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Method for preparing super-hydrophobic plated layer on surface of magnesium alloy

A magnesium alloy and super-hydrophobic technology, which is applied in the direction of superimposed layer plating, metal material coating process, coating, etc., can solve the problem that the fragility of rough surface is difficult to meet the requirements of material surface performance, it is not easy to mass-produce, and the environment human body Harmful and other problems, achieve the effect of inhibiting corrosion reaction, good mechanical durability, and low raw material cost

Inactive Publication Date: 2013-03-27
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, there have been reports on the preparation of superhydrophobic surfaces on magnesium alloys at home and abroad, but in these preparation processes, most of the equipment used is relatively expensive, the process is more complicated and time-consuming, and it is not easy to produce on a large scale; and the use of expensive fluorine-containing Silane as a modifier to reduce surface energy, which is harmful to the environment as well as the human body
Although it is possible to obtain a surface with good superhydrophobic properties, it is difficult to meet people's requirements for the surface properties of materials due to the fragility of rough surfaces or the construction of rough surfaces.

Method used

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  • Method for preparing super-hydrophobic plated layer on surface of magnesium alloy
  • Method for preparing super-hydrophobic plated layer on surface of magnesium alloy
  • Method for preparing super-hydrophobic plated layer on surface of magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The material is AZ91 D magnesium alloy, the specific operation steps are as follows:

[0042] (1) Pretreatment

[0043] 1) Mechanical grinding Use 150, 400, 800 and 1500 mesh SiC sandpaper to polish the magnesium alloy substrate in sequence to remove surface oxides, burrs and dirt, etc., and rinse with water after completion.

[0044] 2) Soak the magnesium alloy sample after ultrasonic degreasing and polishing in acetone solution, and ultrasonically clean it for 5-7min at room temperature.

[0045] 3) Alkaline washing and degreasing

[0046] Alkali lotion formula and operating conditions are: Na 2 CO 3 20g·L -1 , NaOH 10g·L -1 , sodium lauryl sulfate 0.5g L -1 , temperature 75°C, time 5min.

[0047] (2) pickling and activation

[0048] Pickling-activation is used to complete the process once, and the specific formula and operating conditions are as follows: ethanol (99.7%) 50mL L -1 , acetic acid (99.3%) 20mL·L -1 , phosphoric acid (85.0%) 20mL·L -1 , nitric...

Embodiment 2

[0065] Example 2 is made of AZ91 D magnesium alloy, and the concentration of stearic acid (stearic acid) in the modification step is 0.0035 mol L -1 , and all the other steps are the same as in Example 1. In this embodiment, the superhydrophobic coating has a contact angle of 156° and a rolling angle of less than 10°. The parameter obtained by fitting the potentiodynamic polarization curve of the sample with superhydrophobic coating is the self-corrosion potential E corr =-333 mV, corrosion current density i corr =5.4×10 -8 A·cm -2 , the corrosion rate is 4.8×10 -4 mm·a -1 . In addition, the samples with super-hydrophobic coatings were subjected to 0.5 cm·s -1 After sliding at a speed of 68 cm, the contact angle dropped to 150°, indicating that the superhydrophobic coating has good mechanical durability.

Embodiment 3

[0067] The material is AZ91 D magnesium alloy, and the modification step uses dodecanoic acid (lauric acid) at a concentration of 0.01mol L -1 . All the other steps are the same as in Example 1. In this embodiment, the contact angle of the superhydrophobic coating is greater than 150°, and the rolling angle is less than 10°. The parameter obtained by fitting the potentiodynamic polarization curve of the sample with superhydrophobic coating is the self-corrosion potential E corr =-334mV, corrosion current density i corr =5.6×10 -8 A·cm -2 , the corrosion rate is 5.1×10 -4 mm·a -1 . In addition, the samples with super-hydrophobic coatings were subjected to 0.5 cm·s -1 After sliding at a speed of 69cm, the contact angle dropped to 150°, indicating that the coating has good mechanical durability.

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Abstract

The invention provides a method for preparing a super-hydrophobic plated layer on the surface of magnesium alloy. The method comprises the steps of chemical nickel-plating, preparation of a micro / nano composite structure through electro-deposition, modification and the like. The method is characterized in that a nickel coated layer is adopted in the electro-deposition. According to the invention, a preparation process which is simple and easy to implement and raw materials with low cost are used; with the help of the advantages of the super-hydrophobic surface, the super-hydrophobic plated layer is prepared on the surface of the magnesium alloy; and the prepared super-hydrophobic plated layer has good mechanical durability, long-term stability and self-cleaning effect.

Description

technical field [0001] The invention relates to the field of surface modification of metal materials, in particular to a process for preparing a superhydrophobic coating on the surface of a magnesium alloy. Background technique [0002] The density of magnesium alloy is about 1.3-1.9 g cm -3 , 30-50% lighter than aluminum alloy, more than 70% lighter than steel, and has high specific strength and specific stiffness, easy processing and other advantages, so it has a wide application prospect. Magnesium alloys are known as "green engineering materials in the 21st century" for their high specific heat performance, good forming processability and easy machining. At the same time, magnesium alloy has the characteristics of good electromagnetic shielding, good shock resistance and damping performance, good dent resistance and excellent environmental protection performance, and is widely used in automobile manufacturing, 3C industry and aerospace fields. At present, with the inte...

Claims

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Application Information

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IPC IPC(8): C23C28/02C23C18/36C23C18/18C25D3/12
Inventor 李青佘祖新王忠维陈福南李龙芹
Owner SOUTHWEST UNIVERSITY
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