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Method for constructing super-hydrophobic corrosion-resistant conversion film on surface of magnesium-lithium alloy and magnesium-lithium alloy with super-hydrophobic corrosion resistance

A magnesium-lithium alloy and super-hydrophobic technology, applied in the coating process of metal materials, etc., can solve the problems of high price, environmental pollution, unfavorable promotion, etc., and achieve the goal of improving corrosion resistance, good corrosion resistance, and reducing contact area Effect

Active Publication Date: 2019-12-20
HOHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods for preparing superhydrophobic surfaces often involve low surface energy substances that are expensive and pollute the environment, which is not conducive to large-scale promotion

Method used

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  • Method for constructing super-hydrophobic corrosion-resistant conversion film on surface of magnesium-lithium alloy and magnesium-lithium alloy with super-hydrophobic corrosion resistance
  • Method for constructing super-hydrophobic corrosion-resistant conversion film on surface of magnesium-lithium alloy and magnesium-lithium alloy with super-hydrophobic corrosion resistance
  • Method for constructing super-hydrophobic corrosion-resistant conversion film on surface of magnesium-lithium alloy and magnesium-lithium alloy with super-hydrophobic corrosion resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Process the Mg-9Li alloy into a 10mm×10mm×2mm cube, inlay it with epoxy resin, then polish it with 400, 600, 800, 1000, 1500 mesh sandpaper in turn, and then use 0.05μm alumina polishing powder to suspend The solution was mechanically polished, and finally ultrasonically cleaned with alcohol and acetone for 10 minutes respectively, and dried. Add stearic acid to 50mL of ethanol, add an equal volume of distilled water and stir at the same time to obtain a mixed solution (the concentration of magnesium stearate in the mixed solution is 0.01M); use a graduated cylinder to measure 70mL of the mixed solution and place it in a 100mL reaction In the kettle, put the processed samples into the reaction kettle, then place the reaction kettle in the electric furnace, keep it at 110°C for 2 hours, and finally, cool it to room temperature with the furnace, take it out and dry it.

[0041] Observation by scanning electron microscopy reveals that a conversion film has been constructed...

Embodiment 2

[0044] Process the Mg-9Li alloy into a 10mm×10mm×2mm cube, inlay it with epoxy resin, then polish it with 400, 600, 800, 1000, 1500 mesh sandpaper in turn, and then use 0.05μm alumina polishing powder to suspend The solution was mechanically polished, and finally ultrasonically cleaned with alcohol and acetone for 10 minutes respectively, and dried. Add stearic acid in 50mL ethanol, add distilled water of equal volume and stir simultaneously, obtain mixed liquor (the concentration of magnesium stearate in the mixed liquor is 0.01M); In a 100mL reactor, put the treated sample into the reactor, then place the reactor in an electric furnace, keep it at 130°C for 2 hours, and finally, cool it to room temperature with the furnace, take it out and dry it.

[0045] Observation by scanning electron microscopy shows that a conversion film is formed on the surface of the magnesium-lithium alloy. The conversion film is composed of a spherical substructure and a sheet-like substructure. ...

Embodiment 3

[0047] The difference from Example 2 is that the temperature of the hydrothermal reaction is 120°C.

[0048] Observation by scanning electron microscopy shows that a conversion film is formed on the surface of the magnesium-lithium alloy. The conversion film is composed of a spherical substructure and a sheet-like substructure. The angle is 151°. Through electrochemical tests, the AC impedance of the magnesium-lithium alloy with a superhydrophobic conversion film is 5100 ohm cm 2 (Such as Figure 4 shown).

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Abstract

The invention relates to the technical field of magnesium-lithium alloy surface corrosion resistance, in particular to a method for constructing a super-hydrophobic corrosion-resistant conversion filmon the surface of magnesium-lithium alloy and the magnesium-lithium alloy with super-hydrophobic corrosion resistance. The method for constructing the super-hydrophobic corrosion-resistant conversionfilm on the surface of the magnesium-lithium alloy comprises the following steps that a mixed solution comprising stearic acid, ethanol and water is mixed with the magnesium-lithium alloy, and afterhydrothermal reaction, the super-hydrophobic corrosion-resistant conversion film is formed on the surface of the magnesium-lithium alloy. Compared with existing films commonly prepared through a sol-gel method, an etching method and a soaking method, the super-hydrophobic corrosion-resistant film constructed through a hydrothermal method has the advantages of being simple and environmentally friendly. The super-hydrophobic film can reduce the contact area of corrosion liquid and a matrix, so that the corrosion resistance of the magnesium-lithium alloy can be effectively improved while the surface of the magnesium-lithium alloy is super-hydrophobic.

Description

technical field [0001] The invention relates to the technical field of magnesium-lithium alloy surface anticorrosion technology, in particular to a method for constructing a superhydrophobic corrosion-resistant conversion film on the surface of a magnesium-lithium alloy and a magnesium-lithium alloy with superhydrophobic corrosion-resistant performance. Background technique [0002] Magnesium-lithium alloy is the lightest alloy material so far. It not only has the advantages of magnesium alloy, but also has its own outstanding features: high specific strength and specific modulus, good shock absorption and resistance to high-energy particle penetration, relatively Good low temperature impact resistance, and high plasticity at low temperature, easy to roll into thin plate and extrude into shaped materials. Magnesium-lithium alloys are ideal materials for lightweight components and have broad application prospects in aerospace, automotive, electronics, and military fields. Ho...

Claims

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Application Information

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IPC IPC(8): C23C22/57
CPCC23C22/57
Inventor 宋丹王国威禚孝儒江静华马爱斌邱超李玉华
Owner HOHAI UNIV
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