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Micro arc oxidation electrolytic solution for light metals and micro arc oxidation method

A technology of micro-arc oxidation and electrolyte, applied in anodic oxidation, etc., can solve the problems of poor scratch resistance and compactness, achieve good scratch resistance and compactness, high corrosion resistance and electrical insulation, and increase added value Effect

Active Publication Date: 2008-11-26
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to overcome the defects that the micro-arc oxidation electrolyte on the surface of the aluminum alloy makes the micro-arc oxidation film on the surface of the aluminum alloy poor in stain resistance, scratch resistance and compactness, and to provide a micro-arc oxidation method that makes the surface of the light metal Electrolyte for light metal micro-arc oxidation with better stain resistance, scratch resistance and compactness of oxide film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This example illustrates the micro-arc oxidation electrolyte and the micro-arc oxidation method provided by the present invention.

[0028] Processing workpiece: aluminum alloy mobile phone battery cover

[0029] Material model: A16063

[0030] 1. Degreasing

[0031] The above-mentioned aluminum alloy workpiece is immersed in an alkaline solution containing 30 g / L sodium hydroxide, 40 g / L sodium phosphate, and 20 g / L sodium silicate to degrease the aluminum alloy base material. The degreasing temperature is 85° C., and the degreasing time is 8 minutes. Then wash with water for 5 minutes.

[0032] 2. Micro-arc oxidation: Immerse the above-mentioned degreased aluminum alloy workpiece into an electrolyte containing 25 g / L of sodium hexametaphosphate, 8 g / L of sodium silicate, 8 g / L of ammonium metavanadate, and 2 g / L of cobalt sulfate solution, and adjust the pH value to about 7.8 with 1.5 g / L sodium hydroxide. The aluminum alloy workpiece is used as the anode, the st...

Embodiment 2

[0037] This example illustrates the micro-arc oxidation electrolyte and the micro-arc oxidation method provided by the present invention.

[0038] Carry out micro-arc oxidation to the workpiece according to the method described in Example 1, the difference is that the electrolyte contains 25 grams per liter of sodium hexametaphosphate, 8 grams per liter of sodium silicate, 8 grams per liter of ammonium metavanadate, cobalt sulfate 2 g / L, glycerol 10 mL / L, sodium tungstate 1 g / L aqueous solution, the time of micro-arc oxidation is 10 minutes.

[0039] A product with a black micro-arc oxidation film was obtained, and the thickness of the formed film measured by a coating thickness gauge (PHYNIX, Pocket-Surfix, Germany) was 15 microns.

Embodiment 3

[0041] According to the method described in Example 1, the aluminum alloy workpiece is subjected to micro-arc oxidation. The difference is that the electrolyte contains 40 grams / liter of sodium hexametaphosphate, 10 grams / liter of sodium aluminate, 5 grams / liter of sodium silicate, and 5 grams / liter of metasilicate. An aqueous solution of 20 g / L ammonium vanadate, 0.1 g / L cobalt sulfate, 5 g / L sodium phosphate, 1 mL / L ethylenediamine, and 0.3 g / L sodium molybdate; the micro-arc oxidation time is 35 minutes.

[0042]Obtain the product that is attached to the aluminum alloy workpiece of black micro-arc oxidation film, measure the thickness of the formed film with coating thickness gauge (Germany PHYNIX company, Pocket-Surfix) and be 40 microns.

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Abstract

The invention provides an electrolyte used for micro-arc oxidation of light metal. The electrolyte is aqueous solution containing sodium hexametahposphate and sodium silicate, wherein, the electrolyte also contains cobalt sulfate and ammonium metavanadate. The invention also provides a method of micro-arc oxidation by adopting the electrolyte. By adopting the electrolyte and the micro-arc oxidation method provided by the invention, light metal products with good pollution resistance, scrape resistance and compactness can be obtained.

Description

technical field [0001] The invention relates to an electrolytic solution for micro-arc oxidation of light metals, and also relates to a method for micro-arc oxidation of light metals using the electrolytic solution. Background technique [0002] At present, light metal materials, such as aluminum and aluminum alloys, magnesium, titanium and their alloys, are widely used in aerospace, aviation, automobiles, construction and electronics due to their light weight, high specific strength, good rollability, ductility, and easy processing. industry. But the fly in the ointment is that the surface of light metal is soft, not resistant to wear and high temperature, and especially the corrosion potential of aluminum is low, and the overall corrosion is more serious. In order to overcome the defects of light metal surface performance, expand the application range and prolong the service life, it is necessary to oxidize the surface of light metal materials to form a protective film on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/06
Inventor 宫清陈梁林军
Owner BYD CO LTD
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