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A method for constructing superhydrophobic coatings on metal surfaces

A super-hydrophobic coating and metal surface technology, which is applied to the surface coating liquid device, coating, pretreatment surface, etc., can solve the problems of difficult surface treatment and complex structure of aluminum fins, and achieve low cost and engineering Ease of application and mild results

Active Publication Date: 2021-01-19
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The methods mentioned above are mostly used for sheet-like and linear-shaped aluminum materials with completely exposed surfaces, while finned heat exchangers usually consist of hundreds of aluminum sheets stacked at a distance of about 1 mm. The structure is complex and there is a physical gap between the aluminum sheets. Spatially occlude each other, so it is difficult to achieve uniform surface treatment on aluminum fins with the currently reported methods
For example: sandpaper cannot be polished to the stacked part of the aluminum sheet, the electrochemical method requires additional conductivity requirements for the fins, chemical vapor deposition cannot assemble superhydrophobic deposits on the aluminum sheet in the stacked part, etc.

Method used

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  • A method for constructing superhydrophobic coatings on metal surfaces
  • A method for constructing superhydrophobic coatings on metal surfaces
  • A method for constructing superhydrophobic coatings on metal surfaces

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Clean the aluminum fin heat exchanger (take the size of 205mm*45mm*210mm as an example) with alkaline solution at 70°C for 0.5min. 2 CO 3 and Na 3 PO 4 Added to water to prepare, and Na 2 CO 3 The concentration is 0.01mol / L, Na 3 PO 4 The concentration is 0.01mol / L, and then washed with 70°C acid solution for 2min, the acid solution is made by adding Mn(H 2 PO 4 ) 2 and HNO 3 Added to water, Mn(H 2 PO 4 ) 2 The concentration is 0.002mol / L, HNO 3 The concentration is 0.02mol / L, and then rinsed with deionized water and ethanol and dried; the aluminum fin heat exchanger is immersed in a hydrochloric acid aqueous solution with a concentration of 0.5mol / L for 15 minutes, and the etching is carried out at room temperature. The heat exchanger etched by hydrochloric acid aqueous solution was rinsed with deionized water and ethanol in turn, and then dried; the heat exchanger etched by hydrochloric acid aqueous solution was placed in a 2 mmol / L ethanol solution of st...

Embodiment 2

[0043] Clean the aluminum fin heat exchanger (take the size of 205mm*45mm*210mm as an example) with alkaline solution at 50°C for 3 minutes. 2 CO 3 Added to water to prepare, and Na 2 CO 3 The concentration is 0.01mol / L, and then washed with 50 ℃ acid solution for 2min, the acid solution is made by adding Mn(H 2 PO 4 ) 2 、H 3 PO 4 and HNO 3 Added to water, and Mn(H 2 PO 4 ) 2 The concentration is 0.001mol / L, H 3 PO 4 The concentration is 0.02mol / L, HNO 3 The concentration is 0.02mol / L, then rinse with deionized water and ethanol and dry; immerse the aluminum fin heat exchanger in a hydrochloric acid aqueous solution with a concentration of 2mol / L and etch for 5min, and the etching is carried out at room temperature. The heat exchanger etched by the aqueous solution was rinsed with deionized water and ethanol in turn, and then dried; the heat exchanger etched by the hydrochloric acid aqueous solution was placed in a 5 mmol / L ethanol solution of stearic acid, and se...

Embodiment 3

[0046] Clean the aluminum fin heat exchanger (take the size of 205mm*45mm*210mm as an example) with alkaline solution at 60°C for 3 minutes, and pass the alkaline solution through Na 3 PO 4 Added to water to prepare, and Na 3 PO 4 The concentration is 0.02mol / L, and then washed with 60 ℃ acid solution for 3min, the acid solution is made by adding Mn(H 2 PO 4 ) 2 and H 3 PO 4 Added to water, Mn(H 2 PO 4 ) 2 The concentration is 0.0015mol / L, H 3 PO 4 The concentration is 0.04mol / L, and then rinsed with deionized water and ethanol and dried; the aluminum fin heat exchanger is immersed in a hydrochloric acid aqueous solution with a concentration of 1mol / L for etching for 10min, and the etching is carried out at room temperature. The heat exchanger etched by the aqueous solution was rinsed with deionized water and ethanol in turn and then dried; In the ethanol solution of oxysilane, self-assemble at room temperature for 1 hour, rinse with deionized water after taking it...

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Abstract

The invention relates to a method for building a super-hydrophobic coating on a metal surface. The method comprises the steps that metal base materials are cleaned in a lye solution at 50-70 DEG C andan acid solution at 50-70 DEG C to remove grease on the surface; chemical etching treatment is carried out on the metal surface by using an aqueous hydrochloric acid solution at room temperature for5-15 minutes; and hydrophobic substance with low-surface-energy is assembled onto the metal surface after the chemical etching treatment, and then solidification treatment is carried out. According tothe method for building the super-hydrophobic coating on the metal surface, the super-hydrophobic coating is built on the metal surface, the used preparation method has no special restrictions on theshape of metal, and coating can be carried out on the surface of a test piece with complicated shape. The method does not require special equipment, has simple process, easy operation and mild condition, is especially suitable for metal parts with irregular shape such as heat exchanger fins, and is easy for industrialized mass production. After the gained coating is placed for a long period, preferable super-hydrophobic performance is still maintained.

Description

technical field [0001] The invention relates to a method for constructing a superhydrophobic coating on a metal surface. Background technique [0002] Metal aluminum is the most widely used non-ferrous metal structural material in the industry. Compared with common metals such as iron, copper, and steel, aluminum and its alloys have low density, light weight, excellent thermal conductivity and electrical conductivity, and good plasticity (applicable It is a metal material with excellent comprehensive properties, such as a series of excellent properties such as high specific strength and easy surface treatment. Aluminum alloys are widely used in mechanical parts, automobile manufacturing, aerospace industry, electronic communication equipment, architectural decoration, air source heat pump systems and many other industries. Taking the air source heat pump system as an example, most of the heat exchangers are aluminum products. In order to achieve good heat dissipation perfor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05D3/10C23F1/20C23F1/28C23F1/30C23G1/08C23G1/10C23G1/12C23G1/24
CPCB05D3/102C23F1/20C23F1/28C23F1/30C23G1/083C23G1/085C23G1/10C23G1/125C23G1/24
Inventor 陈美娟顾兆林王赞社
Owner XI AN JIAOTONG UNIV
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