Differential arc oxidation electrolytic solution and differential arc oxidation method

A technology of micro-arc oxidation and electrolyte, which is applied in the direction of anodic oxidation, etc., can solve the problems of poor decoration effect, poor adhesion of the coloring layer on the surface of micro-arc oxidation film, complicated process, etc., and achieve good stain resistance, compactness and beautiful appearance Decorative effect, uniform color effect

Active Publication Date: 2009-07-08
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the defects of poor adhesion of the coloring layer on the surface of the micro-arc oxidation film in the above-mentioned prior art, poor decorative effect and complicated process, and provide a color micro-arc oxidation film capable of forming a color micro-arc oxidation film with good adhesion to the substrate and simple process. Membrane electrolyte, also provides a method of micro-arc oxidation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Processing workpiece: Magnesium alloy mobile phone battery cover

[0040] Material model: AB92D

[0041] 1. Pretreatment

[0042] Soak the above-mentioned magnesium 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.

[0043] 2. Micro-arc oxidation

[0044] Immerse the degreased magnesium alloy workpiece in sodium silicate 5g / L, potassium fluoride 5g / L, potassium hydroxide 5g / L, sodium sulfate 0.15g / L, copper pyrophosphate 0.17g / L, copper sulfate 0.04g / L , EDTA0.025g / L, potassium sodium tartrate 0.14g / L micro-arc oxidation electrolyte, the magnesium alloy workpiece as the anode, the stainless steel plate as the cathode, under the condition of about 25 ℃ using a voltage of 0-600 volts, 0 -10 Amps / dm 2 Micro-a...

Embodiment 2

[0047] After degreasing the magnesium alloy, immerse it in a solution containing sodium silicate 5g / L, potassium fluoride 2.5g / L, potassium hydroxide 5g / L, sodium sulfate 0.15g / L, copper pyrophosphate 0.34g / L, copper sulfate 0.08 g / L, EDTA0.05g / L, potassium sodium tartrate 0.28g / L solution, magnesium alloy as anode, stainless steel plate as cathode, voltage of 0-600 volts at 25°C, 0-10 amperes / dm 2 The current density was subjected to micro-arc oxidation for 10 minutes, and then washed with pure water. The above-mentioned magnesium alloy workpiece after micro-arc oxidation was immersed in hot pure water at a temperature of 85° C. to seal for 5 minutes, and then taken out and blown dry.

[0048] A magnesium alloy product with a micro-arc oxidation film with a thickness of 15 microns was finally obtained as measured by a microscope of the DMM-660D model of Shanghai Caikang Instrument Co., Ltd. After testing with a Minolta CR10 colorimeter, it was confirmed that a deep pink mi...

Embodiment 3

[0050] According to the method described in Example 1, the aluminum alloy workpiece is subjected to micro-arc oxidation, and the difference is that the electrolyte contains sodium silicate 5g / L, potassium fluoride 5g / L, potassium hydroxide 5g / L, and sodium sulfate 0.9g / L, copper pyrophosphate 2g / L, copper sulfate 0.5g / L, EDTA 0.3g / L, potassium sodium tartrate 0.5g / L solution. 0-600 volts, 0-10 amps / dm at 25°C 2 The current density was subjected to micro-arc oxidation for 30 minutes, and then washed with pure water.

[0051] The magnesium alloy product with a micro-arc oxidation film with a thickness of 30 microns was finally obtained by using the DMM-660D microscope of Shanghai Caikang Instrument Co., Ltd. After testing with a Minolta CR10 color difference meter, it was confirmed that the final pink micro-arc oxidation film was obtained .

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PUM

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Abstract

The invention provides a micro-arc oxidation electrolyte which is a water solution comprises phosphate and silicate, and has 6-12 PH value. The electrolyte has characteristics that the electrolyte also comprises colorant, the colorant comprises A and B components, wherein, A comprises one or some of potassium fluoride, sodium fluoride, sodium sulfate and borax, B comprises cupric pyrophosphate and/or bluestone. The micro-arc oxidation electrolyte and the method for micro-art oxidating provided by the invention can make micro-arc oxidation film of light metal material obtaining uniform color for having beautiful decorating effect. At the same time, the obtained micro-arc oxidation film of light metal material surface has better stain resistance and compactness that increases additive value and practical using value of magnesium alloy greatly.

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 林军赵南王磊胡国兵罗茂盛王强林宏业宫清
Owner BYD CO LTD
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