxidation to generate oxide films. The intermetallic compounds, the zinc films and the oxide films cover the surfaces of the magnesium alloys at the same time to effectively resist corrosion.

Description

technical field [0001] The invention belongs to the field of magnesium alloy anticorrosion, in particular to a method for preparing MgZn on the surface of magnesium alloy 2 , Zn and oxide three-layer anti-corrosion film method. Background technique [0002] Magnesium alloy has excellent physical properties such as low density, high specific strength and specific modulus, excellent damping and shock absorption performance and good electromagnetic shielding performance. At the same time, magnesium alloy also has the advantages of low recycling energy consumption and easy processing, which makes its application in aviation, automobiles, and 3C electronic products have obvious advantages over other structural materials. However, it is limited due to its poor corrosion resistance. The corrosion of magnesium alloys is essentially an electrochemical and chemical process in which magnesium is oxidized to magnesium oxide or magnesium hydroxide. [0003] The current method of prepa...

Claims

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Application Information

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IPC IPC(8): C23C14/24C23C14/16C23C14/58C23C14/02
CPCC23C14/021C23C14/16C23C14/24C23C14/5806C23C14/5853
Inventor 苏旭平杨昊妤刘亚王建华吴长军涂浩彭浩平
Owner CHANGZHOU UNIV
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