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Micro-arc oxidation smooth black ceramic film on magnesium alloy and preparation method thereof

A micro-arc oxidation, black ceramic technology, applied in anodizing, electrolytic coating, surface reaction electrolytic coating, etc., can solve problems such as unfavorable industrial production and application, great environmental damage, increase operation links, etc., to achieve excellent bonding force, Small surface roughness and less environmental pollution

Inactive Publication Date: 2018-09-28
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many technical disadvantages in anodic oxidation coloring: (1) The oxide film formed by anodic oxidation is relatively brittle, has poor bonding performance with the substrate, and is easy to fall off under stress conditions; under many conditions, it must be processed with resin or coating. Sealing makes the process more cumbersome; (2) The anodic oxidation electrolyte is often acidic, which is very harmful to the environment; (3) The anodic oxidation coloring is a two-step coloring, that is, the anodic oxidation film is first formed, and then placed in other electrolytes electrolytic coloring
[0005] At present, the research on the micro-arc oxidation coloring of magnesium alloys is mainly concentrated in China, and there are mainly the following deficiencies: (1) The solution contains highly toxic substances; for example, the micro-arc oxidation coloring is carried out on the surface of magnesium alloys by adding potassium bicatalyst (Yuan Xufang Preparation of dark ceramic film by micro-arc oxidation of rare earth magnesium alloy[D].2008 Changchun University of Science and Technology Master's Degree Thesis)
However, the required pretreatment process includes degreasing, surface activation, surface adjustment and other processes, which increases the operation links and makes the process complicated, which is not conducive to the actual industrial production application

Method used

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  • Micro-arc oxidation smooth black ceramic film on magnesium alloy and preparation method thereof
  • Micro-arc oxidation smooth black ceramic film on magnesium alloy and preparation method thereof
  • Micro-arc oxidation smooth black ceramic film on magnesium alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A method for preparing a magnesium alloy micro-arc oxidation smooth black ceramic film, comprising the following steps:

[0036] (1) Pretreatment: Cut a sample with a size of 20mm×20mm×1mm from a magnesium alloy sheet of model AZ91D, and use 150#, 400#, 600#, 800#, 1200#, 2000# SiC sandpaper to The surface of the magnesium-aluminum alloy is polished until the direction of the scratch is consistent, and then it is cleaned with acetone, absolute ethanol, and deionized water in an ultrasonic wave for 10 minutes to remove oil stains, and then dried for later use.

[0037] (2) Prepare electrolyte: weigh 20g of sodium silicate, 25g of sodium hexametaphosphate, 12g of potassium fluoride, 12g of ammonium metavanadate, 2g of sodium hydroxide, 4g of EDTA (ethylenediaminetetraacetic acid), lemon Dissolve 4 g of sodium bicarbonate in 1 L of deionized water, put it in a stainless steel tank, and stir it with a magnetic stirrer to fully dissolve it.

[0038] (3) Magnesium alloy micr...

Embodiment 2

[0043] (1) Pretreatment: Cut a sample with a size of 20mm×20mm×1mm from a magnesium alloy sheet of model AZ91D, and use 150#, 400#, 600#, 800#, 1200#, 2000# SiC sandpaper to The surface of the magnesium-aluminum alloy is polished until the direction of the scratch is consistent, and then it is cleaned with acetone, absolute ethanol, and deionized water in an ultrasonic wave for 10 minutes to remove oil stains, and then dried for later use.

[0044] (2) Prepare the electrolyte: weigh 15g of sodium silicate, 20g of sodium hexametaphosphate, 10g of potassium fluoride, 8g of ammonium metavanadate, 1g of sodium hydroxide, 1g of EDTA (ethylenediaminetetraacetic acid), lemon Dissolve 2 g of sodium bicarbonate in 1 L of deionized water, put it in a stainless steel tank, and stir it with a magnetic stirrer to fully dissolve it.

[0045] (3) Magnesium alloy micro-arc oxidation coloring

[0046] The magnesium alloy sample after the above pretreatment is used as the anode, and is complet...

Embodiment 3

[0050] (1) Pretreatment: Cut a sample with a size of 20mm×20mm×1mm from a magnesium alloy sheet of model AZ91D, and use 150#, 400#, 600#, 800#, 1200#, 2000# SiC sandpaper to The surface of the magnesium-aluminum alloy is polished until the direction of the scratch is consistent, and then it is cleaned with acetone, absolute ethanol, and deionized water in an ultrasonic wave for 10 minutes to remove oil stains, and then dried for later use.

[0051] (2) Prepare the electrolyte: weigh 36g of sodium silicate, 37.5g of sodium hexametaphosphate, 24g of potassium fluoride, 18g of ammonium metavanadate, 3g of sodium hydroxide, and 6g of EDTA (ethylenediaminetetraacetic acid) at room temperature. Dissolve 6g of sodium citrate in 1L of deionized water, put it in a stainless steel tank, and stir it with a magnetic stirrer to fully dissolve it.

[0052] (3) Magnesium alloy micro-arc oxidation coloring

[0053] The magnesium alloy sample after the above pretreatment is used as the anode,...

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Abstract

The invention relates to a micro-arc oxidation smooth black ceramic film on a magnesium alloy and a preparation method thereof. The preparation method comprises the following steps: sanding the magnesium alloy with SIC abrasive paper; then deoiling and cleaning the magnesium alloy and blowing the same with an electric fan, and putting the magnesium alloy in a drier for later use; and soaking the pre-treated magnesium alloy in an electrolyte by taking the magnesium alloy as an anode and a stainless steel thin plate as a cathode, carrying out first and second section micro-arc oxidation treatment on the magnesium alloy in a bipolar pulse constant current mode, taking out the magnesium alloy and cleaning the magnesium alloy with deionized water, and drying the magnesium alloy to obtain a black ceramic film. By adopting the two section micro-arc oxidation treatment, the black ceramic layer which is smaller in roughness, good in corrosion resistance, small in black degree, uniform in colorand luster and firmer to combine with a film base can be generated on the surface of the magnesium alloy under a lower current density by means of two section electric parameters. The micro-arc oxidation smooth black ceramic film has the advantages of being high in film quality, high in preparation efficiency, low in unit energy consumption and the like.

Description

technical field [0001] The invention belongs to the field of magnesium alloy surface treatment, in particular to a smooth micro-arc oxidation black ceramic film of magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy is the lightest metal structure material. It has the advantages of light specific gravity, high specific strength, good vibration damping, strong electromagnetic shielding, and easy recycling. It is considered to be the most potential development and application in the 21st century. "Material. In recent years, with the rapid popularization of 3C electronic products, their shells have also undergone upgrading, and the original engineering plastics with poor texture have gradually developed into metal materials. Among the common metal materials, magnesium alloy has the advantages of low density, high specific strength and high rigidity, which can provide sufficient protection while meeting the requirements of light weigh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30
CPCC25D11/026C25D11/30
Inventor 李文芳易爱华祝闻王康廖忠淼田君李润霞
Owner DONGGUAN UNIV OF TECH
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