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Method for preparing modified polymethyl methacrylate anticorrosive coating on magnesium alloy surface

A plexiglass and surface modification technology, which is applied in metal material coating technology, coating, liquid chemical plating, etc., can solve the problem of unsustainable protection, poor protection effect of a single film layer, and excessive particle size of sol agglomeration and other issues to achieve the effect of improving corrosion resistance

Inactive Publication Date: 2016-08-17
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to improve the problems of thin sol-gel film on the surface of magnesium alloy, too large particle size of sol agglomeration, poor protective effect of a single film layer, and unsustainable protection, different catalysts and chemical additives were added to improve the resistance of the sol-gel film on the surface of magnesium alloy. corrosion performance

Method used

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  • Method for preparing modified polymethyl methacrylate anticorrosive coating on magnesium alloy surface
  • Method for preparing modified polymethyl methacrylate anticorrosive coating on magnesium alloy surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Use 360#, 600#, 800#, 1000#, 1200#, 1500#, 2000# sandpaper to polish in sequence until the surface of AZ91D magnesium alloy is bright. After mechanical polishing, wash it with running water, dry it with cold wind, deionized water, Acetone was used to ultrasonically remove surface impurities in sequence, and then ultrasonically cleaned in a NaOH solution with a pH of 10 in a water bath at 50°C for 10 minutes, and dried with cold air for later use.

[0035] (2) Weigh 5g of tetraethyl orthosilicate and 2.98g of KH-570 and mix evenly, add 1mL of dilute hydrochloric acid with a mass fraction of 5% to catalyze, 45 。 Heating at C for 2h, forming viscous liquid A, namely SiO 2 Sol.

[0036] (3) Fully dissolve 1.68g of zirconium oxychloride in 10mL of ethanol solution, add the above mixed solution A, continue to heat, add about 1mL of 5% NaOH lye solution dropwise in the middle to control the reaction hydrolysis polycondensation rate, and form SiO 2 -ZrO 2 hybrid sol.

...

Embodiment 2

[0040] (1) Grind the magnesium alloy with sandpaper, and mechanically polish it to a mirror surface, wash it with deionized water and acetone in sequence, and then ultrasonically wash it in NaOH solution with a pH value of 9 at 50°C for 5 minutes, and then ultrasonically wash it in deionized water for 3 minutes. Blow dry with cold air.

[0041] (2) Weigh 7g of tetraethyl orthosilicate solution and 4g of γ-methacryloxypropyltrimethoxysilane solution and mix evenly, and add 2mL of dilute hydrochloric acid with a mass fraction of 5% as a catalyst, and heat to form Viscous liquid is SiO 2 Sol.

[0042] (3) Fully dissolve 1g of zirconium oxychloride in 20mL ethanol solution, add the SiO 2 In the sol, continue heating, and add 5% sodium hydroxide alkali solution drop by drop during the heating process to control the reaction hydrolysis polycondensation rate to form SiO 2 -ZrO 2 hybrid sol.

[0043] (4) Add 10 g of methyl methacrylate dissolved in 0.03 g of azobutyronitrile, add...

Embodiment 3

[0046] (1) Grind the magnesium alloy with sandpaper, and mechanically polish it to a mirror surface, wash it with deionized water and acetone in sequence, and then ultrasonically wash it in NaOH solution with a pH value of 11 at 80°C for 15 minutes, and ultrasonically in deionized water for 5 minutes. Blow dry with cold air.

[0047] (2) Weigh 7g of tetraethyl orthosilicate solution and 4g of γ-methacryloxypropyltrimethoxysilane solution and mix evenly, and add 1mL of dilute hydrochloric acid with a mass fraction of 5% as a catalyst, and heat to form Viscous liquid is SiO 2 Sol.

[0048] (3) Fully dissolve 3g of zirconium oxychloride in 10mL ethanol solution, and add the SiO 2 In the sol, continue heating, and add 5% sodium hydroxide alkali solution drop by drop during the heating process to control the reaction hydrolysis polycondensation rate to form SiO 2 -ZrO 2 hybrid sol.

[0049] (4) Add 10 g of methyl methacrylate dissolved in 0.03 g of azobutyronitrile, add 1 mL o...

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Abstract

The invention discloses a method for preparing a modified polymethyl methacrylate anticorrosive coating on a magnesium alloy surface. The method comprises the steps of treating the magnesium alloy surface; mixing a tetraethyl orthosilicate solution with a gamma-methacryloxy propyl trimethoxyl silane solution, adding a catalyst, and heating to form sol; adding an ethanol solution in which zirconium oxychloride is dissolved into the sol, continuously heating, dropwise adding a sodium hydroxide alkaline solution, and controlling the reaction rate to form SiO2-ZrO2 hybrid sol; adding methyl methacrylate in which AIBN is dissolved, N-N-dimethylformamide and a cerous nitrate aqueous solution, and heating in the water bath environment to prepare modified PMMA-SiO2-ZrO2 hybrid sol; and smearing the PMMA-SiO2-ZrO2 hybrid sol on the surface of a magnesium alloy surface base material through rotation, drying, keeping the temperature, and cooling to prepare the modified polymethyl methacrylate anticorrosive coating on the magnesium alloy surface. According to the method, different catalysts and chemical additives are added, so that the corrosion resistance of a sol gel film on the magnesium alloy surface is improved.

Description

technical field [0001] The present invention relates to a kind of magnesium alloy surface modification method, especially a kind of magnesium alloy surface modification PMMA-SiO 2 -ZrO 2 A method for hybrid sol-gel membranes. Background technique [0002] Magnesium alloys are widely used in production and life due to their light weight and excellent impact resistance, but their poor corrosion resistance seriously restricts the application potential of magnesium alloys. In the magnesium alloy anticorrosion modification technology, the film layer prepared by the sol-gel method has no pollution, is easy to prepare, and has a fast film forming speed. It can be widely used in any workpiece with excellent properties such as film formation. For example, the publication number is CN103556141 A, which discloses "a preparation method of sol-gel film on the surface of magnesium alloy". In this method, 10-30mL tetraethyl orthosilicate is dissolved in 10-30mL ethanol solution, and the ...

Claims

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Application Information

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IPC IPC(8): C23C18/18C23C18/12
CPCC23C18/1254C23C18/1806
Inventor 范爱兰郭亚鑫李轩鹏华帅唐宾
Owner TAIYUAN UNIV OF TECH
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