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Surface coating capable of degrading magnesium and magnesium alloy and preparation method of surface coating

A surface coating and magnesium alloy technology, applied in the direction of metal material coating process, etc., can solve the problems of lack of coating thickness, coverage and interface bonding strength, long time, and inability to form, and it is difficult to control and produce uniformity. The process is simple and the effect of improving the bonding force

Pending Publication Date: 2022-06-14
SUZHOU INNOTECH MEDICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem is that there are a large number of micropores and cracks on the surface of the micro-arc electrophoretic coating, which provide ion channels for the infiltration of corrosive media, and directly affect the protective performance of the coating layer against corrosion degradation of the magnesium substrate.
But there are problems and deficiencies: 1) the calcium source used in this method is calcium nitrate, and there is no complexing agent in the system, so it is difficult to adjust the pH value of the solution; The mechanical properties of the matrix; 3) Since hydroxyapatite is not easy to deposit directly on the surface of magnesium and magnesium alloys, the thickness, coverage and interfacial bonding strength of the coating will be obviously lacking; 4) The surface of the coating cannot form a higher biological activity. Composite Morphology of Micro-Nano Scale Hierarchical Structures
The existing problems and deficiencies are: 1) the fluoride ions produced by the degradation of the magnesium fluoride layer may have a negative impact on the local bone tissue, causing problems such as fluorosis; 2) the preparation process is cumbersome and takes a long time, and brushite needs to be prepared first Then converted into hydroxyapatite; 3) The production process requires the use of toxic reagents such as high-concentration hydrogen fluoride, which is more dangerous

Method used

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  • Surface coating capable of degrading magnesium and magnesium alloy and preparation method of surface coating
  • Surface coating capable of degrading magnesium and magnesium alloy and preparation method of surface coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Prepare a controllable degradable coating on the surface of AZ31 magnesium alloy rods, the specific steps are as follows:

[0031] 1) First, AZ31 magnesium alloy is made into a Φ3×10mm sample, polished with 800#, 1200#, 2000# sandpaper in turn, ultrasonically cleaned in anhydrous acetone for 5 minutes to remove the surface oil, and dried after cleaning;

[0032] 2) Prepare a solution containing 0.25mol / L magnesium nitrate and 0.25mol / L sodium dihydrogen phosphate, adjust the pH of the solution to 3.5 with dilute nitric acid, and heat it in a water bath to 75°C;

[0033] 3) Put the AZ31 magnesium alloy sample into the heated solution, soak and react for 60 minutes, then take it out and rinse it with deionized water, and dry it to obtain the AZ31 magnesium alloy sample with a magnesium phosphate conversion layer;

[0034] 4) Prepare a solution containing 0.25mol / L calcium citrate and 0.25mol / L sodium dihydrogen phosphate, and use sodium hydroxide to adjust the pH to 9.5; ...

Embodiment 2

[0038] Prepare a controllable degradable coating on the surface of AZ31 magnesium alloy rods, the specific steps are as follows:

[0039]1) First, AZ31 magnesium alloy is made into a Φ3×10mm sample, polished with 800#, 1200#, 2000# sandpaper in turn, ultrasonically cleaned in anhydrous acetone for 5 minutes to remove the surface oil, and dried after cleaning;

[0040] 2) Prepare a solution containing 0.5 mol / L magnesium sulfate and 0.5 mol / L potassium dihydrogen phosphate, adjust the pH of the solution to 2.5 with dilute sulfuric acid, and heat it in a water bath to 60°C;

[0041] 3) Put the AZ31 magnesium alloy sample into the heated solution, soak and react for 120 minutes, then take it out and rinse it with deionized water, and dry it to obtain the AZ31 magnesium alloy sample with a magnesium phosphate conversion layer;

[0042] 4) Prepare a solution containing 0.15mol / L calcium EDTA-Ca and 0.15mol / L potassium dihydrogen phosphate, and adjust the pH to 9.0 with potassium hy...

Embodiment 3

[0046] Prepare a controllable degradable coating on the surface of ZK60 magnesium alloy rods, the specific steps are as follows:

[0047] 1) First, make a Φ3×10mm sample of ZK60 magnesium alloy, polish it with 800#, 1200#, 2000# sandpaper in turn, and ultrasonically clean it in anhydrous acetone for 5 minutes to remove the surface oil, and then dry it after cleaning;

[0048] 2) Prepare a solution containing 0.25 mol / L magnesium dihydrogen phosphate, adjust the pH of the solution to 3.0 with phosphoric acid, and heat to 70°C in a water bath;

[0049] 3) Put the ZK60 magnesium alloy sample into the heated solution, soak and react for 45 minutes, then take it out and rinse it with deionized water, and dry it to obtain a K60 magnesium alloy sample with a magnesium phosphate conversion layer;

[0050] 4) Prepare a solution containing 0.10 mol / L calcium citrate and 0.10 mol / L sodium dihydrogen phosphate, and use sodium hydroxide to adjust the pH to 9.0;

[0051] 5) Put the K60 mag...

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Abstract

The invention discloses a surface coating capable of degrading magnesium and magnesium alloy and a preparation method thereof, the surface coating comprises an inner layer and an outer layer, the inner layer is a magnesium phosphate salt conversion layer, and the outer layer is a hydroxyapatite coating. The prepared coating is of a double-layer structure, the magnesium phosphate salt conversion layer on the inner layer provides growth sites for the hydroxyapatite coating on the outer layer, the binding force of the coating and a base material is effectively improved, and the binding strength can reach 50 MPa or above; in addition, the thickness of the hydroxyapatite coating is controllable, the degradation time can be adjusted according to needs, and the degradation time of the magnesium alloy implant can be controlled to be 12-18 months.

Description

technical field [0001] The invention relates to the technical field of surface coatings of magnesium and magnesium alloys, in particular to a surface coating of degradable magnesium and magnesium alloys and a preparation method thereof. Background technique [0002] At present, the common bone implant materials used in clinical practice are mostly non-degradable stainless steel, titanium alloy, and cobalt-based alloy materials, which remain in the body for a long time after implantation and will stimulate the surrounding body tissues to varying degrees. After recovery, the patient usually needs to undergo a second operation to remove the metal implant, which in turn brings more pain and financial burden to the patient. In addition, the elastic modulus of these materials is much higher than that of bone tissue, which will lead to the effect of "stress shielding" and affect the repair of bone tissue. Compared with the above traditional implant materials for bone repair, magnes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/08C23C22/82
CPCC23C22/08C23C22/82C23C22/22C23C22/73C23C22/68
Inventor 时晨孙毅
Owner SUZHOU INNOTECH MEDICAL TECH CO LTD
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