A solution for realizing in-situ sealing of micro-arc oxidation film on the surface of magnesium alloy and method for preparing micro-arc oxidation film

A micro-arc oxidation and in-situ sealing technology, which is applied in anodic oxidation and other directions, can solve the problems of complex sealing treatment and affecting corrosion resistance, and achieve the effects of saving sealing treatment steps, long service life and stable solution

Active Publication Date: 2017-05-10
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the problem that a large number of micropores in the traditional magnesium alloy micro-arc oxidation film affect the corrosion resistance and require complex processes for hole sealing treatment, the purpose of the present invention is to provide a method that can realize in-situ sealing of the micro-arc oxidation film on the surface of magnesium alloy Solution and method for preparing high corrosion-resistant micro-arc oxidation film using the solution

Method used

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  • A solution for realizing in-situ sealing of micro-arc oxidation film on the surface of magnesium alloy and method for preparing micro-arc oxidation film
  • A solution for realizing in-situ sealing of micro-arc oxidation film on the surface of magnesium alloy and method for preparing micro-arc oxidation film
  • A solution for realizing in-situ sealing of micro-arc oxidation film on the surface of magnesium alloy and method for preparing micro-arc oxidation film

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Experimental program
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Effect test

Embodiment 1

[0030] The preparation process of a solution that can realize the in-situ sealing of micro-arc oxidation film on the surface of magnesium alloy is as follows: sodium fluorotitanate, potassium polyphosphate and potassium polymetaphosphate are respectively dissolved in appropriate amount of distilled water and mixed together to form a solution, and The concentration of each component in the solution is: 8g / L sodium fluotitanate, 3g / L potassium polyphosphate, 4g / L potassium polymetaphosphate. Then add sodium hydroxide to the above solution according to the addition amount of 5g / L (5g sodium hydroxide is added to each liter of solution), and after the white colloidal suspended particles are no longer precipitated, add polybutyl acetate additive, polybutyl acetate The additive amount is 0.05g / L. Sodium hydroxide was then added to adjust the pH to 5, and the resulting mixed slurry was allowed to stand for 1 day.

[0031] The sample is AM30 magnesium alloy. After sanding to remove ...

Embodiment 2

[0036] The preparation process of a solution that can realize in-situ sealing of micro-arc oxidation film on the surface of magnesium alloy is as follows: potassium fluorotitanate, sodium polyphosphate and ammonium polymetaphosphate are respectively dissolved with appropriate amount of distilled water and mixed together to form a solution. And the concentration of each component in the solution is: 5g / L potassium fluotitanate, 8g / L sodium polyphosphate, 1g / L ammonium polymetaphosphate. Then add ammonia water in the above-mentioned solution according to the addition amount of 2g / L, after the white colloidal suspension particle no longer precipitates, add polyurethane additive, the addition amount of polyurethane additive is 1g / L. Then add sodium hydroxide, adjust the pH to 8, and let stand for 1 day.

[0037] The sample is AZ91 cast magnesium alloy. After sanding to remove surface oxides and burrs, wipe with acetone to degrease.

[0038] The pretreated magnesium alloy workpie...

Embodiment 3

[0042] The preparation process of a solution capable of realizing the in-situ sealing of micro-arc oxidation film on the surface of magnesium alloy is as follows: dissolving ammonium fluorotitanate, sodium polyphosphate and sodium polymetaphosphate respectively with an appropriate amount of distilled water and mixing them together to form a solution, and The concentration of each component in the solution is: 11g / L ammonium fluorotitanate, 6g / L sodium polyphosphate, 2g / L sodium polymetaphosphate. Then potassium hydroxide was added to the above solution in an amount of 3g / L, and after white colloidal suspended particles were no longer precipitated, sodium polyacrylate additive was added, and the amount of sodium polyacrylate additive was 0.8g / L. Adjust the pH to 6.5 and let stand for 1 day.

[0043] The sample is AZ31 magnesium alloy. After sanding to remove surface oxides and burrs, wipe with acetone to degrease.

[0044] The pretreated magnesium alloy workpiece is clamped b...

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Abstract

The invention discloses a solution for achieving in-situ hole sealing on a micro-arc oxidation coating on a magnesium alloy surface and a preparation method of the micro-arc oxidation coating, and belongs to the field of magnesium alloy surface processing technology. The preparation method of the solution comprises the following steps: dissolving fluotitanate, polyphosphate, and polymetaphosphate in distilled water, adding hydroxides to generate a large amount of white colloidal suspension particles, adding an organic additive, adjusting the pH value to 5-10, and allowing the system to stand still for a whole day so as to obtain the solution. A magnesium alloy work tool is soaked in the solution to carry out micro-arc oxidation so as to obtain the micro-arc oxidation coating. The electrolyte will carry out hydrolysis reactions to generate TiO2 sol particles, the TiO2 sol particles will participate in the micro-arc oxidation film-forming process, and thus the formed micro-arc oxidation coating is mainly composed of titanium-containing oxides having a good chemical stability; because the freezing points of the substances in the coating are different, the micro pores in the coating are sealed automatically during the film-forming process, and thus the post treatment of pore sealing is saved.

Description

technical field [0001] The invention relates to a magnesium alloy surface treatment technology, in particular to a solution for realizing in-situ sealing of a micro-arc oxidation film on the surface of a magnesium alloy and a method for preparing the micro-arc oxidation film. Background technique [0002] Magnesium and its alloys have many excellent properties, such as high specific strength and specific stiffness, good shock absorption and electromagnetic shielding performance, easy cutting and recycling, and abundant storage capacity, which makes magnesium alloys widely used as the lightest industrial materials Electronics, aerospace and automotive fields. However, magnesium is a very active metal, and poor corrosion resistance is an unavoidable problem in the practical application of magnesium alloys. Protective coating is the most effective measure to improve the corrosion resistance of magnesium alloys. Common protection methods for magnesium alloys in practice includ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/30
Inventor 宋影伟单大勇韩恩厚
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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