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Micro-arc oxidation electrolyte and micro-arc oxidation method

A technology of micro-arc oxidation and electrolyte, applied in the direction of anodic oxidation, etc., can solve the problems of uneven color, poor adhesion, etc., and achieve the effect of uniform color, good stain resistance and compactness, and beautiful decorative effect

Inactive Publication Date: 2009-06-03
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects of uneven color and poor adhesion on the surface of the micro-arc oxidation film in the above-mentioned prior art, and provide a method that can form a colored micro-arc oxidation film and the color of the color micro-arc oxidation film surface is uniform, Electrolyte for micro-arc oxidation with good adhesion, also provides a method for micro-arc oxidation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Handling workpiece: aluminum alloy mobile phone battery cover; material model: A16061

[0031] 1. Pretreatment

[0032] Soak the above-mentioned aluminum alloy workpiece in the degreasing solution for 10 minutes, and then rinse it with water. The degreasing solution is an aqueous solution containing 30 grams / liter of sodium hydroxide, 40 grams / liter of sodium phosphate and 20 grams / liter of sodium silicate, and the temperature of the degreasing solution is 70° C.

[0033] 2. Micro-arc oxidation

[0034] Immerse the degreased aluminum alloy workpiece in the micro-arc oxidation electrolyte, use the aluminum alloy workpiece as the anode, and the stainless steel plate as the cathode, and apply a voltage of 0-600 volts at a temperature of about 25°C, 5A / dm 2 Micro-arc oxidation at a current density of 10 minutes, after completion, take it out and clean it with pure water. The micro-arc oxidation electrolyte is an aqueous solution containing 20 g / L of sodium hexametaphosph...

Embodiment 2

[0041] Carry out micro-arc oxidation to aluminum alloy workpiece according to the method described in embodiment 1, difference is, micro-arc oxidation electrolyte is to contain sodium hexametaphosphate 10g / L, sodium trimetaphosphate 12.5g / L, cobalt sulfate 6g / L aqueous solution; the time of micro-arc oxidation is 7 minutes.

[0042] Finally, an aluminum alloy product with a brown micro-arc oxidation film with a thickness of 8 microns was obtained. Visually, the color was uniform.

Embodiment 3

[0044] According to the method described in embodiment 1, aluminum alloy workpiece is carried out micro-arc oxidation, and difference is, electrolytic solution is to contain sodium hexametaphosphate 10g / L, sodium trimetaphosphate 12.5g / L, the aqueous solution of cobalt sulfate 4g / L; The time of micro-arc oxidation is 4 minutes.

[0045] Finally, an aluminum alloy product with a blue-brown speckled micro-arc oxidation film with a thickness of 6 micrometers attached was obtained. Visually, the color was uniform.

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Abstract

The invention provides a micro-arc oxidation electrolyte which is aqueous solution containing phosphate and silicate and has the pH value of 6-12, wherein, the electrolyte also contains color toner which comprises one or a plurality of sodium sulfate, rose vitriol, ammonium metavanadate, copper sulphate and potassium permanganate. The micro-arc oxidation electrolyte and a micro-arc oxidation method provided by the invention can lead a micro-arc oxidation film made of light metal materials to obtain multiple colors which are very even to ensure the light metal products to have beautiful decorative effects. Meanwhile, the stain resistance and compactness of the micro-arc oxidation film obtained on the light metal materials are excellent; therefore, the added value and actual use value of aluminium alloy are greatly enhanced.

Description

technical field [0001] The invention relates to an electrolytic solution for micro-arc oxidation, and also relates to a method for micro-arc oxidation. Background technique [0002] At present, light metal materials, such as aluminum, magnesium, titanium and their alloys, are widely used in aerospace, aviation, automobile, construction and electronics industries due to their light weight, high specific strength, good rollability and ductility, and easy processing. 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 the surface to solve or improve the surface performance and decorative functions....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/02
Inventor 林军赵南王磊王鑫林宏业宫清
Owner BYD CO LTD
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