Method for coating aluminum alloy by using micro-arc oxidation green film layer

A technology of micro-arc oxidation and aluminum alloy, which is applied in the direction of anodic oxidation, etc., can solve the problems of corrosion resistance to be improved, micro-arc oxidation film stain resistance, scratch resistance and poor compactness, etc., to achieve low porosity and high hardness , the effect of uniform film layer

Active Publication Date: 2015-08-12
SHANDONG UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, after using the electrolytic solution provided by the invention to carry out micro-arc oxidation on aluminum alloy, the obtained micro-arc oxidation film has poor stain resistance, scratch resistance and compactness.
Chinese patent CN102797024B discloses a method for micro-arc oxidation of aluminum alloy to form a blue film. The composition concentration of the electrolyte is: sodium silicate 5-11g / L, potassium hydroxide 0.5-2.0g / L; sodium fluoride 0.3 -0.6g / L, cobalt sulfate 0.4-1.1g / L, the aluminum alloy treated by this method has a blue surface and is uniform and dense, but the corrosion resistance needs to be improved

Method used

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  • Method for coating aluminum alloy by using micro-arc oxidation green film layer
  • Method for coating aluminum alloy by using micro-arc oxidation green film layer
  • Method for coating aluminum alloy by using micro-arc oxidation green film layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The present invention selects 6063 aluminum alloy as the base material, its chemical composition is shown in Table 1, and the chemical reagents used in the test are shown in Table 2.

[0050] Table 1 Composition of 6063 aluminum alloy (wt%)

[0051]

[0052] Table 2 Chemical reagents used in the test

[0053]

[0054] In the present invention, the 6063 aluminum plate is cut into 7mm * 7mm * 12mm cuboid fritters on the wire electric discharge machine, drills a hole (Ф2.5mm) on one side of it with a drilling machine, taps with the tap corresponding to the hole, In order to facilitate the tight connection with the tapped aluminum wire during the micro-arc oxidation reaction process, it is ensured that the sample will not fall off during the reaction process. The sample was polished on SiC sandpaper of different thicknesses, starting from 400# coarse sandpaper, and then polished 5 times until fine 1000#. Soak the sample in alcohol to get rid of the grease on its sur...

Embodiment 2

[0057] Changing the concentration of ammonium metavanadate in Example 1 to 5 g / L, and keeping other parameters unchanged, the color of the obtained film layer A1 is very uneven, and many parts appear black.

Embodiment 3

[0059] Changing the concentration of ammonium metavanadate in Example 1 to 7g / L, and keeping other parameters unchanged, the color of the obtained film layer A3 is dark green and the surface is relatively smooth.

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Abstract

The invention relates to a method for coating aluminum alloy by using a micro-arc oxidation green film layer. The method comprises the following steps of using the 6063 aluminum alloy as a matrix; adding glycerinum and potassium fluoride (KF) in a system in which Na2SiO3-KOH serves as main electrolyte; preparing coloring electrolyte by using NH4VO3 as coloring agents; and preparing a green micro-arc oxidation ceramic film layer. Influences of electrolyte parameters and electric parameters on an organization structure and the performance of the micro-arc oxidation film layer are researched. Phase composition, microstructure and element contents of the film layer are respectively represented through an X-ray diffractometer (XRD), a scanning electron microscope (SEM) and an energy dispersive spectrometer (EDS), the thickness of the micro-arc oxidation ceramic layer and the strength of bonding between the micro-arc oxidation ceramic layer and the matrix are detected by an eddy coating thickness gage and a scratch spectrometer, the electrochemistry corrosion resisting property of the ceramic layer is analyzed by using an electrochemical corrosion method, technological parameters are optimized, and a green micro-arc oxidation film with high performance is prepared.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to a method for forming a green film layer by micro-arc oxidation of an aluminum alloy. Background technique [0002] Aluminum is an active metal, and a layer of loose and porous aluminum oxide film will be formed immediately on its surface in dry air. Although it can prevent the further oxidation of aluminum, it cannot effectively play the role of protection and decoration. At the same time, the electrode potential of aluminum is low, which makes it easily corroded in humid air, acid and lye. Therefore, it is of great practical application value to prepare a layer of film with color and certain protective properties on the surface of aluminum and its aluminum alloys. [0003] The new coloring technologies on the surface of aluminum and its alloys include: chemical conversion coating technology, electrophoresis technology, powder electrostatic spraying technology and micro-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/06
Inventor 于慧君赵天盖陈传忠王佃刚
Owner SHANDONG UNIV
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