Preparation method and application of SLIPS/LDHs composite film layer on surface of magnesium alloy

A composite film layer and magnesium alloy technology, which is applied to the device for coating liquid on the surface, metal material coating process, coating, etc., can solve the problems of complicated operation and high cost, and achieve firm combination, good universality, The effect of proactive protection intelligence

Pending Publication Date: 2021-10-29
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the disadvantages of complex operation and high cost in surface treatment and other processes also bring great problems to the treatment of magnesium alloys.

Method used

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  • Preparation method and application of SLIPS/LDHs composite film layer on surface of magnesium alloy
  • Preparation method and application of SLIPS/LDHs composite film layer on surface of magnesium alloy
  • Preparation method and application of SLIPS/LDHs composite film layer on surface of magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A method for preparing a triple self-repairing SLIPS / LDHs composite film layer on the surface of a magnesium alloy, the specific steps are:

[0045] 1. In situ growth of MgAlLa-LDHs film layer

[0046]Soak the water-milled magnesium alloy AZ31 in the above-mentioned degreased and degreased aqueous solution (sodium hydroxide 40g / L, sodium carbonate 25g / L, sodium phosphate 40g / L), keep warm in a water bath at 50°C for 60s, and then wash with 1M hydrogen Wash with an aqueous solution of sodium oxide at 60°C for 30s, and then use 400g / L nitric acid (ρ=1.42g / ml) to polish at room temperature 25°C for 1-2min. Rinse again with deionized water and dry with cold air. (Water mill: Use 150, 600, 800, 1200, 2000# sandpaper to polish the magnesium alloy substrate respectively, and use alcohol to ultrasonically clean it for 5 minutes, then dry it for later use).

[0047] Hydrothermal reaction steps: first pour the electrolyte solution into the liner of the reaction kettle, and then...

Embodiment 2

[0056] A method for preparing a triple self-repairing SLIPS / LDHs composite film layer on the surface of a magnesium alloy, the specific steps are:

[0057] 1. In situ growth of MgAlLa-LDHs film layer

[0058] Soak the water-milled magnesium alloy AZ31 in the above-mentioned degreased and degreased aqueous solution (sodium hydroxide 40g / L, sodium carbonate 25g / L, sodium phosphate 40g / L), keep warm in a water bath at 50°C for 60s, and then wash with 1M hydrogen Wash with an aqueous solution of sodium oxide at 60°C for 30s, and then use 400g / L nitric acid (ρ=1.42g / ml) to polish at room temperature 25°C for 1-2min. Rinse again with deionized water and dry with cold air.

[0059] Hydrothermal reaction steps: first pour the electrolyte solution into the liner of the reaction kettle, and then put the cleaned magnesium alloy sample into the in-situ growth solution, the in-situ growth solution: sodium nitrate 0.1M, aluminum nitrate 0.05M, nitric acid Lanthanum 0.001M, pH 10.9; after ...

Embodiment 3

[0068] A method for preparing a triple self-repairing SLIPS / LDHs composite film layer on the surface of a magnesium alloy, the specific steps are:

[0069] 1. In situ growth of MgAlLa-LDHs film layer

[0070] Soak the water-milled magnesium alloy AZ31 in the above-mentioned degreased and degreased aqueous solution (sodium hydroxide 40g / L, sodium carbonate 25g / L, sodium phosphate 40g / L), keep warm in a water bath at 50°C for 60s, and then wash with 1M hydrogen Wash with an aqueous solution of sodium oxide at 60°C for 30s, and then polish with 400g / L nitric acid at room temperature 25°C for 1-2min. Rinse again with deionized water and dry with cold air.

[0071] Hydrothermal reaction steps: first pour the electrolyte solution into the liner of the reaction kettle, and then put the cleaned magnesium alloy sample into the in-situ growth solution, the in-situ growth solution: sodium nitrate 0.1M, aluminum nitrate 0.05M, nitric acid Lanthanum 0.001M, pH 10.9; after closing the rea...

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Abstract

The invention relates to a preparation method of an SLIPS / LDHs composite film layer on the surface of a magnesium alloy. The preparation method comprises the following steps of growing a ternary MgAlLa-LDHs film layer on a magnesium alloy matrix in situ, further utilizing the unique ion exchange performance of LDHs to load anionic benzoate radicals, and then adopting fluorine-containing silane to carry out low surface energy modification on the LDHs so as to realize the pouring of simethicone on the surface of the LDHs, and prepare the SLIPS / LDHs composite film layer. The good hydrophobicity of the composite film layer can effectively isolate corrosion of external corrosive ions to the magnesium alloy matrix. La ions and benzoate ions with a corrosion inhibition effect and lubricating liquid with a physical flow effect can be subjected to triple self-repairing integrated design on the surface of the magnesium alloy. The preparation method is simple and low in cost, and the industrial practicability and the efficiency are greatly improved. The composite film layer can obviously improve the corrosion resistance of the magnesium alloy matrix, so that wide application of the magnesium alloy in the fields of aerospace, automobiles, electronics and the like is promoted.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and relates to a preparation method and application of a SLIPS / LDHs composite film on the surface of a magnesium alloy. Background technique [0002] As the lightest metal structure material in current engineering applications, magnesium alloy has low density (about 2 / 3 of aluminum, 1 / 4 of iron, and 1 / 3 of titanium), good damping, good thermal conductivity, and high specific stiffness With specific strength, easy machining, high recycling rate, abundant reserves, anti-electromagnetic interference and other excellent properties, it has great application prospects and practical value in aerospace, automobile industry, medical equipment, electronic communication and other fields. However, the high chemical activity and low electrode potential of magnesium lead to its poor corrosion resistance, which seriously affects its wide application in practice. Therefore, improving the corrosi...

Claims

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Application Information

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IPC IPC(8): C23C22/60C23C22/83B05D7/14
CPCC23C22/60C23C22/83B05D7/14C23C2222/20B05D2202/20
Inventor 姚文辉陈勇花吴量潘复生
Owner CHONGQING UNIV
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