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Magnesium alloy gradient composite coating and application thereof

A composite coating and magnesium alloy technology, which is applied in metal material coating technology, coating, medical science, etc., can solve problems such as uneven dispersion, delamination, and coating peeling

Inactive Publication Date: 2021-09-14
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the above-mentioned prior art, the problem to be solved by the present invention is: how to provide a magnesium alloy gradient composite coating to solve the problem that the bonding strength between the composite coating and the magnesium alloy is low, and the coating is likely to be cracked during the degradation process. , delamination, resulting in large-scale peeling off of the coating, and easy to disperse unevenly, resulting in uneven degradation of the coating, premature failure of the coating, implantation failure and other technical problems

Method used

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  • Magnesium alloy gradient composite coating and application thereof
  • Magnesium alloy gradient composite coating and application thereof
  • Magnesium alloy gradient composite coating and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0049] A kind of polycaprolactone / hydroxyapatite gradient composite coating, its preparation method, comprises the steps:

[0050] 1.1. Pretreatment: Cut the magnesium alloy into a sample of φ10mm×1mm. There is a small hole with a diameter of 1mm on the edge of the sample, which can be tied with a thin wire for hanging in the experiment. Use SiC sandpaper (the roughness of the sandpaper is 200#, 400#, 600#, 800#, 1000#, 1200#) to polish the sample until the surface is smooth and no scratches can be seen with the naked eye. Clean it in an ultrasonic cleaner, rinse the surface with deionized water, dry it with a hair dryer, and put it into the sample tape for later use.

[0051] 1.2. Preparation of micro / nano-structured hydroxyapatite film layer by hydrothermal method: weigh EDTA calcium salt and NaH with an electronic balance 2 PO 4 Solution (volume ratio 1.67:1, concentration 0.25M), weigh it and put it into a glass beaker, measure the required deionized water with a measuri...

Embodiment 2

[0063] HA, PCL / HA gradient composite coating samples were tested for performance.

[0064] The experimental samples include: (1) magnesium alloy AZ31; (2) AZ31 sample treated with hydroxyapatite coating; (3) AZ31 sample treated with polycaprolactone / hydroxyapatite coating.

[0065] Performance testing method:

[0066] 2.1 Evaluate coating adhesion according to "GB / T 9286-1998" scratch-tear test.

[0067] Put the cross-cutting knife perpendicular to the coating surface and at a steady speed, cut out parallel lines with a spacing of 1mm on the coating surface, and all the cuts penetrate to the magnesium alloy substrate; , cut the second set of equal parallel lines with a spacing of 1 mm; flatten the permacel P99 tape (American Primason Berger test tape) on the cut grid, and hold the two ends of the tape at 90° perpendicular to the sample Tear off the tape at the same time in the same direction; make statistics on the shedding of the coating on the surface of the sample and aro...

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Abstract

The invention discloses a magnesium alloy gradient composite coating and application thereof. A hydroxyapatite crystal layer with micro-nano gaps grows on the surface of magnesium alloy through a hydrothermal method, then KH550 is used for modification treatment, dichloromethane is used as a solvent for preparing a 30-70g / L PCL solution, and the hydroxyapatite crystal layer with the micro-nano gaps of the magnesium alloy is put into the PCL solution for lifting; and drying is carried out, and the magnesium alloy gradient composite coating is prepared. The technical problems that the bonding strength of an existing composite coating and the magnesium alloy is low, the coating is prone to cracking, layering and peeling, uneven dispersion is prone to happening, and consequently the coating is unevenly degraded are solved; and the bonding performance reaches the first level in GB / T 9286-1998, the self-corrosion current density is reduced by 8 times compared with a single hydroxyapatite coating, the electrochemical corrosion speed is reduced by 8 times, the coating breaking potential is increased by 0.28V, a gradient layer is formed, and the functions that after the coating is implanted into a living body, the initial drug concentration is high, and the drug concentration is gradually reduced along with time are achieved through cooperation of the gradient layer and the drug loading performance of the composite layer.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy surface modification, and in particular relates to a magnesium alloy gradient composite coating and its application. Background technique [0002] Magnesium and magnesium alloys have attracted extensive attention due to their mechanical properties, biodegradability and biocompatibility close to those of human natural bone. However, under physiological environment, the rapid corrosion degradation of magnesium and magnesium alloys has become a key problem limiting its clinical application. Hydroxyapatite (HA) has good biocompatibility and biodegradability, and is the main inorganic component of human bone. The construction of hydroxyapatite coating on the surface of magnesium alloy can not only improve the biocompatibility of the material, but also delay the corrosion rate of the magnesium alloy substrate to a certain extent. In recent years, people have used methods such as electrodeposit...

Claims

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Application Information

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IPC IPC(8): A61L27/32A61L27/34A61L27/04A61L27/50A61L27/54A61L27/58C23C26/00
CPCA61L27/32A61L27/34A61L27/047A61L27/50A61L27/54A61L27/58C23C26/00A61L2400/18A61L2420/02A61L2420/04A61L2300/602A61L2300/606C08L67/04
Inventor 张春艳王红伟成兰
Owner CHONGQING UNIV OF TECH
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