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Magnesium alloy microarc oxidation low energy consumption black ceramic coating and preparation method thereof

A technology of micro-arc oxidation and black ceramics, which is applied in the direction of anodic oxidation, etc., can solve the problems of difficult treatment of electrolyte waste, limited industrialization promotion, poor bonding performance, etc., and achieves small color difference, good corrosion resistance and high casting performance. Effect

Inactive Publication Date: 2013-06-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 sealed with resin or coating , making the process more cumbersome ; (2) Electrolyte waste liquid is difficult to handle, etc.
However, there are also some problems in micro-arc oxidation, especially the problem of high energy consumption, which has always limited the industrialization of this technology.

Method used

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  • Magnesium alloy microarc oxidation low energy consumption black ceramic coating and preparation method thereof
  • Magnesium alloy microarc oxidation low energy consumption black ceramic coating and preparation method thereof
  • Magnesium alloy microarc oxidation low energy consumption black ceramic coating and preparation method thereof

Examples

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Effect test

Embodiment 1

[0036] The preparation method of magnesium alloy micro-arc oxidation low-energy black film includes the following steps:

[0037] (1) Pretreatment: Take a sample with a thickness of 10mm from a magnesium alloy rod of model AZ91D (30mm in diameter), and use 150 # , 400 # , 600 # , 800 # Grind the surface of the magnesium-aluminum alloy with SiC sandpaper to the same scratch direction, then wash with acetone, absolute ethanol, and deionized water in ultrasonic for 10 minutes, and blow dry for later use. The purpose of pre-treatment of magnesium alloy is to remove oxides and oil stains on the surface of magnesium alloy.

[0038] (2) Prepare electrolyte: weigh 10g sodium silicate, 10g sodium hexametacitrate, 10g potassium fluoride, 8g ammonium metavanadate, 1g sodium hydroxide, 1g EDTA (ethylenediaminetetraacetic acid) at room temperature, Dissolve 2g of sodium citrate in 1L of deionized water and stir it with a magnetic stirrer to fully dissolve it.

[0039] Magnesium alloy micro-arc o...

Embodiment 2

[0044] (1) Pre-treatment: Same as Example 1.

[0045] (2) Prepare electrolyte: weigh 30g of sodium silicate, 25g of sodium hexametacitrate, 15g of potassium fluoride, 12g of ammonium metavanadate, 1g of sodium hydroxide, 4g of EDTA (ethylenediaminetetraacetic acid) at room temperature, 6g of sodium citrate was dissolved in 1L of deionized water, and stirred with a magnetic stirrer to fully dissolve it.

[0046] Magnesium alloy micro-arc oxidation coloring

[0047] The magnesium alloy sample after the above pretreatment is used as the anode, and is completely immersed in the above configured electrolyte, the stainless steel sheet is used as the cathode, fixed at a distance of 5 cm from the anode with a clamp, and the magnesium alloy is micro-arced by an AC pulse power supply Oxidation treatment; the power supply adopts constant current mode, the electrical parameters are: current density 6.37A / dm2, frequency 600Hz, duty ratio 20%, positive-negative pulse ratio 7:1, oxidation time 8mi...

Embodiment 3

[0051] (1) Pre-treatment: Same as Example 1.

[0052] (2) Preparation of electrolyte: weigh 15g of sodium silicate, 25g of sodium hexametacitrate, 12g of potassium fluoride, 10g of ammonium metavanadate, and 1g of sodium hydroxide at room temperature, dissolve them into 1L of deionized water, and stir with magnetic force. Stir the device to fully dissolve it.

[0053] Magnesium alloy micro-arc oxidation coloring

[0054] The magnesium alloy sample after the above pretreatment is used as the anode, and is completely immersed in the above configured electrolyte, the stainless steel sheet is used as the cathode, fixed at a distance of 5 cm from the anode with a clamp, and the magnesium alloy is micro-arced by an AC pulse power supply Oxidation treatment; the power supply adopts constant current mode, the electrical parameters are: current density 6.37A / dm2, frequency 600Hz, duty ratio 20%, positive-negative pulse ratio 7:1, oxidation time 8min, after setting the parameters, proceed to ...

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Abstract

The invention discloses a magnesium alloy microarc oxidation low energy consumption black ceramic coating and a preparation method thereof. The preparation method comprises the following steps of: grinding magnesium alloy by using SiC sand paper, cleaning and drying with hot air, and standing in a drier for later use; and immersing the pre-treated magnesium alloy in electrolyte by using the magnesium alloy as an anode and a stainless steel thin plate as a cathode, and performing a microarc oxidation treatment on the magnesium alloy by adopting an alternating-current constant-current mode, taking out the magnesium alloy and cleaning with deionized water, and drying with hot air to prepare the required microarc oxidation black ceramic coating. Under a condition of lower working voltage (less than or equal to 300V), the black ceramic coating with good corrosion resistance and uniform color can be generated on the surface of magnesium alloy, and is high in efficiency, low in unit energy consumption and small in environmental pollution.

Description

technical field [0001] The invention relates to the field of magnesium alloy surface treatment, in particular to a low-energy micro-arc oxidation black ceramic film of Mg 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. However, the standard electrode potential of magnesium is low (-2.36V), and it is easy to lose electrons to cause oxidation reaction, which leads to poor corrosion resistance of magnesium and magnesium alloys, and severe corrosion is easy to occur in corrosive media. As we all know, surface treatment is one of the most effective, reasonable and widely used treatment methods to improve the corrosion resistance of magnesium alloys. A...

Claims

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Application Information

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IPC IPC(8): C25D11/30
Inventor 李文芳万小芳于非张果戈
Owner SOUTH CHINA UNIV OF TECH
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