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Electrolyzing solution, method and application for micro-arc oxidation

A micro-arc oxidation and electrolyte technology, applied in anodizing and other directions, can solve the problems of film performance influence, assembly difficulty, influence on the dimensional accuracy of parts, etc., and achieve the effect of improving corrosion resistance and good density.

Active Publication Date: 2017-06-23
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the thickness of the dense layer increases, the rate of increase in the thickness of the loose layer may be higher than that of the dense layer, that is, a thicker loose layer will be obtained; this will affect the properties of the film layer, such as the roughness of the film layer
In addition, for parts with high size requirements, the film layer is too thick, which will affect the accuracy of the parts size and cause subsequent assembly difficulties and other problems

Method used

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  • Electrolyzing solution, method and application for micro-arc oxidation
  • Electrolyzing solution, method and application for micro-arc oxidation
  • Electrolyzing solution, method and application for micro-arc oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This example takes LY12 aluminum alloy material as an example for micro-arc oxidation, and the size of the aluminum alloy is 25×50×2mm 3 .

[0039] In the electrolyte of this example, sodium hexametaphosphate is used as the phosphate, ferric ammonium oxalate is used as the iron-containing compound, and disodium edetate (i.e. Na 2 EDTA), the electrolyte preparation method is as follows: Weigh sodium hexametaphosphate, ferric ammonium oxalate and Na 2 EDTA, add it to distilled water and stir to dissolve. Make sodium hexametaphosphate final concentration be 15g / L, ferric ammonium oxalate final concentration be 5g / L, Na 2 The final concentration of EDTA is 5g / L. That is, the electrolyte solution of this example is obtained.

[0040] The micro-arc oxidation method in this example includes:

[0041] 1) Pretreatment: Grinding the aluminum alloy, removing burrs on the surface and corners of the alloy with sandpaper, removing foreign matter on the surface, and reducing the ...

Embodiment 2

[0049] In this example, the same LY12 aluminum alloy material as in Example 1 was used for micro-arc oxidation. The difference is that in the electrolyte of this example, the final concentration of phosphate sodium hexametaphosphate is 10g / L, and the iron-containing compound adopts ferric ammonium citrate with a final concentration of 5g / L, and the complexing agent Na 2 The final concentration of EDTA was 7g / L. In addition, in the micro-arc oxidation method, the current density of the constant current mode is 8A / dm 2 , frequency 200Hz, response time 15min. All the other are the same as the first embodiment.

[0050] The micro-arc oxidation-treated aluminum alloy of this example was observed by scanning electron microscopy, and the results showed that a dense film was formed on the surface of the aluminum alloy with a film thickness of 25 μm. EDS found P and Fe elements in the film layer. Also use salt spray corrosion to test the corrosion resistance of the aluminum alloy t...

Embodiment 3

[0052] In this example, 6063 aluminum alloy material is used as an example for micro-arc oxidation. The size of the aluminum alloy is 25×50×2mm 3 . In the electrolyte of this example, the final concentration of phosphate sodium hexametaphosphate is 15g / L, what the iron-containing compound adopts is ferric nitrate whose final concentration is 4g / L, and what the complexing agent adopts is that the final concentration is 5mL / L Triethanolamine and Na at a final concentration of 5 g / L 2 EDTA. In addition, in the micro-arc oxidation method, the pulse power supply adopts a constant voltage mode, with a voltage of 450V, a frequency of 500Hz, and a response time of 10min. All the other are the same as the first embodiment.

[0053] The micro-arc oxidation-treated aluminum alloy of this example was observed by scanning electron microscopy, and the results showed that a dense film was formed on the surface of the aluminum alloy with a film thickness of 15 μm. EDS found P and Fe eleme...

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Abstract

The invention discloses an electrolyzing solution, method and application for micro-arc oxidation. The electrolyzing solution for micro-arc oxidation comprises phosphates with the final concentration being 5-50 g / L, iron containing compounds with the final concentration being 1-15 g / L and complexing agents with the final concentration being 1-10 g / L, and distilled water serves as solvents. The iron containing compounds are ferrous compounds and / or ferric compounds. According to the electrolyzing solution for micro-arc oxidation, the phosphates, the iron containing compounds and the complexing agents are dissolved in water, not only is the using requirement of the electrolyzing solution for the micro-arc oxidation met, but also the phosphates subjected to phosphating are introduced into the electrolyzing solution, and phosphating and the micro-arc oxidation are combined, so that an obtained film layer subjected to the micro-arc oxidation through the electrolyzing solution has better density, and accordingly corrosion resistance performance of a treated workpiece is improved.

Description

technical field [0001] The application relates to the field of surface modification of alloy materials, in particular to an electrolyte for micro-arc oxidation, a micro-arc oxidation method and its application. Background technique [0002] In recent years, with the rapid development of automobile industry, military defense, aerospace, medical equipment and daily 3C products and other fields, people have increasingly stringent requirements on the performance of new materials. Aluminum alloy is widely used because of its high specific strength, easy processing and low price. However, in order to meet more stringent application requirements, the performance of aluminum alloys is also being continuously improved. Among them, the corrosion resistance of aluminum alloys has always been one of the important indicators to measure its application prospects. [0003] At present, there are many methods used to improve the corrosion resistance of aluminum alloys, such as sacrificial a...

Claims

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Application Information

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IPC IPC(8): C25D11/06C25D5/18
CPCC25D5/18C25D11/06
Inventor 吴忠振季顺平翁宇昌马正永林海潘锋
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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