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A surface treatment method for anti-frost

A surface treatment and anti-frosting technology, which is applied in the direction of surface reaction electrolytic coating, coating, electrolytic coating, etc., can solve the problems of ineffective frosting and poor frosting resistance, achieve excellent anti-frost effect, improve Persistence, anti-frost performance Long-lasting and effective effect

Active Publication Date: 2020-07-10
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has poor frost resistance and only has a certain effect on the initial frost formation. The machine will still produce frost after long-term operation. After frost formation, it still needs to be defrosted, which cannot effectively solve the frost formation problem.

Method used

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  • A surface treatment method for anti-frost
  • A surface treatment method for anti-frost
  • A surface treatment method for anti-frost

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] The preparation method provided by the present invention firstly performs anodic oxidation treatment on the workpiece to form a special micro-nano structure on the surface of the workpiece, and then performs surface modification on the workpiece to further modify the micro-nano structure, adjust the free energy of the workpiece surface, and form a special surface on the workpiece surface On the one hand, the surface of the workpiece has a high contact angle and extremely low adhesion, so that the solution is easy to fall off from the hydrophobic surface; The workpiece has excellent anti-frost effect, and the anti-frost performance is durable and effective.

[0035] In the present invention, before performing the above step a), it is preferable to perform surface cleaning and electrochemical polishing in sequence on the workpiece to be treated.

[0036] In the present invention, the surface cleaning preferably includes detergent cleaning and corrosive solution corrosion....

Embodiment 1

[0056] 1.1 Sample processing

[0057] After ultrasonically cleaning the grease stains on the surface of aluminum fins with acetone, corrode them with 1mol / L NaOH solution for 5 minutes to remove the natural oxide film; put the cleaned aluminum fins into anhydrous ethanol and perchloric acid with a volume ratio of 9:1 In the composed polishing solution, at a voltage of 20V, a current of 0.3A / cm 2 , electrochemical polishing at room temperature for 1 to 2 minutes; put the polished aluminum fins into 0.3mol / L oxalic acid solution for anodic oxidation, the treatment temperature is 0°C, and the current density is 0.10A / cm 2 , the treatment time is 15 minutes; the treated aluminum fins are immersed in 1% lauric acid absolute ethanol solution, taken out after 30 minutes, and dried in a dryer at 120°C for 30 minutes to obtain anti-frosting Aluminum fins.

[0058] 1.2 Characterization and testing

[0059] The surface structure of the obtained aluminum fins was observed by scanning e...

Embodiment 2

[0063] 1.1 Sample processing

[0064] After ultrasonically cleaning the grease stains on the surface of aluminum fins with acetone, corrode them with 1mol / L NaOH solution for 5 minutes to remove the natural oxide film; put the cleaned aluminum fins into anhydrous ethanol and perchloric acid with a volume ratio of 9:1 In the composed polishing solution, at a voltage of 15V, a current of 0.1A / cm 2 , electrochemical polishing at room temperature for 1 to 2 minutes; put the polished aluminum fins into 0.5mol / L oxalic acid solution for anodic oxidation, the treatment temperature is 5°C, and the current density is 0.20A / cm 2 , the treatment time is 10 minutes; the treated aluminum fins are immersed in lauric acid absolute ethanol solution with a mass fraction of 1%, taken out after 30 minutes, and dried in a dryer at a temperature of 120°C for 30 minutes to obtain anti-frosting Aluminum fins.

[0065] 1.2 Characterization and testing

[0066] Observing the surface structure of th...

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Abstract

The invention provides a surface treatment method for resisting frosting. The method comprises the following steps that (a) a water solution of oxalic acid serves as electrolyte, and a to-be-treated workpiece is subjected to anodic oxidation treatment at the current density of 0.1-0.4A / cm<2>; (b) the workpiece subjected to anodic oxidation treatment is subjected to surface modification treatment,and an anti-frosting workpiece is obtained; and a modifier adopted in the surface modification treatment process is one or more of lauric acid, fluorosilane, siloxane, a silane coupling agent and higher fatty acid. The method firstly conducts anodic oxidation treatment on the workpiece, so that a special micro-nano structure is formed on the surface of the workpiece, then conducts surface modification on the workpiece to further modify the micro-nano structure and adjust the free energy on the surface of the workpiece, therefore a special surface is formed on the surface of the workpiece, accordingly the workpiece has the excellent anti-frosting effect, and the anti-frosting property is long-lasting and effective.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to an anti-frost surface treatment method. Background technique [0002] Frosting is a natural phenomenon that can be seen everywhere in daily life. When the temperature of the surface of an object is lower than the dew point temperature of water vapor in the air, water vapor will condense on the surface of the object. Dew will undergo phase change freezing. When the surface temperature of the object continues to drop, frost will form on the frozen ice particles, and then form a frost layer. In the field of air conditioners and other electrical appliances, frosting often occurs. For example, when the air conditioner is heating, the insufficient heat dissipation of the evaporator of the indoor unit will cause the local temperature of the evaporator to be too low, resulting in frosting; when the air conditioner is cooling, the outdoor unit needs to absorb heat, and the evapo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/10C25D11/24C25D11/16
CPCC25D11/10C25D11/16C25D11/24
Inventor 张艳梅杨立陈玲揭晓华
Owner GUANGDONG UNIV OF TECH
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