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Preparation method for light green superhydrophobic corrosion-resistant film on surface of magnesium-lithium alloy

A magnesium-lithium alloy, light green technology, which is applied in the field of preparation of light green superhydrophobic corrosion-resistant coatings on the surface of magnesium-lithium alloys, can solve the problems of limited corrosion resistance and low corrosion resistance of the coating, and achieve improved corrosion resistance. The effect of corrosion resistance, low cost and simple operation

Inactive Publication Date: 2012-12-12
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The paper titled "A rapid and efficient strategy for creating super-hydrophobic coatings on various material substrates" (A rapid and efficient strategy for creating super-hydrophobic coatings on various material substrates) uses phase separation technology on different materials such as Polycarbonate coatings with superhydrophobic properties formed on the surface of aluminum sheets, glass sheets, stainless steel sheets, etc. (Zhang, Y.; Wang, H.; Yan, B.; Zhang, Y.; Yin, P.; Shen, G. .; Yu, R.Journal of Materials Chemistry2008, 18, 4442-4449), prepared yellow and blue super-hydrophobic film layers by adding coatings, but the corrosion resistance of the film itself is relatively limited, resulting in it not having high corrosion resistance corrosion performance

Method used

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  • Preparation method for light green superhydrophobic corrosion-resistant film on surface of magnesium-lithium alloy
  • Preparation method for light green superhydrophobic corrosion-resistant film on surface of magnesium-lithium alloy

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Embodiment 1

[0025] The preparation method of the light green superhydrophobic corrosion-resistant film layer on the surface of the magnesium-lithium alloy includes the preparation of the light green ceramic film layer by micro-arc oxidation coloring and the hydrophobic treatment by organic coating. The steps and process conditions are as follows:

[0026] Step 1: Preparation of light green ceramic film layer by micro-arc oxidation coloring

[0027] (1) Pre-treatment of magnesium-lithium alloy:

[0028] Process the magnesium-lithium alloy plate into a thin plate with a size of 50×30×2mm, remove the oxide film after pickling, and then ultrasonically clean it in acetone solution to remove oil and dirt, and dry it with a hair dryer;

[0029] (2) Preparation of micro-arc oxidation colored electrolyte: sodium silicate 20g / L, sodium molybdate 5g / L, sodium hydroxide 10g / L, potassium dichromate 2g / L, polyethylene glycol 2g / L, triethanolamine 5mL / L;

[0030] (3) The micro-arc oxidation coloring t...

Embodiment 2

[0036] Step 1: Preparation of light green ceramic film layer by micro-arc oxidation coloring

[0037] (1) Pre-treatment of magnesium-lithium alloy:

[0038] Process the magnesium-lithium alloy plate into a thin plate with a size of 50×30×2mm, remove the oxide film after pickling, and then ultrasonically clean it in acetone solution to remove oil and dirt, and dry it with a hair dryer;

[0039] (2) Preparation of micro-arc oxidation colored electrolyte: potassium silicate 5g / L, sodium molybdate 10g / L, sodium hydroxide 20g / L, sodium dichromate 4.5g / L, polyethylene glycol 1g / L, three Ethanolamine 10mL / L;

[0040] (3) The micro-arc oxidation coloring treatment is carried out by AC step-increasing and constant-voltage method. The process conditions are: voltage 70-160V, frequency 40Hz, treatment time 30min, and a low-temperature constant temperature bath to control the reaction temperature at 20-40°C.

[0041] Step 2: Hydrophobic treatment of organic coating

[0042] (1) prepare o...

Embodiment 3

[0046] Step 1: Preparation of light green ceramic film layer by micro-arc oxidation coloring

[0047] (1) Pre-treatment of magnesium-lithium alloy:

[0048] Process the magnesium-lithium alloy plate into a thin plate with a size of 50×30×2mm, remove the oxide film after pickling, and then ultrasonically clean it in acetone solution to remove oil and dirt, and dry it with a hair dryer;

[0049] (2) Preparation of micro-arc oxidation colored electrolyte: sodium silicate 40g / L, potassium molybdate 2g / L, sodium hydroxide 5g / L, potassium dichromate 0.5g / L, polyethylene glycol 5g / L, three Ethanolamine 1mL / L;

[0050] (3) The micro-arc oxidation coloring treatment is carried out by AC step-increasing and constant-voltage method. The process conditions are as follows: voltage is 80-160V, frequency is 60Hz, processing time is 10min, and the reaction temperature is controlled by a low-temperature constant temperature bath at 20-40°C.

[0051] Step 2: Hydrophobic treatment of organic c...

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Abstract

The invention discloses a preparation method for a light green superhydrophobic corrosion-resistant film on the surface of magnesium-lithium alloy. The method comprises the following steps: preparing a light green corrosion-resistant ceramic film on the surface of the magnesium-lithium alloy by using micro-arc oxidation coloring, wherein the ceramic film provides a micro-nano rough structure for preparation of the superhydrophobic film; and using triazine mercaptan organic compound salt containing fluorine substituent groups for organic film coating to realize hydrophobization which enables probability of contacting between a corrosion medium and a metal surface to be reduced and corrosion resistance of the film to be further improved. Potentiodynamic polarization corrosion current density of the light green superhydrophobic corrosion-resistant film on the surface of the magnesium-lithium alloy in an aqueous NaCl solution with a concentration of 0.1 mol / L is reduced by three orders of magnitude. The preparation method provided by the invention has simple operation and high efficiency and is easy for industrial production; and the prepared light green superhydrophobic corrosion-resistant film on the surface of the magnesium-lithium alloy has the characteristics of low cost and a wide application scope.

Description

technical field [0001] The invention relates to the technical field of magnesium-lithium alloy surface treatment and anti-corrosion technology, in particular to a method for preparing a light green superhydrophobic corrosion-resistant film layer on the surface of magnesium-lithium alloy. Background technique [0002] As the lightest metal structure material, magnesium-lithium alloy has high specific strength and specific stiffness and is easy to recycle and reuse, so it has a wide application prospect. However, due to the high chemical activity of magnesium element and the very active lithium element, various atmospheres will have different degrees of corrosion on magnesium-lithium alloys, and electrochemical corrosion is prone to occur in humid air, aqueous solution and sulfur-containing atmosphere. It has become one of the main forms of failure of magnesium-lithium alloys, which greatly limits the application of magnesium-lithium alloys. [0003] Many surface treatment pr...

Claims

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Application Information

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IPC IPC(8): C25D11/30C25D9/02
Inventor 康志新侯文婷
Owner SOUTH CHINA UNIV OF TECH
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