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Nanometer alumina particle enhanced conversion film preparation method

A nano-alumina and particle-reinforced technology, applied in the coating process of metal materials, etc., can solve problems such as obstruction, pollution of treatment liquid, difficulty in forming a solution with uniform dispersion of nanoparticles, etc.

Inactive Publication Date: 2013-01-30
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former is to stir the solution at a high speed, although the agglomerated particles are disaggregated under the action of the solution movement, the adsorption attraction between the particles exists, and it is difficult to completely form a solution with uniform dispersion of nanoparticles; the latter is to select one or more suitable dispersants to make them Adsorbed on the surface of nanoparticles, thereby changing the interaction between particles and liquid medium, particles and particles, so that there is a strong repulsion between particles, but adding dispersibility will pollute the treatment liquid, hinder or even destroy the nucleation and formation of the conversion film Growth

Method used

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  • Nanometer alumina particle enhanced conversion film preparation method
  • Nanometer alumina particle enhanced conversion film preparation method
  • Nanometer alumina particle enhanced conversion film preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1# process steps and parameters:

[0037] The first step, the method of electron beam charging the surface of alumina particles

[0038] 1) Put the nano-alumina particles into the sample box as mentioned above;

[0039] 2) Open the vacuum chamber of the electron beam equipment, and put the sample box containing nano-alumina particles on the sample stage;

[0040] 3) Close the vacuum chamber, turn on the mechanical pump to vacuum the electron beam vacuum chamber and electron gun to 10Pa, turn on the molecular pump to pump the electron beam vacuum chamber and electron gun to 0.005Pa;

[0041] 4) Set the high voltage of the electron gun to 30kW, the beam current density to 300mA, and the electron beam spot to be circular;

[0042] 5) Start the electron beam setting to charge the nanoparticles, the charging time is 30 minutes, and turn off the electron beam equipment after the time is up;

[0043] 6) Turn off the molecular pump and the mechanical pump in sequence, and sl...

Embodiment 2

[0062] 1# process steps and parameters:

[0063] The first step, the method of electron beam charging the surface of alumina particles

[0064] 1) Put the nano-alumina particles into the sample box as mentioned above;

[0065] 2) Open the vacuum chamber of the electron beam equipment, and put the sample box containing nano-alumina particles on the sample stage;

[0066] 3) Close the vacuum chamber, turn on the mechanical pump to vacuum the electron beam vacuum chamber and electron gun to 0.1Pa, turn on the molecular pump to pump the electron beam vacuum chamber and electron gun to 0.0005Pa;

[0067] 4) Set the high voltage of the electron gun to 10kW, the beam current density to 100mA, and the electron beam spot to be circular;

[0068] 5) Start the electron beam setting to charge the nanoparticles, the charging time is 5 minutes, and turn off the electron beam equipment after the time is up;

[0069] 6) Turn off the molecular pump and the mechanical pump in sequence, and s...

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Abstract

The present invention discloses a nanometer alumina particle enhanced conversion film preparation method, which comprises: (1) accumulating negative charges on the surface of nanometer alumina particles through electron streams emitted by an electron beam gun; (2) adding the obtained nanometer alumina particles to a film forming solution to prepare a conversion treatment solution; and (3) carrying out a degreasing decontamination treatment, an alkali washing treatment, and rinsing drying, and dipping an aluminum-magnesium alloy in the treatment solution containing the charged nanometer alumina particles to prepare the conversion film. With the method, the conversion film with uniform nanometer alumina particle distribution can be obtained. With the uniform nanometer alumina particle distribution, cracks caused by stress force during the conversion film forming process can be effectively reduced, toughness, strength and rigidity of the chemical conversion film can be significantly improved, and problems of the conversion film prepared by the existing conversion technology can be solved, wherein the problems comprise that: strength and toughness of the conversion film are not high, a large amount of micro-cracks caused by stress force exists, corrosion resistance is not ideal, and practical engineering requirements are difficult to meet.

Description

technical field [0001] The invention relates to an aluminum-magnesium alloy surface treatment method, and in particular provides a preparation method for a nano-alumina particle-reinforced conversion film. Background technique [0002] The chemical conversion coating is a reaction film formed on the metal surface by the chemical reaction between the metal surface atoms and the anions and cations of the chemical solution, which can significantly improve the corrosion resistance of the alloy. Compared with anodic oxidation and electroplating technology, the chemical conversion process is not affected by the shape, size and electric field distribution of the workpiece, and can form a film with uniform thickness; The conversion coating is more firmly bonded to the substrate. [0003] The conversion coating prepared by the current conversion technology is not high in strength and toughness, there are a large number of microcracks caused by stress, and the corrosion resistance is...

Claims

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Application Information

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IPC IPC(8): C23C22/73
Inventor 赵明何广平屈敏李婷婷郑刘斌
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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