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

A double-hydroxy compound and layered double-hydroxy technology, which is applied in coatings, surface reaction electrolytic coatings, electrolytic coatings, etc., can solve the problems of unfriendly environment and toxic corrosion inhibitors, and achieve improved corrosion resistance and good protection Function, the effect of excellent anti-corrosion performance

Inactive Publication Date: 2012-08-15
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A. Ultrasonic cleaning the aluminum sheet with a purity of 99.99wt% with deionized water and acetone for 5 minutes to remove impurities and oil stains on the surface, then ultrasonically cleaning it with 1% sodium hydroxide solution for 2 minutes, and then cleaning it with deionized water Clean it up and oxidize it in an anodizing device. 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 is taken out after anodizing for 60 minutes, and the electrolyte solution is washed away 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 deionized water, and prepare NH 4 + : Zn 2+ Molar ratio is 200ml of the reaction solution of 6, wherein Zn 2+ The molar concentration is 0.01mol / L, and the pH is adjusted to 6.5 with 1wt% am...

Embodiment 2

[0038] A. Ultrasonic cleaning the aluminum sheet with a purity of 99.99wt% with deionized water and acetone for 6 minutes to remove impurities and oil stains on the surface, then ultrasonically cleaning it with a sodium hydroxide solution with a mass fraction of 1wt% for 3 minutes, and then cleaning it with deionized water Clean it up and oxidize it in an anodizing device. 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 is taken out after anodizing for 60 minutes, and the electrolyte solution is washed away 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 deionized water, and prepare NH 4 + : Zn 2+ Molar ratio is 200ml of the reaction solution of 6, wherein Zn 2+ The molar concentration is 0.05mol / L, and the pH is...

Embodiment 3

[0045] A. Ultrasonic cleaning the aluminum sheet with a purity of 99.99wt% with deionized water and acetone for 8 minutes to remove impurities and oil stains on the surface, then ultrasonically cleaning it with 3% sodium hydroxide solution for 2 minutes, and then cleaning it with deionized water Clean it up 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, after anodizing the aluminum sheet for 60 minutes, take it out, rinse off the electrolyte with deionized water, and obtain an anodized aluminum sheet on the surface for use;

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

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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 preparation of anti-corrosion materials, and in particular relates to an anti-corrosion layered double hydroxyl compound metal hydroxide film grown on a surface anodized aluminum substrate and a preparation method thereof. Background technique [0002] Aluminum is the most widely used metal material among 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 severe electrochemical corrosion, resulting in serious waste of aluminum. In order to minimize the loss caused by corrosion, the method of using thin film (coating) protection is the most widely used and most effective measure in the anti-corrosion method. [0003] Chromium conversion coating can play a very good protective role, but it will produce toxic Cr in the process of application 6+ , causing p...

Claims

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Application Information

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IPC IPC(8): C25D11/24
Inventor 张法智彭青闫婷婷
Owner BEIJING UNIV OF CHEM TECH
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