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Preparation method for superamphiphobic surface of aluminum and alloy thereof

A technology of super-amphiphobic surface and aluminum alloy sheet, which is applied in metal material coating process, liquid chemical plating, coating, etc. It can solve the problems of inability to realize large-area preparation, large anodic oxidation current, and harsh process conditions. Achieve the effects of environmental protection, good antifouling performance and drag reduction performance, and simple preparation method

Inactive Publication Date: 2013-09-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process conditions of the above method are relatively harsh and require a large anodizing current. During the second anodizing, low-temperature cooling equipment is required, which cannot realize large-area preparation; at the same time, strong or weak acids are required during anodizing, which is harmful to the environment. will cause some pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Use 800-grit sandpaper to evenly polish a 6cm×2cm rectangular aluminum sheet, and then use 1700-grit sandpaper to evenly polish it. Ultrasonic cleaning with acetone and ethanol solutions for 10 minutes respectively, and cleaning with deionized water, electrochemically etching the treated aluminum sheet in 0.08M NaCl solution, using graphite or aluminum sheet as cathode, DC voltage 10V, temperature to room temperature and reacted for 2 hours. After the aluminum sheet was taken out, it was ultrasonically cleaned in deionized water for 5 minutes to remove the aluminum oxide particles attached to the surface.

[0031] Then put the aluminum or aluminum alloy sheet at an angle of 60° into a sealed bottle filled with a mixed solution of zinc nitrate (zinc nitrate hexahydrate) and hexamethylenetetramine at a concentration of 0.05M, 50mL, and keep the water at a constant temperature of 90°C. Thermal synthesis, take out the aluminum or aluminum alloy sheet after 3 hours, replace...

Embodiment 2

[0034] A 6cm×2cm rectangular aluminum sheet was evenly sanded with 800-grit sandpaper, and then evenly sanded with 1700-grit sandpaper. Ultrasonic cleaning with acetone and ethanol solutions for 10 minutes respectively, and cleaning with deionized water, the processed aluminum sheet was cleaned in 0.02M Na 2 SO 4 Electrochemical etching in solution, using graphite or aluminum plate as cathode, direct voltage 8V, temperature at room temperature, and reacting for 2.5 hours. After the aluminum sheet was taken out, it was ultrasonically cleaned in deionized water for 5 minutes to remove the aluminum oxide particles attached to the surface.

[0035]Then put the aluminum or aluminum alloy sheet at an angle of 70° into a sealed bottle filled with a mixed solution of zinc nitrate (zinc nitrate hexahydrate) and hexatetramine with a concentration of 0.025M and 50mL. Thermal synthesis, take out the aluminum or aluminum alloy sheet after 3 hours, replace the reaction solution, put the a...

Embodiment 3

[0038] Use 800-grit sandpaper to evenly polish a 6cm×2cm rectangular aluminum sheet, and then use 1700-grit sandpaper to evenly polish it. Ultrasonic cleaning with acetone and ethanol solutions for 10 minutes respectively, and cleaning with deionized water, electrochemically etching the treated aluminum sheet in 0.15M NaCl solution, using graphite or aluminum sheet as cathode, DC voltage 5V, temperature to room temperature and reacted for 3 hours. After the aluminum sheet was taken out, it was ultrasonically cleaned in deionized water for 5 minutes to remove the aluminum oxide particles attached to the surface.

[0039] Then put the aluminum or aluminum alloy sheet into a sealed bottle containing a mixed solution of zinc nitrate (zinc nitrate hexahydrate) and hexamethylenetetramine with a concentration of 0.02M and 50mL at an angle of 60-70°, and keep the temperature at 90°C. ℃ hydrothermal synthesis, take out the aluminum or aluminum alloy sheet after 3 hours, replace the re...

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PUM

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Abstract

The present invention relates to a preparation method for a superamphiphobic surface of aluminum and an alloy thereof. According to the present invention, a two-step method is adopted to prepare a superhydrophobic surface, and a low surface energy material is adopted to modify the hydrophobic surface, wherein an electrochemical etching method is adopted to prepare an aluminum micron-scale rough surface, then a hydrothermal synthesis method is adopted to synthesize a zinc oxide micro-nano double rough structure, and the prepared superhydrophobic surface provides a contact angle of more than 156 DEG for water, and provides an oleophobic angle of more than 150 DEG C for lubricating oil; and the method has the following characteristics that: simpleness and practicality are provided, equipment requirements are low, the used electrochemical etching technology and the used hydrothermal synthesis technology are mature, the large-area superamphiphobic surface is easily prepared, and industrial manufacturing is easily achieved.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment and modification thereof, and in particular relates to a method for preparing a superamphiphobic surface of aluminum and its alloys. Background technique [0002] Wettability is an important interfacial phenomenon on solid surfaces, and the degree of surface wetting depends on its chemical composition, microscopic morphology and geometric structure. There are two main factors affecting the wettability of solid surfaces: (1) surface free energy; (2) surface roughness. When the surface free energy is reduced, its hydrophobic properties are enhanced. However, even a smooth surface with the lowest surface energy has a contact angle of only 119° with water. In order to get a better hydrophobic effect, the surface needs to have a certain roughness. A surface that is both hydrophobic and oleophobic is an amphobic surface, and a surface that has a contact angle with both water and oil g...

Claims

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Application Information

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IPC IPC(8): C23F17/00C25F3/04C23C18/16
Inventor 张海峰刘晓为王锋张晓舒汪洋
Owner HARBIN INST OF TECH
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