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Electrolyte for micro-arc oxidation of magnesium alloys

A micro-arc oxidation and electrolyte technology, applied in anodizing and other directions, can solve the problem of increasing the process complexity of the water washing process in the micro-arc-electrophoresis production line, unable to meet the aesthetic requirements of electronic product shell materials, and the color of the micro-arc oxidation film layer. Single problem, to achieve the effect of shortening the production line process, reducing the complexity of the process, and reducing the production cost

Inactive Publication Date: 2014-11-05
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this kind of electrolyte for micro-arc oxidation, the biggest problem is that it increases the process complexity of the washing process in the micro-arc-electrophoresis production line, and the prepared micro-arc oxidation film has a single color and poor decorative effect, which cannot meet the expectations of social groups. Aesthetic requirements for housing materials of electronic products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of electrolyte: slowly add 30g / L sodium hexametaphosphate into deionized water and stir until completely dissolved, then add 8g / L potassium fluoride, stir evenly, then add 6g / L ammonium metavanadate to the above solution , and finally add an appropriate amount of potassium hydroxide to adjust the pH to 8.5.

[0030] Preparation steps of colored magnesium alloy micro-arc oxidation ceramic layer:

[0031] (1) Take the AZ31B magnesium alloy sample with a specification of 50mm×50mm×3mm that has a white micro-arc oxidation film layer with a thickness of 8 μm;

[0032] (2) AZ31B magnesium alloy sample is used as anode, and stainless steel plate is used as cathode;

[0033] (3) Make micro-arc oxidation electrolyte with the electrolyte prepared above;

[0034] (4) Turn on the cooling device to ensure that the temperature of the electrolyte is kept at 30-40°C;

[0035] (5) Check the line connection of the whole circuit, press 2.5A / dm 2 Set the average current, an...

Embodiment 2

[0041] Preparation of electrolyte: add 50g / L sodium hexametaphosphate into deionized water and stir until completely dissolved, then add 12g / L sodium fluoride, stir evenly, then add 2g / L ammonium metavanadate to the above solution, Finally, an appropriate amount of sodium hydroxide was added to adjust the pH value to 10.

[0042] Preparation steps of colored magnesium alloy micro-arc oxidation ceramic layer:

[0043] (1) Take the AZ31B magnesium alloy sample with a specification of 50mm×50mm×3mm that has a white micro-arc oxidation film layer with a thickness of 9 μm;

[0044] (2) AZ31B magnesium alloy sample is used as anode, and stainless steel plate is used as cathode;

[0045] (3) Make micro-arc oxidation electrolyte with the electrolyte prepared above;

[0046] (4) Turn on the cooling device to ensure that the temperature of the electrolyte is kept at 30-40°C;

[0047] (5) Check the line connection of the whole circuit, press 1.5A / dm 2 Set the average current, and the...

Embodiment 3

[0053]Preparation of electrolyte: Add 70g / L sodium hexametaphosphate into deionized water and stir until completely dissolved, then add 2g / L potassium fluoride, stir evenly, then add 10g / L ammonium vanadate to the above solution, and finally Add appropriate amount of potassium hydroxide to adjust the pH to 10.

[0054] Preparation steps of colored magnesium alloy micro-arc oxidation ceramic layer:

[0055] (1) Take an AZ31B magnesium alloy sample with a specification of 50mm×50mm×3mm and a white micro-arc oxidation film layer with a thickness of 10 μm;

[0056] (2) AZ31B magnesium alloy sample is used as anode, and stainless steel plate is used as cathode;

[0057] (3) Make micro-arc oxidation electrolyte with the electrolyte prepared above;

[0058] (4) Turn on the cooling device to ensure that the temperature of the electrolyte is kept at 30-40°C;

[0059] (5) Check the line connection of the whole circuit, press 3A / dm 2 Set the average current, and the micro-arc oxidati...

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Abstract

The invention discloses an electrolyte for micro-arc oxidation of magnesium alloys to prepare ceramic layers, and a corresponding process method thereof. The electrolyte contains deionized water, sodium hexametaphosphate and additives, wherein the additives mainly include fluorides, a colorant and alkali metal hydroxides. The content of the sodium hexametaphosphate is 30-70 g / L, the content of the fluorides is 2-12 g / L, the content of the colorant is 2-10 g / L, and the pH value of the electrolyte is 7-10. The electrolyte is relatively low in system alkalinity, is a weak alkaline electrolyte for micro-arc oxidation, and can effectively reduce the process complexity of a water washing process in a micro-arc-electrophoresis production line, shorten the production line process, reduce the sewage discharge, and reduce the production cost; and once the electrolyte provided by the invention is adopted for carrying out the micro-arc oxidation of magnesium alloys, prepared ceramic layers have beautiful and decorative properties, so that a problem that ceramic layers prepared through the micro-arc oxidation of magnesium alloys are single in color is solved.

Description

technical field [0001] The invention belongs to the field of light metal surface treatment, and in particular relates to an electrolyte for micro-arc oxidation of magnesium alloys and a process method thereof. Background technique [0002] Magnesium alloy has the characteristics of low density, high specific stiffness and specific strength, large energy attenuation coefficient and auxiliary heat dissipation performance. It is a priority alternative material in the development process of "lightweight" in the manufacturing industry. However, its electrode potential is relatively negative and its corrosion resistance is poor, so proper surface treatment must be applied, otherwise it is difficult to meet the surface protection performance requirements of anti-corrosion and anti-scratch. [0003] Micro-arc oxidation is a light metal surface treatment technology. Its principle is to form a layer of oxide ceramic layer in situ on the surface of aluminum, magnesium, etc., which act ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30
Inventor 蒋百铃邵文婷李洪涛房爱存房昊炜张超
Owner NANJING UNIV OF TECH
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