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A kind of anti-corrosion method of magnesium and its alloy and application of mgco3 layer as anti-corrosion layer

An anti-corrosion and alloying technology, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of expensive lithium, limited lithium resource reserves, unsatisfactory, etc., and achieve good combination and good mechanical properties , not easy to break or fall off

Active Publication Date: 2018-09-04
国科镁业科技(河南)有限公司
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with metallic magnesium, lithium is expensive and the reserves of lithium resources are limited and cannot even meet the growing demand for lithium-ion batteries, making it impossible for Mg-Li alloys to completely replace other magnesium alloys and meet all the needs of magnesium in the industry. , so a broad-spectrum anti-corrosion method applicable to metal magnesium and all its alloys needs to be introduced urgently

Method used

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  • A kind of anti-corrosion method of magnesium and its alloy and application of mgco3 layer as anti-corrosion layer
  • A kind of anti-corrosion method of magnesium and its alloy and application of mgco3 layer as anti-corrosion layer
  • A kind of anti-corrosion method of magnesium and its alloy and application of mgco3 layer as anti-corrosion layer

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Experimental program
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Effect test

Embodiment 1

[0061] Example 1. Activation of CO by a 300keV high-energy electron beam in a transmission electron microscope 2 gas, and then place the submicron-scale magnesium pillars processed by the focused ion beam in it for about 20min ( figure 2 ), let the MgO layer and the activated CO 2 Fully reacted to form dense MgCO 3 The protective layer. Then the magnesium microcolumns with the surface of loose MgO and the treated surface of MgCO 3 The magnesium microcolumns were soaked in deionized water for 3 min for corrosion test. After taking it out, it was observed in the transmission electron microscope that the magnesium sample whose surface was loose and porous MgO was severely corroded, see image 3 a, while dense MgCO 3 A sample of the protective layer remains intact, see image 3 b. It shows that this treatment method has a significant effect on improving the corrosion resistance of microscopic samples.

Embodiment 2

[0062] Embodiment 2. Place the magnesium metal sample of 5mm * 5mm through wire cutting, grinding and polishing in the CO produced by glow discharge. 2 In the plasma, the sample morphology before and after treatment is as follows: Figure 4 a, d and b, shown in c) for processing, voltage: 500V, current: 110mA, CO in the chamber 2 Air pressure: 200Pa, processing time: 4h. CO 2 Plasma reacts with MgO naturally generated on the surface of metallic magnesium to form uniform and dense MgCO 3 The protective layer. In order to test the corrosion resistance of the treated samples, the untreated and treated samples were soaked in the - in the aqueous solution for 20min, the microscopic characterization results showed that severe corrosion occurred on the surface of the untreated sample. Figure 4 c, in CO 2 The samples treated in the plasma were largely intact, see Figure 4 f. Further quantitative electrochemical test results showed that CO 2 The open circuit voltage (OCV) an...

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Abstract

The invention provides an anti-corrosion method of magnesium and magnesium alloy and an application of an MgCO3 layer as an anti-corrosion layer. Plasma treatment is performed on CO2 gas so as to increase the reactivity of the CO2 gas, so that the CO2 gas reacts with a porous MgO film generated by natural oxidation on the surface of magnesium metal in the air at room temperature so as to generate a MgCO3 protective layer to increase the corrosion resistance of the magnesium and the magnesium alloy. The method has the advantages of energy conservation, environmental friendliness, simple process and no need of heating in a reaction process, is suitable for all magnesium and magnesium alloy samples and is a wide anti-corrosion method, additionally, the performance of the magnesium and the magnesium alloy and the product precision cannot be changed, and surface treatment can be performed on any complex geometrical sample.

Description

technical field [0001] The invention belongs to the field of metal corrosion and protection, in particular to a method for preventing corrosion of magnesium and its alloys and MgCO 3 layer as an anti-corrosion layer. Background technique [0002] Since the early 1990s, the application and development trend of major metal materials in the world has undergone significant changes. The application of traditional materials such as steel, copper, aluminum, and zinc has grown slowly, while light metal materials represented by magnesium alloys have sprung up suddenly. 20% growth rate. Magnesium is rich in resources and low in price; magnesium is the lightest structural metal with a density of 1.7g / cm 3 , only 19% of copper, 22% of iron, 39% of titanium, and 64% of aluminum. After magnesium alloying, it has many excellent properties, such as high specific strength, good electrical and thermal conductivity, good biocompatibility, good damping and shock absorption and electromagneti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/06
CPCC23C8/06
Inventor 单智伟王悦存苗育聪杨楠刘博宇
Owner 国科镁业科技(河南)有限公司
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