Preparation method of conductive anticorrosive coating on magnesium alloy surface

A kind of conductive anti-corrosion, magnesium alloy technology, applied in the direction of surface reaction electrolytic coating, coating, electrolytic coating, etc., can solve the problems of wear resistance, poor corrosion resistance, brittle and porous, etc., to achieve the effect of improving anti-corrosion performance

Inactive Publication Date: 2018-04-24
XIAN UNVERSITY OF ARTS & SCI
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Problems solved by technology

These surface treatment methods have some disadvantages: the film layer formed by chemical oxidation is thin, brittle and porous, and has poor wear resistance and corrosion resistance. It is generally used as a decoration and intermediate protective layer.
Therefore, only the use of micro-arc oxidation technology can only achieve its anti-corrosion performance, and there is an urgent need for a technical approach that is both anti-corrosion and conductive.

Method used

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  • Preparation method of conductive anticorrosive coating on magnesium alloy surface
  • Preparation method of conductive anticorrosive coating on magnesium alloy surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Select an AZ31 magnesium alloy with a size of 50×100×5mm, soak it in absolute ethanol, and ultrasonically clean it for use, and use alkali washing, water washing, and acid leaching to remove oxides on the metal surface and loosely attached cold-worked metal chips and embedded surfaces. Dirt, the formula of alkaline cleaning solution is: Na 2 CO 3 (20g / L), Na 3 PO 4 (18 g / L), Na 2 SiO 3 (10g / L), KOH (1g / L), temperature 50°C, alkali washing time 6min; acid leaching solution is HNO 3 (70g / L), treat at room temperature for 2 minutes.

[0029] After the sample is processed, the oxidation and conductivity process is carried out in the chromate solution. The solution formula is: CrO 3 (4g / L), Na 2 Cr 2 o 7 (3g / L), NaF (0.5g / L), corrosion inhibitor (0.5g / L), treat at room temperature for 10 minutes, take out the magnesium alloy parts, and dry them for later use.

[0030] like figure 2 As shown, the surface 6 on the magnesium alloy part 1 that needs to be assembled a...

Embodiment 2

[0033] Embodiment 2 performance test

[0034] After the AZ31 magnesium alloy material in Example 1 is conductively oxidized, a layer of chemical conversion film is formed on the surface of the material. According to the resistance test, this film has little effect on the conductivity of the magnesium alloy material.

[0035] The corrosion resistance test is carried out by the salt spray test in the environmental test method of military equipment laboratory (GJB150.11A-2009). After the salt spray test, there is no change on the surface of the sample, and the protection effect is good. According to the damp heat test standard in the GJB150.9A-2009 method, the test results meet the product performance requirements.

[0036] It should be noted that the preparation method of the conductive anti-corrosion coating disclosed in the present invention is also applicable to other brands of magnesium alloy materials, such as AZ91 series, AM series, AS series and AE series.

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Abstract

The invention discloses a preparation method of a conductive anticorrosive coating on a magnesium alloy surface, and relates to the field of conductive coating. The preparation method comprises the following steps of carrying out early treatment on the magnesium alloy materials, and conducting oxidation treatment on the magnesium alloy material in a chromate solution; the non-micro-arc oxidation surface of the magnesium alloy material parts is protected by a polytetrafluoroethylene tool; then micro-arc oxidation treatment and disassembly tool for each magnesium alloy material part in sodium silicate solution. The electric conduction oxidation technology and the micro-arc oxidation technology are combined, and the functions of corrosion prevention and electric conduction on the surface of the magnesium alloy materials are achieved. The method has the beneficial effects that the corrosion resistance of the magnesium alloy material parts is improved while the electrical conductivity between the magnesium alloy materials is not reduced.

Description

technical field [0001] The invention belongs to the field of conductive coatings, and relates to a method for preparing a conductive anti-corrosion coating on the surface of a magnesium alloy. It specifically relates to a combination technology of conductive oxidation and micro-arc oxidation, which realizes the function of both anticorrosion and conductivity on the surface of materials. Background technique [0002] The bottleneck limiting the application of magnesium alloys lies in their extremely poor corrosion resistance. Magnesium alloys have high chemical and electrochemical activities and are easily corroded in the atmosphere, especially in humid and coastal areas. Therefore, the marine environment has always been a restricted area for the use of magnesium alloys. However, as the demand for light weight of shipboard equipment becomes more and more urgent, and magnesium alloy materials have to be used, the corrosion protection of magnesium alloys has become a problem t...

Claims

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Application Information

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IPC IPC(8): C25D11/30
CPCC25D11/026C25D11/30
Inventor 穆耀钊戴君张秀萍叶芳霞李雷谢燕翔宁富平
Owner XIAN UNVERSITY OF ARTS & SCI
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