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Corrosion-inhibiting anion-intercalated hydrotalcite film prepared by hydrothermal deposition on magnesium alloy surface

A technology of anion intercalation and hydrotalcite, which is applied in metal material coating technology, coating, liquid chemical plating, etc., can solve problems such as environmental pollution, water and soil pollution, poisonous electroplating method, etc., and achieve green preparation process Environmental protection, high corrosion resistance, and effect of improving corrosion resistance

Active Publication Date: 2015-12-02
滕州市产品质量监督检验所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Hexavalent chromium ions in chromate conversion coatings are highly toxic and cause environmental pollution; the pretreatment process of stannate and phosphate conversion coating samples is complicated, which pollutes water and soil; anodizing equipment requires high requirements and consumes a lot of energy; Electroplating is toxic and difficult to handle
[0004] In summary, the existing methods generally have problems such as high process cost, complicated process, and poor coating adhesion.

Method used

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  • Corrosion-inhibiting anion-intercalated hydrotalcite film prepared by hydrothermal deposition on magnesium alloy surface
  • Corrosion-inhibiting anion-intercalated hydrotalcite film prepared by hydrothermal deposition on magnesium alloy surface
  • Corrosion-inhibiting anion-intercalated hydrotalcite film prepared by hydrothermal deposition on magnesium alloy surface

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preparation example Construction

[0032] The present invention, a kind of preparation method of corrosion-inhibiting anion intercalation hydrotalcite film, it comprises the following steps:

[0033] Step 1. Pretreatment of magnesium alloy samples:

[0034] First, the magnesium alloy sheet is polished with sandpaper until the surface becomes a mirror surface, degreased in lye, rinsed with deionized water, cleaned with an ultrasonic cleaner in acetone for 10 minutes, then ultrasonically cleaned in deionized water for 10 minutes, and cooled with air. Blow dry and set aside.

[0035] Step 2, preparation of LDHs sol:

[0036] (1) The soluble divalent metal salt AY 2 and soluble trivalent metal salt BY 3 Dissolve in deionized water according to the ratio of substance quantity 2:1, and make AY of 0.02~0.2mol / L 2 and 0.01~0.1mol / LBY 3 The mixed solution, the mixed solution is placed in a three-necked flask, stirred, heated to 60 ~ 80 ° C;

[0037] (2) Weigh a certain amount of NaOH and corrosion-inhibiting anion...

Embodiment 1

[0042] Step 1, pretreatment of magnesium alloy samples:

[0043] First, the die-casting magnesium alloy AZ31 sample with a size of 20mm×20mm×3mm is polished with sandpaper until the surface is mirror-like, degreased in lye, rinsed with deionized water, cleaned with an ultrasonic cleaner in acetone for 10 minutes, and then placed Ultrasonic cleaning in deionized water for 10 minutes, air-dried with cold air, and set aside.

[0044] Step 2. Magnesium aluminum molybdate LDHs (MgAl-MoO 4 2- -LDHs) sol preparation:

[0045] (1) Weigh 0.04molMg(NO 3 ) 2 ·6H 2 O and 0.02molAl(NO 3 ) 3 9H 2 O, add 150mL deionized water as a solvent to make a solution, put it in a three-necked flask, stir and heat to 80°C;

[0046] (2) Weigh 0.13molNaOH and 0.04molNa 2 MoO 4 2H 2 Dissolve O in 150mL deionized water, mix well, and 2 Slowly add it into a three-necked flask under protection, adjust the pH to 10, keep heating at 80°C, and keep stirring with a stirrer for 72h, and age for 12h. ...

Embodiment 2

[0052] Step 1 is the same as Embodiment 1 Step 1, and the difference from Embodiment 1 is:

[0053] Step 2. Magnesium aluminum tungstate LDHs (MgAl-WoO 4 2- -LDHs) sol preparation:

[0054] (1) Weigh 0.04mol of Mg(NO 3 ) 2 ·6H 2 O and 0.02mol of Al(NO 3 ) 3 9H 2 O, add 150mL deionized water as a solvent to make a solution, put it in a three-necked flask, stir and heat to 70°C;

[0055] (2) Weigh 0.13molNaOH and 0.04molNa 2 WoO 4 2H 2 Dissolve O in 150mL deionized water, mix well, and 2 Slowly add it into a three-necked flask under protection, adjust the pH to 9, keep heating at 70°C, keep stirring with a stirrer for 72h, and age for 12h.

[0056] Step 3, steps of magnesium alloy sample and above-mentioned LDHs sol hydrothermal deposition:

[0057] Put the treated magnesium alloy sample and the above 70mLLDHs sol in a 100mL hydrothermal reaction kettle, then put the hydrothermal reaction kettle into a drying oven for hydrothermal deposition, set the temperature at ...

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Abstract

The invention provides a preparation method of a corrosion-inhibition anion intercalation hydrotalcite film, which solves the problems in the prior art of complex preparation technology and poor adhesion property of hydrotalcite film coatings. The preparation method comprises the following steps: a) pretreatment of a magnesium alloy sample; b) preparation of a layered dihydroxy composite metal oxide precursor (LDHs sol); c) hydro-thermal deposition of the magnesium alloy sample obtained in pretreatment in step a) and the LDHs sol in step b) in a hydro-thermal reaction vessel. The film prepared in the invention is dense, smooth, uniform in thickness, and good in substrate bonding force; since the hydrotalcite film has a corrosion-inhibition anion intercalation, a corrosion inhibition area can be formed in a boundary diffusion layer, which provides the film with high corrosion resistance. Detection shows that the hydrotalcite film of the invention has no pitting corrosion on the surface after soaked in a 3.5% NaCl solution for 12 hours.

Description

technical field [0001] The invention relates to a method for preparing a corrosion-inhibiting anion-intercalation hydrotalcite film, in particular to a corrosion-inhibiting anion-intercalation hydrotalcite film prepared by a magnesium alloy surface hydrothermal deposition method. Background technique [0002] Magnesium alloy has the characteristics of light weight, high specific strength, high hardness, good electromagnetic shielding performance, machinability and thermoforming performance, good thermal conductivity, good biocompatibility, etc. It is an ideal for developing a new generation of high-tech materials Therefore, magnesium alloys have important application value and broad application prospects in the fields of automobiles, electronics, aerospace, national defense, biomedicine, etc., and are called "green engineering materials" in the 21st century. With the development and continuous improvement of magnesium production and processing technology, magnesium alloy mat...

Claims

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Application Information

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IPC IPC(8): C23C18/12
Inventor 张芬曾荣昌刘振国崔洪芝宋亮
Owner 滕州市产品质量监督检验所
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