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A kind of preparation method of superhydrophobic magnesium alloy coating

A magnesium alloy and super-hydrophobic technology is applied in the preparation of corrosion resistance, super-hydrophobic magnesium alloy coating, and the preparation of coatings that increase super-hydrophobicity, and can solve the problem of affecting the bonding force between the interface between the aluminum coating and the magnesium substrate, and the density of the aluminum coating. It can solve the problems of poor performance and failure of magnesium alloy components, so as to achieve the effect of improving light weight, strong catalytic activity and improving corrosion resistance.

Active Publication Date: 2019-02-01
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the result of the pretreatment of the magnesium alloy will affect the interface bonding force between the aluminum coating and the magnesium substrate, which will easily cause the aluminum coating to fall off, or the compactness of the aluminum coating is not good, and the magnesium alloy substrate will quickly collapse under the action of the corrosive medium. spreading, leading to the failure of magnesium alloy components, it is necessary to prepare high-performance coatings with self-healing function

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] AZ91D magnesium alloy is selected, the formula of the ionic solution is 1-butyl-3-methylimidazolium tetrafluoroborate, the molar ratio of anhydrous aluminum trichloride and diluent is 1:2:5, and the preparation process is as follows:

[0021] 1) Pretreatment: Polish the surface of magnesium alloy with 200~2000# sandpaper or grinder, ultrasonic cleaning and degreasing, pickling treatment, pickling formula: HNO 3 35ml / L, H 3 PO 4 30ml / L, to remove residues such as oxide film on the surface;

[0022] 2) Low fluorine activation: activation formula: NH 4 h 2 PO 4 85g / L, NH 4 F 30g / L. The fluorine-containing activation solution can further remove the oxidation products on the surface of the magnesium alloy, and can form an insoluble film on the surface. Immerse the pre-treated magnesium alloy in the activation solution for 4 minutes, perform activation treatment, wash and dry;

[0023] 3) Electrodeposited aluminum coating from ionic solution: preparation of AlCl 3...

Embodiment 2

[0027] AZ91D magnesium alloy is selected, the formula of the ionic solution is 1-butyl-3-methylimidazolium tetrafluoroborate, the molar ratio of anhydrous aluminum trichloride and diluent is 1:2:4, and the preparation process is as follows:

[0028] 1) Pretreatment: Polish the surface of magnesium alloy with 200~2000# sandpaper or grinder, ultrasonic cleaning and degreasing, pickling treatment, pickling formula: HNO 3 40ml / L, H 3 PO 4 20ml / L, to remove residues such as oxide film on the surface;

[0029] 2) Low fluorine activation: activation formula: NH 4 h 2 PO 4 90g / L, NH 4 F 25g / L. The fluorine-containing activation solution can further remove the oxidation products on the surface of the magnesium alloy, and can form an insoluble film on the surface. Immerse the magnesium alloy that has been pretreated in the activation solution for 6 minutes, perform activation treatment, wash and dry;

[0030] 3) Electrodeposition of aluminum coating from ionic solution, prepa...

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Abstract

The invention discloses a preparation method of a super-hydrophobic magnesium alloy coating. The preparation method comprises the following steps: magnesium alloy is taken as a substrate, an aluminum film with a thickness of 10-50 microns is prepared on the surface of the magnesium alloy after the surface is subjected to pretreatment, low fluorine activation and ion solution electro-deposition treatment, and then, nano SiO2 particles with a diameter of 5-50 nm is coated on the surface of the aluminum film by adopting the pulling method. A layer of activation film can be formed on the surface of the magnesium alloy substrate through adopting pretreatment acid pickling and low fluorine activation to effectively improve the corrosion resistance of the substrate in solution, and the pH value of acid pickling activation solution is controlled to be in the range of 3.5-5. The surface corrosion resistance and abrasion resistance of the magnesium alloy after treatment are improved by 2-4 times and 3-5 times respectively. The invention belongs to the fields of surface technology and material preparation and the result can be widely applied to the fields of electronic industry, automobile industry and civil use.

Description

technical field [0001] The invention relates to a method for preparing a superhydrophobic magnesium alloy coating, which belongs to the fields of surface technology and material preparation. Specifically, it is a coating preparation method that can improve the corrosion resistance of the magnesium alloy and increase the superhydrophobicity. Background technique [0002] Magnesium has the lowest density among all structural metals and their alloy materials, and has many performance advantages, such as: high specific strength, high specific stiffness, large elastic modulus, density close to human bone, excellent processing performance, vibration damping , electromagnetic shielding and radiation resistance are good, easy to recycle, large reserves in nature, etc. Magnesium and its alloys are known as the model of "new materials in the 21st century", and have extremely important application value and prospects in the fields of automobiles, electrical appliances, transportation,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/66C25D5/42B05D7/14
CPCB05D7/14C25D3/665C25D5/42
Inventor 储成林赵莉李旋
Owner SOUTHEAST UNIV
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