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Preparation method of surface coating of magnesium alloy substrate

A technology of substrate surface and magnesium alloy, which is applied in the direction of surface coating liquid device, coating, pretreatment surface, etc., can solve the problem of the reduction of oxidation resistance of oxide film coating, the influence of coating on the aesthetics and decoration of magnesium alloy, Coating dusting and other problems, to achieve the effect of improving the bonding strength, uniform friction, and preventing corrosion

Inactive Publication Date: 2015-03-11
LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the traditional process of preparing magnesium alloy surface coating is to carry out chemical oxidation treatment on the magnesium alloy parts after processing to form an oxide film on the surface, but the quality of the oxide film coating formed by this method is usually affected by the casting quality. At the same time, due to the influence of time and surrounding air quality, the coating will appear dusty, which will reduce the oxidation resistance of the oxide film coating. , wind and sand environment, and even some oxide film coatings fall off directly in less than one year of use, and the peeling off of the coating affects the beautiful decoration of magnesium alloys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 In this example, the surface of the magnesium alloy substrate has pores

[0029] The preparation method of the surface coating of the magnesium alloy substrate in this embodiment, the specific operation steps are:

[0030] 1) Solvent cleaning: prepare a solvent, mix 0# aviation gasoline and absolute ethanol according to the weight ratio of 100:80, and clean the magnesium alloy workpiece to be treated in an ultrasonic device for 2 minutes;

[0031] 2) Drying: Dry in an oven at 70°C for 35 minutes;

[0032] 3) Cooling: Cool to room temperature under natural conditions;

[0033] 4) Spraying the primer: control the spraying pressure of the primer spray gun to 2.0 bar, the spraying distance to 15cm, the spray width to 25cm, spray twice in a cross pattern, spray the acrylic polyurethane primer with a thickness of 20μm, and let it air for 60min;

[0034] 5) Spray topcoat: control the spraying air pressure of the topcoat spray gun to 2.0 bar, the spray distance to 1...

Embodiment 2

[0037] Example 2 The magnesium alloy in this example is a spongy cast magnesium alloy substrate cover plate with surface defects

[0038] The preparation method of the magnesium alloy substrate surface coating of the present embodiment, the specific operation steps are as follows:

[0039] 1) Solvent cleaning: prepare a solvent, mix 0# aviation gasoline and absolute ethanol according to the weight ratio of 100:80, use white silk cloth dipped in solvent to scrub the surface of the substrate until there is no trace of dirt on the white silk cloth;

[0040] 2) Drying: Dry in an oven at 70°C for 40 minutes;

[0041] 3) Cooling: Cool to room temperature under natural conditions;

[0042] 4) Spraying the primer: control the spraying pressure of the primer spray gun to 2.0 bar, the spraying distance to 20cm, the spray width to 25cm, spray twice in a cross pattern, spray the acrylic polyurethane primer with a thickness of 25μm, and let it air for 70min;

[0043] 5) Spray topcoat: co...

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Abstract

The invention discloses a preparation method of a surface coating of a magnesium alloy substrate and belongs to the technical field of metal surface coating. According to the method, before spraying a primer and a finishing coat, dust, impurities, moisture, chemical oxidization liquid residue and the like in the defect pores of the magnesium alloy are thoroughly discharged in such a manner of cleaning, heating and cooling until the temperature reaches a room temperature, and then the pores are closed to isolate oxidization and prevent corrosion, and therefore, the bonding strength of the coating and the substrate is further improved. The preparation method of the surface coating of the magnesium alloy substrate is simple and convenient to operate, easy to implement, suitable for cast magnesium alloy substrates of any regular and irregular shapes, and in particular suitable for surface defect cast magnesium alloys, and can be applied to preparing the protective coatings of aviation, aerospace and automobile equipment and the like.

Description

technical field [0001] The invention belongs to the technical field of metal surface coatings, and in particular relates to a method for preparing a surface coating of a magnesium alloy substrate. Background technique [0002] Due to the structural characteristics of magnesium alloy itself, its small specific gravity, high specific strength and specific stiffness, excellent shock absorption and electromagnetic shielding properties, etc., are widely used in aviation, aerospace, automotive and other fields. However, magnesium alloys have high chemical and electrochemical activity, and are easily corroded in the atmosphere, especially in humid and coastal areas. Especially for parts with defects such as shrinkage cavities and sand holes on the surface, the surface coating can play a certain protective role. Therefore, forming a coating on the surface of magnesium alloys is a common method to prevent corrosion of magnesium alloys. [0003] At present, the traditional process of...

Claims

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Application Information

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IPC IPC(8): B05D7/16B05D3/10B05D3/02
Inventor 刘红霞
Owner LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC