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Differential arc oxidation electrolytic solution and differential arc oxidation method

A technology of micro-arc oxidation and electrolyte, which is applied in anodic oxidation and other directions

Active Publication Date: 2010-10-06
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 poor adhesion of the colored layer on the surface of the micro-arc oxidation film in the prior art, the defects of poor decorative effect and complicated process, and provide a kind of Electrolyte that forms a colored micro-arc oxidation film with good adhesion to the substrate and simple process, and also provides a method for micro-arc oxidation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[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 amp / dm2 current density for micro-arc oxidation for 5 minutes, take it out and clean it with pure water after completion. Th...

Embodiment 2

[0049] Example 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. Under the condition of 25°C, the voltage of 0-600 volts and the current density of 0-10 ampere / dm2 were used for micro-arc oxidation for 30 minutes, and then washed with pure water.

Embodiment 3

[0052] Comparative example 1

[0053] Degrease the magnesium alloy workpiece according to the method described in Example 1, except that the electrolyte is an aqueous solution containing 20 g / L of sodium hexametaphosphate, 5 g / L of sodium borate, and an appropriate amount of stabilizer. The arcing voltage is 100v, and the initial current density is 5A / dm 2 , then quickly drop to 1A / dm 2 After 10 minutes, a layer of 10-15 micron micro-arc oxidation film is formed on the shell, and then colored in a dyeing tank with a dyeing agent. The coloring temperature is 60°C, and the time is 3 minutes. The coloring agent is red coloring agent, 3 Wash and dry in minutes.

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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 valueand 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 Patents(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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