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Composition for forming magnesium-lithium alloy surface anticorrosive coating system and preparation method of anticorrosive coating system

A technology of magnesium-lithium alloy and anti-corrosion coating, which is applied to the device for coating liquid on the surface, anti-corrosion coating, coating, etc., to achieve excellent anti-corrosion performance, improve environmental adaptability, and simple preparation process

Active Publication Date: 2020-12-04
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is a lack of organic coating protective materials with good anti-corrosion properties on the surface of magnesium-lithium alloys

Method used

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  • Composition for forming magnesium-lithium alloy surface anticorrosive coating system and preparation method of anticorrosive coating system

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preparation example Construction

[0046] According to a second aspect of the present invention, a method for preparing a magnesium-lithium alloy surface anti-corrosion coating system is provided, which is formed by using the above-mentioned composition for forming a magnesium-lithium alloy surface anti-corrosion coating system, such as figure 1 shown, including the following steps:

[0047] Step 1, after stirring and mixing the components in the anti-corrosion primer, perform homogenization, homogenize for 2-7 hours to form an anti-corrosion primer; homogenization means include but not limited to ball milling, sand milling, high-speed dispersion, etc.;

[0048] Step 2, spraying an anti-corrosion primer on the surface of the magnesium-lithium alloy after micro-arc oxidation, curing to form an anti-corrosion primer layer;

[0049] Step 3, spraying a sealing varnish on the surface of the cured anticorrosion primer layer, and curing to form a sealing varnish layer.

[0050] In a preferred embodiment, if a solvent...

Embodiment 1

[0057] Magnesium-lithium alloy surface anti-corrosion primer, its raw material ratio is: Lithium nitrate 5g, GK570 fluorocarbon polyurethane 80g, sericite 2g, butyl acetate 22g, after stirring and mixing evenly, use ball mill to grind and mix for 4 hours to form anti-corrosion primer.

[0058] The anti-corrosion primer was prepared by continuous spraying on the surface of the magnesium-lithium alloy substrate after micro-arc oxidation by air spraying process, and the thickness of the anti-corrosion primer layer was 60 μm.

[0059] After the anti-corrosion primer is dried and cured, use the air spraying process to continuously spray GK570 fluorocarbon polyurethane varnish on the surface of the anti-corrosion primer to seal the surface. The thickness of the sealed varnish layer is 20 μm. GK570 fluorocarbon polyurethane varnish contains 20wt% butyl acetate.

[0060] After the magnesium-lithium alloy surface anti-corrosion coating system was continuously sprayed with salt spray fo...

Embodiment 2

[0063] Magnesium-lithium alloy surface anti-corrosion primer, its raw material ratio is: Lithium chloride 5g, E44 epoxy resin 95g, sericite 15g, ethyl acetate 115g, after stirring and mixing evenly, use ball mill to grind and mix 7h to form anti-corrosion primer.

[0064] The anti-corrosion primer was prepared by continuous spraying on the surface of the magnesium-lithium alloy substrate after micro-arc oxidation by air spraying process, and the thickness of the anti-corrosion primer layer was 20 μm.

[0065] After the anti-corrosion primer is dried and cured, use the air spraying process to continuously spray E51 epoxy resin varnish on the surface of the anti-corrosion primer to seal the surface. The thickness of the sealed varnish layer is 20 μm. E51 epoxy resin varnish contains 80wt%.

[0066] After the magnesium-lithium alloy surface anti-corrosion coating system was continuously sprayed with salt spray for 1000 hours, the surface of the paint film of the three samples cha...

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Abstract

The invention provides a composition for forming a magnesium-lithium alloy surface anticorrosive coating system and a preparation method of the anticorrosive coating system, the composition comprisesanticorrosive primer and sealing varnish, and the anticorrosive primer is prepared from the following raw materials in parts by mass: 70-100 parts of high-density tough resin, 1-25 parts of lithium salt inorganic matter and 0-15 parts of flaky shielding material; the sealing varnish comprises high-density resin; the anticorrosive primer is used for forming an anticorrosive primer primer layer on the surface of the magnesium-lithium alloy, and the sealing varnish is used for forming a sealing varnish layer on the surface of the anticorrosive primer layer; when the anticorrosive coating system is prepared, the anticorrosive primer layer is firstly formed on the surface of the magnesium-lithium alloy, and then the sealing varnish layer is formed. According to the composition and the preparation method of the coating system, the corrosion resistance is excellent, the corrosion resistance effect that the magnesium-lithium alloy resists neutral salt mist for 1000 h is achieved, the composition and the coating system can be used for corrosion resistance of the surfaces of aircrafts such as missile and rocket ships adopting the light magnesium-lithium alloy, the environmental adaptabilityis improved, and meanwhile the composition and the coating system have potential wide application prospects in the civil field.

Description

technical field [0001] The invention belongs to the field of anti-corrosion coatings, in particular to a composition for forming an anti-corrosion coating system on the surface of a magnesium-lithium alloy and a preparation method for the anti-corrosion coating system. Background technique [0002] In order to meet the requirements of light weight, high utility and fast response of spacecraft, it is urgent to adopt new structural materials with lighter weight, lower cost and shorter manufacturing cycle. The new generation of magnesium-lithium (Mg-Li) alloy has excellent specific stiffness, specific strength and electromagnetic shielding performance. It can greatly reduce the weight of spacecraft compared with traditional aluminum alloys while meeting technical indicators, and has broad application prospects. However, due to the unique mechanical properties and internal structure of magnesium alloys, Mg-Li alloys also have disadvantages such as insufficient corrosion resistan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D163/00C09D175/14C09D5/08C09D7/61B05D7/16B05D1/38B05D1/02
CPCC09D175/04C09D163/00C09D175/14C09D5/08C09D7/61B05D7/16B05D7/544B05D7/546B05D1/02C08K2003/3045C08K2003/262C08K2003/3009B05D2202/00C08K3/34C08K3/28C08K3/26C08K3/16C08K3/30C08K3/042
Inventor 孙理理雷辉李俊峰刘凤娟李颖贺晨罗正平王萌赵立波姜舟吴明泉
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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