Method for preparing superhydrophobic coating by adopting supersonic electric arc spaying technique

A supersonic arc and super-hydrophobic coating technology, which is applied in the coating, metal material coating process, melt spraying, etc., can solve the problems of unfavorable industrial production and practical application, complicated operation process, and difficulty in large-scale preparation. Achieve good self-cleaning performance, simple process, and good results

Active Publication Date: 2015-04-01

NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI

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AI-Extracted Technical Summary

Problems solved by technology

Although, in terms of wettability, the above methods can effectively prepare superhydrophobic surfaces, but these existing methods also have their own shortcomings and limitations, such as complicated and difficult to control the operation process, difficult to prepare on...

Abstract

The invention discloses a method for preparing a superhydrophobic coating by adopting a supersonic electric arc spaying process. The method comprises the following steps of: firstly, roughening the surface of a substrate; then preparing a coating on the surface of the substrate by adopting a supersonic electric arc spaying technique; and finally, modifying the surface of the coating with a substance with low surface energy, and drying to form a superhydrophobic surface. The method disclosed by the invention has the advantages of easy operation, low cost and good repeatability and is suitable for industrial production. In addition, the method can be used for preparing superhydrophobic coatings on a variety of surfaces such as metal surfaces, glass surfaces and tile surfaces, thus the scope of application of the superhydrophobic coating can be broadened, and large-scale production with high market value can be archived.

Application Domain

Molten spray coating

Technology Topic

Surface energyElectric arc +5

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Examples

Experimental program(3)

Example Embodiment

[0040] Example 1:

[0041] In this embodiment, the base material is 316 stainless steel or glass, and the coating is well combined with the base material. The specific preparation method of the super-hydrophobic coating is as follows:

[0042] 1. For 316 stainless steel and glass, 60 mesh brown corundum sand is used for surface sandblasting. The air pressure for sandblasting is 0.5MPa and 0.3MPa respectively, so that the roughness meets the spraying requirements;

[0043] 2. Using the supersonic arc spraying method, using aluminum wire as the spraying material, an aluminum coating with a thickness of about 150 microns is formed on the surface of the substrate. Among them, the spraying parameters for controlling supersonic arc spraying are: current 100A, voltage 25V, compressed air pressure is 0.5MPa, spraying distance is 150mm, and supersonic arc gun moving speed is 20mm/s.

[0044] 3. The coating is sprayed and modified with a mass concentration of 1% polyurethane, and the super-hydrophobic coating can be obtained by drying at 100°C for 2 hours. The contact angle is 151±3 degrees, and the rolling angle is 6.5±1 degrees.

Example Embodiment

[0045] Example 2:

[0046] In this embodiment, the base material is AZ91D magnesium alloy, TC4 titanium alloy or aluminum alloy, and the coating is well combined with the base material. The specific preparation method of the super-hydrophobic coating is as follows:

[0047] 1. For AZ91D magnesium alloy, TC4 titanium alloy and aluminum alloy, 60 mesh brown corundum sand is used for surface sandblasting. The air pressure used for sandblasting is 0.5MPa, so that the roughness meets the spraying requirements;

[0048] 2. Using the supersonic arc spraying method, using copper wire as the spraying material, a copper coating with a thickness of about 200 microns is formed on the surface of the substrate. Among them, the spraying parameters for controlling supersonic arc spraying are: current 120A, voltage 25V, compressed air pressure is 0.5MPa, spraying distance is 150mm, and supersonic arc gun moving speed is 20mm/s.

[0049] 3. The coating is sprayed and modified with a mass concentration of 5% polytetrafluoroethylene, and the super-hydrophobic coating can be obtained after drying at 250°C for 2 hours, with a contact angle of 150±2 degrees and a rolling angle of 7.5±1 degrees.

Example Embodiment

[0050] Example 3:

[0051] In this embodiment, the base material is copper sheet or ceramic tile, and the coating is well combined with the base material. The specific preparation method of the super-hydrophobic coating is as follows:

[0052] 1. Use 60 mesh brown corundum sand to roughen the surface of copper sheets and ceramic tiles. The air pressure used for sandblasting is 0.5MPa and 0.3MPa respectively, so that the roughness meets the spraying requirements;

[0053] 2. Using the supersonic arc spraying method, using zinc wire as the spraying material, a zinc coating with a thickness of about 250 microns is formed on the surface of the substrate. Among them, the spraying parameters for controlling supersonic arc spraying are: current 80A, voltage 20V, compressed air pressure is 0.5MPa, spraying distance is 150mm, and supersonic arc gun moving speed is 20mm/s.

[0054] 3. The coating is sprayed and modified with a mass concentration of 7% polytetrafluoroethylene, and the super-hydrophobic coating can be obtained by drying at 250°C for 2 hours, with a contact angle of 153±2 degrees and a rolling angle of 6.5±1 degrees.

PUM

Property	Measurement	Unit
Thickness	150.0	µm
Thickness	250.0	µm

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Simple process
Improve efficiency

Method for preparing superhydrophobic coating by adopting supersonic electric arc spaying technique

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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