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Preparation method of bionic hydrophobic coating on surface of magnesium alloy

A water-based coating, magnesium alloy technology, applied in the direction of metal material coating process, coating, liquid chemical plating, etc., can solve the problems of restricting the use of magnesium alloys, the lack of protection of the substrate, and poor corrosion resistance, so as to reduce contact Enhancement of area, water repellency, and improvement of corrosion resistance

Active Publication Date: 2011-02-02
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, magnesium alloy is an extremely active metal, which is easily oxidized in the air and forms a loose oxide film. This oxide film has no protective effect on the substrate, so its corrosion resistance is poor, which restricts the use of magnesium alloys.

Method used

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  • Preparation method of bionic hydrophobic coating on surface of magnesium alloy
  • Preparation method of bionic hydrophobic coating on surface of magnesium alloy
  • Preparation method of bionic hydrophobic coating on surface of magnesium alloy

Examples

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preparation example Construction

[0031] The preparation method of the biomimetic hydrophobic coating on the surface of magnesium alloy is carried out according to the following specific steps:

[0032] Step 1, pretreatment of the magnesium alloy sample: first, the magnesium alloy sample is soaked in an alkaline cleaning solution heated in a water bath and cleaned by ultrasonic vibration to remove the grease on the surface of the sample, wherein the cleaning time is 40 minutes, The composition of the alkaline washing solution is: NaOH: 45g / l, Na 3 PO 4 12H 2 O: 10g / l; then, soak the magnesium alloy sample after alkali washing in pickling solution at room temperature to remove oxides and other metal dirt on the surface of the sample. The composition of the lotion is: CrO 3 : 125g / L, HNO 3 : 110ml / l;

[0033] Step 2, chemical etching: immerse the pretreated magnesium alloy sample in a chemical etching solution, so that the morphology and characteristics of the sample surface are changed, and the surface con...

Embodiment 1

[0037] Taking the magnesium alloy AZ91D as the research object, the magnesium alloy is processed into a sample of 10mm×10mm×5mm, and 1000 # , 1500 # and 2000 # Polish the surface of the sample with metallographic sandpaper, and then use 1.5 # Diamond abrasive paste was used to polish the sample surface.

[0038] Soak the magnesium alloy sample in an alkaline cleaning solution with a water bath temperature of 60°C and clean it with ultrasonic vibration to remove the grease on the surface of the sample. The cleaning time is 40 minutes, and the composition of the alkaline cleaning solution is: NaOH: 45g / l, Na 3 PO 4 12H 2 O: 10g / l; then, soak the magnesium alloy sample after alkali washing in pickling solution at room temperature to remove oxides and other metal dirt on the surface of the sample. The composition of the lotion is: CrO 3 : 125g / L, HNO 3 : 110ml / l.

[0039] Immerse the pretreated magnesium alloy sample in the chemical etching solution to change the morphol...

Embodiment 2

[0043] Embodiment 2, embodiment 3 remove the nitrate solution AgNO that carries out chemical etching 3 Concentrations were 10mmol / l and 50mmol / l, soaking time were 60s and 10s, respectively, and the same process flow as in Example 1 was adopted except that the above parameters were changed. The sample was observed and measured by a scanning electron microscope and a wetting angle measuring instrument. The results showed that when the sample was chemically etched, due to the nitrate solution AgNO 3 With different concentrations, the biomimetic hydrophobic coating formed on the surface has significant differences in surface characteristics (see Figure 5 , Image 6 , Figure 7 ), and there are obvious regular changes in the hydrophobic properties (see Figure 8 ).

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Abstract

The invention relates to a metal material surface modification technology, in particular to a preparation method of a bionic hydrophobic coating on the surface of a magnesium alloy, which aims at improving the surface hydrophobicity of a coating and further improving the corrosion resistance. The method comprises the following steps: carrying out pretreatment by alkali wash and acid wash, and then immersing a sample in a chemical etching solution to change the appearance characteristics of the surface of the sample and enable the surface to contain chemical element substances different from the matrix; and after the reaction, placing the magnesium alloy sample subjected to chemical etching in a chemical plating solution with nickel sulfate as a main salt. Thus, because of the coupling effect of different structure and foreign substance, the adsorptive deposition position and distribution of metal cations in the chemical plating solution are changed, and a chemical coating having typical biologic hydrophobic surface characteristics can be gradually formed in the deposition process.

Description

Technical field: [0001] The invention relates to a metal material surface modification technology, in particular to a preparation method of a magnesium alloy surface coupling biomimetic hydrophobic coating. Background technique: [0002] A large number of biological surfaces in nature have formed a natural and reasonable hydrophobic structure after hundreds of millions of years of natural selection and evolution. The microstructure of natural biological surfaces such as lotus leaves and reeds is very fine, and its hydrophobic performance is far superior to that of ordinary material surfaces. The papillae-like microstructure on the surface of the lotus leaf makes it more hydrophobic than other surfaces, which is the famous "lotus leaf effect". [0003] Magnesium alloy is the lightest metal structural material in practical application. In recent years, the industrialization of magnesium alloy has developed rapidly, and it has been dubbed the titles of "metal of the times" an...

Claims

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Application Information

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IPC IPC(8): C23C18/18C23C18/36C23F1/22
Inventor 刘燕李亮卢国龙韩志武任露泉于思荣
Owner JILIN UNIV
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