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Anticorrosive layered double-hydroxy composite metal hydroxide film and preparation method thereof

A technology of double hydroxyl compound and hydroxide, applied in the direction of coating, surface reaction electrolytic coating, electrolytic coating, etc., can solve the problems of unfriendly environment, poisonous corrosion inhibitors, etc., and achieve improved corrosion resistance and good protection , good corrosion resistance effect

Inactive Publication Date: 2015-01-14
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it is worth noting that most of the corrosion inhibitors intercalated between the hydrotalcite layers are toxic and environmentally unfriendly

Method used

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  • Anticorrosive layered double-hydroxy composite metal hydroxide film and preparation method thereof
  • Anticorrosive layered double-hydroxy composite metal hydroxide film and preparation method thereof

Examples

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Effect test

Embodiment 1

[0027] A. The aluminum sheet with a purity of 99.99wt% was ultrasonically cleaned with deionized water and acetone for 5 minutes to remove impurities and oil stains on the surface, and then ultrasonically cleaned with a 1% sodium hydroxide solution for 2 minutes, and deionized water was used. Clean it and put it into an anodizing device for oxidation, in which the aluminum sheet is used as the anode, the lead plate is used as the cathode, the electrolyte is 1mol / L sulfuric acid solution, and the oxidation voltage is 2V / cm 2 The aluminum sheet was taken out after anodic oxidation for 60 minutes, and the electrolyte was rinsed with deionized water to obtain an anodized aluminum sheet on the surface for use;

[0028] B. Weigh 0.595g of zinc nitrate and 0.96g of ammonium nitrate, dissolve them in 200ml of deionized water, and prepare NH 4 + : Zn 2+ 200ml of reaction solution with a molar ratio of 6, in which Zn 2+ The molar concentration is 0.01mol / L, and the pH is adjusted to 6....

Embodiment 2

[0038] A. The aluminum sheet with a purity of 99.99wt% was ultrasonically cleaned with deionized water and acetone for 6 minutes to remove impurities and oil stains on the surface, and then ultrasonically cleaned with a sodium hydroxide solution with a mass fraction of 1wt% for 3 minutes, and deionized water was used. Clean it and put it into an anodizing device for oxidation, in which the aluminum sheet is used as the anode, the lead plate is used as the cathode, the electrolyte is 1mol / L sulfuric acid solution, and the oxidation voltage is 2V / cm 2 The aluminum sheet was taken out after anodic oxidation for 60 minutes, and the electrolyte was rinsed with deionized water to obtain an anodized aluminum sheet on the surface for use;

[0039] B. Weigh 2.975g of zinc nitrate and 4.8g of ammonium nitrate, dissolve them in 200ml of deionized water, and prepare NH 4 + : Zn 2+ 200ml of reaction solution with a molar ratio of 6, in which Zn 2+ The molar concentration is 0.05mol / L, a...

Embodiment 3

[0045] A. The aluminum sheet with a purity of 99.99wt% was ultrasonically cleaned with deionized water and acetone for 8 minutes to remove impurities and oil stains on the surface, and then ultrasonically cleaned with a 3% sodium hydroxide solution for 2 minutes, and deionized water was used. Clean it and put it into an anodizing device for oxidation, in which the aluminum sheet is used as the anode, the lead plate or stainless steel plate is used as the cathode, the electrolyte is 1.0mol / L sulfuric acid solution, and the oxidation voltage is 2V / cm 2 Aluminum sheet, take out the aluminum sheet after anodic oxidation for 60min, rinse the electrolyte with deionized water, and obtain the surface anodized aluminum sheet for use;

[0046] B. Weigh 2.975g of zinc nitrate and 6.4g of ammonium nitrate, dissolve them in 200ml of deionized water, and prepare NH 4 + : Zn 2+ 200ml of reaction solution with a molar ratio of 8, in which Zn 2+ The molar concentration is 0.05mol / L, and the...

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Abstract

The invention discloses an anticorrosive layered double-hydroxy composite metal hydroxide film growing on an aluminum body with an anodized surface, belonging to the field of anticorrosive material preparation technology and a preparation method for the film. The layered double-hydroxide composite metal hydroxide film is prepared by in situ synthesis technology on an anodized aluminum sheet. After the film is modified with a highly anticorrosive amino acid anionic surfactant, the anticorrosive performance of the film is remarkably improved. With good biodegradability and good corrosion resistance, the used amino acid anionic surfactant has no environmental pollution, and is often used as a slow-release agent, a rust remover and the like in metal processing. The experimental method adopts simple process and easily-accessible raw materials, and has low cost and good repeatability. The obtained film has good corrosion resistance and can well protect the metal.

Description

technical field [0001] The invention belongs to the technical field of anti-corrosion material preparation, and in particular relates to an anti-corrosion layered double-hydroxyl composite metal hydroxide film grown on an anodized aluminum substrate and a preparation method thereof. Background technique [0002] Aluminum is the most widely used and widely used metal material in non-ferrous metals. However, the activity of aluminum is relatively high, and its corrosion resistance is poor, especially in humid air, sulfur-containing atmosphere and marine atmosphere, it will suffer serious electrochemical corrosion, resulting in serious waste of aluminum. In order to reduce the loss caused by corrosion to a minimum, the method of film (coating) protection is currently the most widely used and most effective measure in the anti-corrosion method. [0003] Chromium conversion coating can play a good protective role, but it will produce toxic Cr in the process of application 6+ , ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/24
Inventor 张法智彭青闫婷婷
Owner BEIJING UNIV OF CHEM TECH