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Preparation method of nanocomposite chemical conversion film on surface of aluminum alloy

A technology of chemical conversion film and aluminum alloy surface, which is applied in the field of preparation of nanocomposite chemical conversion film on the surface of aluminum alloy, can solve the problems of non-prominent effects, illegal identification, poor corrosion resistance, etc., and achieve excellent corrosion resistance and The effect of conductivity

Active Publication Date: 2019-03-08
WUHAN RES INST OF MATERIALS PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of titanium-zirconium conversion coatings is poor corrosion resistance, without the self-healing and repairing function of hexavalent chromium conversion coatings, the film layer is thin and colorless, and cannot be identified, and other functions are not outstanding

Method used

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  • Preparation method of nanocomposite chemical conversion film on surface of aluminum alloy
  • Preparation method of nanocomposite chemical conversion film on surface of aluminum alloy
  • Preparation method of nanocomposite chemical conversion film on surface of aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The material used is 6061 aluminum alloy, processed by wire cutting process, and the sample size is 60mm x 30mm x3mm. The bare material is pre-treated by alkali cleaning, degreasing, acid cleaning and activation, and the Ti-Zr chemical conversion coating is prepared on the AA6061 alloy substrate after conversion solution treatment. The conversion solution is 32g / L hexafluorotitanic acid, 8g / L hexafluorotitanic acid, the reaction time is 2min, the reaction temperature is 25°C, and the reaction pH is 4; the treated substrate is rinsed with deionized water and dried in a 60°C oven Baking for 20 minutes and aging for 24 hours can be further tested.

Embodiment 2

[0029] 2.1 Preparation of Ni-CNT

[0030] The single-walled carbon nanotubes (CNTs) used in this study were provided by Chengdu Organic Chemistry Co., Ltd., Chinese Academy of Sciences. By putting the sensitized and activated CNTs into sodium citrate (complexing agent), ammonium chloride (buffer or stabilizer) , nickel sulfate and sodium hypophosphite in the treatment solution, prepared Ni-CNT. The process flow of nickel coating treatment is divided into three steps. The specific steps are: first step: oxidation grinding; second step: sensitization and activation; third step: nickel plating. The activated CNT was added to the electroless nickel plating solution (20g / L sodium citrate, 30g / L ammonium chloride, 30g / L nickel sulfate), and ultrasonicated for 5min. Adjust the pH to 8.5-9.5 (ammonia water), keep the temperature at 25°C, slowly drop in sodium hypophosphite solution (30g / L sodium hypophosphite), stop the reaction after no obvious phenomenon is seen, filter, wash unti...

Embodiment 3

[0034] The preparation process is the same as that in Example 2, with only the following differences: in the conversion solution, 32g / L hexafluorotitanic acid, 8g / L hexafluorotitanic acid and 16g / L CNT (activated in concentrated nitric acid for 12h); the reaction time is 2min respectively;

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Abstract

The invention discloses a preparation method of nanocomposite chemical conversion film on the surface of an aluminum alloy. The preparation method comprises the following step that B, a to-be-treatedaluminum alloy is soaked in conversion liquid, and the chemical conversion film is formed on the surface of the aluminum alloy, wherein the conversion liquid contains a carbon nano tube or a nickel-coated carbon nano tube. According to the preparation method, by adding CNT / Ni-CNT, as an accelerant, into the conversion liquid containing Ti and Zr, the novel modified chromium-free chemical nanocomposite film is fast prepared, and the film forming time is only 1-2 min; by adding the CNT / Ni-CNT, the film is made smoother and more compact; and no obvious pore is found on the surface of the film, the alloy is completely covered in a short time, and the novel film has the more excellent corrosion resistance and conductivity on the base material.

Description

technical field [0001] The invention relates to the field of metal surface treatment. More specifically, the present invention relates to a method for preparing a nanocomposite chemical conversion film on the surface of an aluminum alloy. Background technique [0002] Various series of aluminum alloys play an important role in the advanced manufacturing process, such as: 6XXX series aluminum alloys are suitable for lightweight materials for automotive applications, used for body, wheel, fuel tank, engine cover, motor housing and other structures, 2XXX Series and 7XXX series as new high-strength aluminum alloys are suitable for many parts of aerospace vehicle fuselage and instruments, and 1XXX series and 8XXX series aluminum foils are widely used as current collectors for lithium-ion batteries. Under natural conditions, the oxide skin on the surface of pure aluminum alloy is thin and porous, which is prone to pitting corrosion, crevice corrosion and denudation. Scientific r...

Claims

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Application Information

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IPC IPC(8): C23C22/56C23C18/36
CPCC23C18/1886C23C18/36C23C22/56
Inventor 占稳刘晓辉欧阳贵
Owner WUHAN RES INST OF MATERIALS PROTECTION