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Preparation method of magnesium alloy surface micro-arc oxidized nano self-assembling composite protective coating

A nano-self-assembly and micro-arc oxidation technology, which is applied to the surface coating liquid device, coating, anodic oxidation, etc., to achieve stable performance, wide range of sources, and the effect of inhibiting polymerization reaction

Inactive Publication Date: 2014-03-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the defects of the current single surface treatment technology of magnesium alloys, and provides a method for preparing a micro-arc oxidation nanometer self-assembled composite protective coating on the surface of magnesium alloys with good bonding force and high corrosion resistance, which meets the requirements of Protection requirements for magnesium alloy products in harsh environments

Method used

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  • Preparation method of magnesium alloy surface micro-arc oxidized nano self-assembling composite protective coating
  • Preparation method of magnesium alloy surface micro-arc oxidized nano self-assembling composite protective coating
  • Preparation method of magnesium alloy surface micro-arc oxidized nano self-assembling composite protective coating

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Effect test

Embodiment 1

[0031] 1. Material preparation: After the AZ91D magnesium alloy is cut, polished and polished, it is cleaned and degreased by ultrasonic waves in absolute ethanol solution.

[0032] 2. The configuration of micro-arc oxidation: sodium hydroxide 2g / L, sodium silicate 5g / L, the rest is water, and the temperature is room temperature. Micro-arc oxidation is carried out by high-voltage pulse method, the pulse frequency is 200Hz, and the current density is 2A / dm 2 , the oxidation time is 30min, the oxide film thickness is 10μm, the porosity is 30%, and the pore size is 1-4μm.

[0033] 3. Preparation of modified composite coating:

[0034] 1) Configuration of silane mixture. Mix and stir the silane KH-560 and TEOS at a molar ratio of n(KH560):n(TEOS)=4:1 to obtain a silane mixture.

[0035] 2) The configuration of the hydrolysis catalyst. Acetic acid and phytic acid are uniformly mixed in a molar ratio of n(acetic acid):n(phytic acid)=3:1 to obtain a hydrolysis catalyst.

[0036]...

Embodiment 2

[0052] 1. Material preparation: After the AZ31B magnesium alloy is cut, polished and polished, it is cleaned and degreased by ultrasonic waves in absolute ethanol solution.

[0053] 2. The configuration of micro-arc oxidation: sodium hydroxide 5g / L, sodium silicate 5g / L, the rest is water, and the temperature is room temperature. Micro-arc oxidation is carried out by high-voltage pulse method, the pulse frequency is 350Hz, and the current density is 2A / dm 2 , the oxidation time is 40min, the oxide film thickness is 15μm, the porosity is 28%, and the pore size is 2~5μm.

[0054] 3. Preparation of modified composite coating:

[0055] 1) Configuration of silane mixture. Mix and stir silane KH-560 and TEOS at a molar ratio of n(KH560):n(TEOS)=5:1 to obtain a silane mixture.

[0056] 2) The configuration of the hydrolysis catalyst. Acetic acid and phytic acid are uniformly mixed in a molar ratio of n(acetic acid):n(phytic acid)=:2 to obtain a hydrolysis catalyst.

[0057] 3) C...

Embodiment 3

[0065] 1. Material preparation: After AZ31B magnesium alloy is cut, polished and polished, it is cleaned and degreased by ultrasonic wave in acetone solution.

[0066] 2. The configuration of micro-arc oxidation: sodium hydroxide 5g / L, sodium silicate 15g / L, the rest is water, and the temperature is room temperature. Micro-arc oxidation is carried out by high-voltage pulse method, the pulse frequency is 500Hz, and the current density is 3A / dm 2 , the oxidation time is 30min, the oxide film thickness is 14~15μm, the porosity is 35%, and the pore diameter is 2~5μm.

[0067] 3. Preparation of modified composite coating:

[0068] 1) Configuration of silane mixture. Mix and stir silane KH-560 and TEOS at a molar ratio of n(KH560):n(TEOS)=5:2 to obtain a silane mixture.

[0069] 2) The configuration of the hydrolysis catalyst. Acetic acid and phytic acid are uniformly mixed in a molar ratio of n(acetic acid):n(phytic acid)=4:1 to obtain a hydrolysis catalyst.

[0070] 3) Config...

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Abstract

The invention discloses a preparation method of a magnesium alloy surface micro-arc oxidized nano self-assembling composite protective coating, and belongs to the technical field of magnesium alloy surface treatment. The method comprises the following steps: firstly performing micro-arc oxidation on a magnesium alloy matrix surface to form a porous ceramic layer, spraying modified water-based paint on the porous ceramic layer surface to form a water-based coating so as to form a composite protective coating composed of the porous ceramic layer and the water-based coating on the magnesium alloy matrix surface. The multilayer composite protective coating formed on the magnesium alloy surface has the features of good binding force, good compactness, high hardness, high corrosion resistance, high wear resistance and the like; the preparation method is simple, convenient and environment-friendly; the composite protective coating is an expected composite protective coating of the magnesium alloy application, and the protective requirement on the magnesium alloy product in severe environment is satisfied.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a preparation method of a micro-arc oxidation nanometer self-assembled composite protective coating on the surface of a magnesium alloy. Background technique [0002] As a very important metal material, magnesium alloy is the metal with the lowest density among metal structural materials. Compared with aluminum alloy, it has a large elastic modulus, good heat dissipation, good shock absorption, and large impact load capacity. Lightweight requirements for household appliances, communication electronic devices and automobiles. In addition, magnesium alloy also has superior properties such as high specific strength, high specific stiffness, good damping, good thermal conductivity and good vibration damping. As a substitute for steel, aluminum, plastic and other materials, it is widely used in the automotive industry, aerospace industry and electronics. Industry and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30B05D1/02B05D3/02C09D7/12
Inventor 杜克勤郭兴华王艳秋王勇郭泉忠王福会
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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