Hole sealing method for micro-arc oxidation film layer
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A micro-arc oxidation and film layer technology, applied in anodizing, coating, surface reaction electrolytic coating, etc., can solve the problems of unfavorable magnesium alloy matrix isolation, gas accompanying material injection, etc., and achieve good effect and hydrophilicity, Improve corrosion resistance and slow down corrosion
Active Publication Date: 2020-12-11
GUANGDONG MECHANICAL & ELECTRICAL COLLEGE
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However, the general micro-arc oxidation process will be accompanied by severe high temperature, and there will be a situation where the generated gas is accompanied by material injection, which will eventually cause an inherent microporous structure on the surface of the micro-arc oxidation film (specifically, the porosity from the inside to the outside From small to large), it is not conducive to maintaining the isolation of the magnesium alloy matrix from the external corrosive environment for a long time
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Embodiment 1
[0039] A method for sealing pores of a micro-arc oxidation film layer, comprising the following steps:
[0040] 1) Put the magnesium / magnesium alloy with the micro-arc oxidation film layer into ultrapure water for 20 seconds, take it out, blow it dry with cold wind, put it into 75% alcohol and ultrasonically clean it for 8 minutes, and then take it out;
[0041] 2) mixing polycaprolactone (number average molecular weight 20000g / mol) and tetrahydrofuran according to a mass ratio of 1:3.5, stirring to fully dissolve polycaprolactone to obtain a polycaprolactone solution;
[0042] 3) immerse the magnesium / magnesium alloy with the micro-arc oxidation film layer treated in step 1) in the polycaprolactone solution, and ultrasonically treat it for 30s;
[0043] 4) Take out the magnesium / magnesium alloy with the micro-arc oxidation film layer treated in step 3), place it in an airtight container, evacuate until the pressure in the airtight container is 0.02MPa, and treat for 5 minutes...
Embodiment 2
[0048] A method for sealing pores of a micro-arc oxidation film layer, comprising the following steps:
[0049] 1) Put the magnesium / magnesium alloy with the micro-arc oxidation film layer into ultrapure water for 15 seconds, take it out, dry it with cold wind, put it into 75% alcohol for 10 minutes and take it out;
[0050] 2) mixing polycaprolactone (number average molecular weight 20000g / mol) and tetrahydrofuran according to a mass ratio of 1:9.5, stirring to fully dissolve the polycaprolactone to obtain a polycaprolactone solution;
[0051] 3) immerse the magnesium / magnesium alloy with the micro-arc oxidation film layer treated in step 1) in the polycaprolactone solution, and ultrasonically treat it for 15s;
[0052] 4) Take out the magnesium / magnesium alloy with the micro-arc oxidation film layer treated in step 3), place it in an airtight container, evacuate until the pressure in the airtight container is 0.04MPa, and treat for 8 minutes;
[0053] 5) Repeat steps 3) and...
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Abstract
The invention discloses a hole sealing method for a micro-arc oxidation film layer. The hole sealing method for the micro-arc oxidation film layer comprises the following steps of 1) cleaning and drying magnesium/magnesium alloy with the micro-arc oxidation film layer; 2) preparing a polycaprolactone solution; 3) dipping the magnesium/magnesium alloy with the micro-arc oxidation film layer in thepolycaprolactone solution; 4) performing vacuum drying on the dipped magnesium/magnesium alloy with the micro-arc oxidation film layer; 5) repeating the steps 3) and 4) for multiple times; and 6) putting the magnesium/magnesium alloy with the micro-arc oxidation film layer treated in the step 5) into a closed container, heating until the temperature in the closed container exceeds a melting pointof polycaprolactone, pressurizing and holding, cooling to the room temperature, and reducing the pressure. According to the hole sealing method for the micro-arc oxidation film layer provided by the invention, the micro-arc oxidation film layer is subjected to hole sealing through a dipping-dip coating-curing method, so that the macroscopic surface of the material can be smooth, and hole sealing is firm; and then micropores are sealed through heating, pressurizing, cooling and pressure reducing operation, so that the corrosion resistance of the magnesium/magnesium alloy is greatly improved onthe basis of the micro-arc oxidation film layer.
Description
technical field [0001] The invention relates to a hole sealing method for a micro-arc oxidation film layer, and belongs to the technical field of micro-arc oxidation film layer sealing. Background technique [0002] As a bone implant material, magnesium / magnesium alloy has many advantages such as biodegradability, good biocompatibility, high specific strength and specific stiffness, and has a good development prospect. Generally, it takes 4 to 8 weeks for bone tissue to heal due to disease conditions and individual differences, and magnesium / magnesium alloy implants need to provide sufficient mechanical support and good biocompatibility during this period. Therefore, in the early stage of implantation, the degradation rate of magnesium / magnesium alloys should be kept slow enough to ensure the stability of mechanical properties. In the later stages of bone tissue healing, magnesium / magnesium alloys should be degraded as soon as possible under the premise of meeting the biocom...
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Application Information
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