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Preparation method of corrosion resistant hydrotalcite-like film at surface of aluminum and aluminum alloy parts

A technology of aluminum alloy parts and corrosion resistance, which is applied in the field of preparation of hydrotalcite-like films, can solve problems such as high requirements for operating conditions, influence of thermal stability, complex process, etc., and achieve good corrosion resistance, good bonding force, and simple process Effect

Inactive Publication Date: 2008-10-15
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Document 3. In the patent application 200610088993.8, our experimental group provided a method for preparing zinc-aluminum hydrotalcite films on anodized aluminum. complex
However, most of them use powder materials, which are mixed with organic adhesives to increase their viscosity and then coated on the surface of the metal substrate to form a film for research. This will limit the durability of the film to a certain extent. After adding organic compounds, Its thermal stability is also affected

Method used

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  • Preparation method of corrosion resistant hydrotalcite-like film at surface of aluminum and aluminum alloy parts
  • Preparation method of corrosion resistant hydrotalcite-like film at surface of aluminum and aluminum alloy parts
  • Preparation method of corrosion resistant hydrotalcite-like film at surface of aluminum and aluminum alloy parts

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Experimental program
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Effect test

Embodiment 1

[0034] A. Pretreatment of aluminum parts: ultrasonically clean the aluminum parts with deionized water and acetone for 10 minutes to remove impurities and oil stains on the surface, and then soak them in 0.5% sodium hydroxide solution to remove the oxide layer on the surface;

[0035] 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 1% ammonia water;

[0036] C. Suspend the pretreated aluminum parts in the reaction solution and place at 120°C for 24h. After that, take out the substrate and wash it with ethanol, then dry it naturally to get the surface covered with interlayer anions as NO 3 - The aluminum part of the zinc-aluminum hydrotalcite film, the molecular formula of the hydrotalcite film is [Zn 2+ 1-x Al 3+ x (OH) 2 ] x+ ·(NO 3 - ) x / n mH ...

Embodiment 2

[0038] A. Pretreatment of aluminum parts: ultrasonically clean the aluminum parts with deionized water and acetone for 10 minutes to remove impurities and oil stains on the surface, and then soak them in 0.5% sodium hydroxide solution to remove the oxide layer on the surface;

[0039] B. Weigh 1.745g of nickel nitrate and 2.881g of ammonium nitrate, dissolve them in 200ml of deionized water, and prepare NH 4 + : Ni 2+ 200ml of a reaction solution with a molar ratio of 6, wherein Ni 2+ The molar concentration is 0.03mol / L, and the pH is adjusted to 7.5 with 0.5% ammonia water;

[0040] C. Suspend the pretreated aluminum parts in the reaction solution and place at 150°C for 24h. After that, take it out, wash it with ethanol, and dry it naturally to get the surface covered with interlayer anions as NO 3 - The aluminum part of the nickel-aluminum hydrotalcite film, the molecular formula of the hydrotalcite film is [Ni 2+ 1-x Al 3+ x (OH) 2 ] x+ ·(NO 3 - ) x / n mH 2 O...

Embodiment 3

[0042] A. Pretreatment of aluminum parts: ultrasonically clean the aluminum parts with deionized water and acetone for 10 minutes to remove impurities and oil stains on the surface, and then soak them in a sodium hydroxide solution with a mass fraction of 1.0% to remove the oxide layer on the surface;

[0043] B. Weigh 27.232g of zinc chloride and 32.094g of ammonium chloride, dissolve them in 200ml deionized water, and prepare NH 4 + : Zn 2+ Molar ratio is 200ml of the reaction solution of 4, wherein Zn 2+ The molar concentration is 1.0mol / L, and the pH is adjusted to 7.0 with 0.1% dilute ammonia solution;

[0044] C. Suspend the pretreated aluminum parts in the reaction solution and place at 90°C for 36h. After that, take it out, wash it with ethanol, and dry it naturally to get the surface covered with interlayer anion as Cl - The aluminum part of the zinc-aluminum hydrotalcite film, the molecular formula of the hydrotalcite film is [Zn 2+ 1-x Al 3+ x (OH) 2 ] x+ ...

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Abstract

The invention relates to a method for preparing erosion resistant hydrotalcite-like films on the surfaces of aluminum and aluminum alloy parts. The method is as follows: firstly, ultrasonic treatment of the metallic aluminum and the aluminum alloy parts is performed respectively in deionized water and acetone so as to remove impurities and oil stains on the surfaces; secondly, the metallic aluminum and the aluminum alloy parts are placed in ammonium salt-bearing soluble divalent metallic salt reaction solution and the parts react with soluble divalent metallic salts in the reaction solution by using the aluminum on the surfaces of the parts as aluminum source, and then the hydrotalcite-like films are synthesized on the surfaces of the parts, wherein, the chemical formula of the film is [M<2+>1-xAl<3+>x (OH) 2]< x+ >.(Y)x / n.mH2O. The technique used by the method is simple; the raw materials are easy to obtain; the cost is low; the repeatability is good; the prepared films have good erosion resistance; and the layered double-hydroxyl composite metal oxide films are possibly used as erosion resistant coatings of the metallic aluminum and the aluminum alloy parts among engineering materials.

Description

Technical field: [0001] The technology belongs to the technical field of anticorrosion of aluminum and its alloy parts, and specifically relates to a method for preparing a hydrotalcite-like film by using a surface crystallization method and using aluminum and aluminum alloy parts as a substrate. technical background: [0002] Aluminum is the metal material with the largest amount of use and the widest application range among non-ferrous metals, and the scope of application is still expanding. Aluminum materials have a series of excellent physical, chemical, mechanical and processing properties, such as low density, high plasticity, easy strengthening, good electrical conductivity, easy recycling, and easy surface treatment. Aluminum and aluminum alloys are widely used in the fields of defense industry, aerospace industry, automobile manufacturing, electronics, instrumentation and daily products due to their excellent performance. However, the activity of aluminum is relati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/56C23C22/78
Inventor 张法智赵丽丽徐赛龙段雪
Owner BEIJING UNIV OF CHEM TECH