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Electrolyte and preparation method of magnesium alloy composite oxide black ceramic membrane

An electrolyte and magnesium alloy technology, applied in the field of metal surface treatment, can solve the problems of long electrolysis time, high power consumption of the process, rough surface of the film layer, etc.

Active Publication Date: 2021-04-16
斯特凯新材料(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, currently in the black surface treatment of magnesium alloys, the use of copper salt as the coloring salt has the problem of copper deposition on the cathode plate, which affects the stability of the bath. The black is yellowish, brownish yellow
The composite oxidation electrolyte using iron salt as the coloring salt can achieve black color, but the surface of the film layer is rough, the electrolysis time is long, and the power consumption of the process is high.

Method used

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  • Electrolyte and preparation method of magnesium alloy composite oxide black ceramic membrane

Examples

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preparation example Construction

[0035] The present invention does not specifically limit the preparation method of the electrolyte, which is a well-known preparation method in the art, and can be prepared by mixing.

[0036] Such as figure 1 As shown, the second aspect of the present invention provides a kind of preparation method of magnesium alloy composite oxide black ceramic film as above, comprising:

[0037] The magnesium alloy is oxidized and electrolyzed using the electrolytic solution as described above to obtain the ceramic film.

[0038] In one embodiment, in the oxidation electrolysis of the present invention, the energization frequency is 100-1000 Hz, and the duty cycle is 5%-50%.

[0039] In one embodiment, in the oxidation electrolysis described in the present invention, the magnesium alloy is used as the anode, and the stainless steel is used as the cathode.

[0040] In one embodiment, the oxidation electrolysis time of the present invention is 1-30 min, preferably 1-10 min.

[0041] The p...

Embodiment 1

[0052] This example provides a kind of electrolytic solution, the preparation raw material of described electrolytic solution comprises: 20g / L potassium phosphate, 5g / L potassium hydroxide, 5g / L sodium metavanadate, 1g / L potassium permanganate, 2g / L Potassium ferrate, 50g / L triethanolamine, and water.

[0053] This example also provides the preparation method of electrolyte as above, including:

[0054] Add 20g / L potassium phosphate, 5g / L potassium hydroxide, and 5g / L sodium metavanadate into deionized water step by step, stir to dissolve, then add 1g / L potassium permanganate and 2g / L potassium ferrate , 50g / L triethanolamine obtains electrolytic solution.

[0055] This example also provides a method for preparing a magnesium alloy composite oxide black ceramic film, including:

[0056] After the magnesium alloy is pickled and washed in sequence, it is put into the above-mentioned electrolyte for oxidation electrolysis, washed with water and dried to obtain the ceramic film;...

Embodiment 2

[0058] This example provides an electrolyte solution, the preparation raw materials of the electrolyte solution include: 15g / L sodium phosphate, 2g / L potassium hydroxide, 10g / L sodium metavanadate, 1g / L potassium permanganate, 5g / L high iron sodium bicarbonate, 50g / L triethanolamine and water.

[0059] This example also provides the preparation method of electrolyte as above, including:

[0060] Add 15g / L sodium phosphate, 2g / L potassium hydroxide, and 10g / L sodium metavanadate into deionized water step by step, stir to dissolve, then add 1g / L potassium permanganate and 5g / L sodium ferrate , 50g / L triethanolamine obtains electrolytic solution.

[0061] This example also provides a method for preparing a magnesium alloy composite oxide black ceramic film, including:

[0062] After the magnesium alloy is pickled and washed in sequence, it is put into the above-mentioned electrolyte for oxidation electrolysis, washed with water and dried to obtain the ceramic film; in the oxida...

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Abstract

The invention relates to the technical field of metal surface treatment, in particular to an electrolyte and a preparation method of a magnesium alloy composite oxide black ceramic membrane. The electrolyte is prepared from the following raw materials of 15-30g / L of phosphate, 1-10g / L of hydroxide salt, 5-15g / L of metavanadate, 1-5g / L of iron-containing salt, 10-150g / L of organic amine and water. By selecting the types of main salt and coloring salt, selecting the salt containing vanadium, iron and the like as the coloring salt and controlling the use amount, the black ceramic membrane can be obtained, and the problem that the ceramic membrane is slightly brownish yellow due to use of the vanadium-containing salt is avoided. Proper preparation raw materials of the electrolyte are selected, the black ceramic membrane can be formed in a short time, and the power consumption is reduced. When the electrolyte is used for treating a magnesium alloy, the thin black membrane with a uniform surface can be formed in a short time.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, and more specifically, the invention relates to a preparation method of an electrolyte solution and a magnesium alloy composite oxide black ceramic film. Background technique [0002] Magnesium alloy is a light and practical metal with a density of 1.8g / cm3, which is about 2 / 3 of the density of aluminum alloy. Magnesium alloy has the characteristics of light weight, good heat dissipation, shock absorption and noise reduction, and impact resistance. It has more and more applications in aerospace, rail transit, automobile and electronic products and other fields. However, the poor corrosion resistance of magnesium alloys is one of the constraints affecting their large-scale application. Magnesium alloy workpieces need more effective surface treatment measures, such as passivation, painting, etc., to protect the surface from corrosion. Magnesium alloy composite oxidation technology...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30
Inventor 叶鹏飞万宗跃李俊锋刘锐王莉
Owner 斯特凯新材料(上海)有限公司
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