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A surface modification method for delaying the degradation rate of biomedical magnesium alloys

A technology of surface modification and degradation rate, applied in metal material coating process, ion implantation plating, coating, etc., to achieve the effect of broadening application range, prolonging service life and excellent corrosion resistance

Inactive Publication Date: 2015-08-26
江苏凯晞投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, domestic and foreign studies on the co-injection of magnesium alloys are mostly limited to the co-injection of metal-gas elements, such as Ti / N (Liu Hongxi, Meng Chunlei, Lin Bo, etc. Nitrogen and titanium double ion implantation of AZ31 magnesium alloy Corrosion resistance and mechanical properties [J]. Journal of Materials Heat Treatment, 2011,32(8):137-141), Ti / O (Y Zhao, G.S Wu, Q.Y Lu, et al. Improved surface corrosion resistance of WE43 magnesium alloy by dual titanium and oxygen ion implantation[J].Thin Solid Films,2013,529:407-411), etc., but the research on the co-injection process of metal-metal elements of magnesium alloys, especially rare earth metals-rare earth metal elements has not been reported yet

Method used

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  • A surface modification method for delaying the degradation rate of biomedical magnesium alloys

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] AZ31 magnesium alloy is used as the base material, and its composition is: Al3%, Zn1%, and the rest is Mg. The surface modification method to delay the degradation rate of biomedical magnesium alloys is as follows: firstly, the surface of AZ31 magnesium alloy is polished with 280, 400, 800 and 1000 mesh metallographic sandpaper to remove surface pollutants, and polished to a mirror surface; then ultrasonically cleaned with ethanol , dry with cold air; -3 Below Pa, implant gadolinium ions into the surface first and then implant neodymium ions. The implantation temperature is room temperature, the extraction voltage is 60kV, and the implantation dose is 2.5×10 gadolinium ions. 16 ions / cm 2 , Neodymium ions 5 x 10 16 ions / cm 2 ; After injection, inflate, take out the sample, clean and dry. The polarization curve test of the sample in simulated body fluid (SBF) shows that (such as figure 1 shown), after co-injection of AZ31 magnesium alloy gadolinium and neodymium ions...

Embodiment 2

[0023] AZ91 magnesium alloy is used as the base material, and its composition is: Al9%, Zn1%, and the rest is Mg. The co-implantation process of gadolinium and neodymium ions is the same as that in Example 1, except that the implantation dose is 2.5×10 16 ions / cm 2 Gd+1×10 17 ions / cm 2 Nd. The corrosion voltage of the sample measured in the mold SBF is -1.44V, which is 0.1V higher than the substrate, and the corrosion current is about 1.52×10 -5 A / cm 2 , which is nearly an order of magnitude lower than the matrix, indicating a total injection of 2.5×10 16 ions / cm 2 Gd+1×10 17 ions / cm 2 After adding gadolinium and neodymium ions to Nd, the degradation behavior of AZ91 magnesium alloy was greatly relieved.

Embodiment 3

[0025] The Mg-Zn magnesium alloy is used as the base material, and its composition is: Zn5.6%, and the rest is Mg. The process of co-implantation of gadolinium and neodymium ions is the same as in Example 1, except that the implantation dose is 5×10 gadolinium ions 16 ions / cm 2 , Neodymium ions 1.5 x 10 17 ions / cm 2 . The corrosion voltage of the co-injected Mg-Zn magnesium alloy in SBF basically does not change, and the corrosion current density drops to 5.13×10 -5 A / cm 2 , reduced by about 7 times, indicating that the Mg-Zn magnesium alloy is 5×10 16 ions / cm 2 Gd+1.5×10 17 ions / cm 2 After the co-implantation of gadolinium and neodymium ions of Nd, its degradation rate is reduced.

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Abstract

The invention discloses a surface modification method for delaying the degradation rate of a biomedical magnesium alloy. The method comprises the following steps of pre-processing the magnesium alloy, injecting ions and post-processing, wherein pre-processing the magnesium alloy comprises grinding, polishing, cleaning and drying sequentially; in the step of injecting the ions, the processed magnesium alloy is put into a cavity of an ion injection machine and vacuumized, the injection dose is set and an extraction power supply is turned on after an ion source pre-heats for 10 minutes, the extraction voltage is regulated, and the ions are injected into the surface, wherein the injection mode is that the gadolinium ions are injected and then the neodymium ions are injected, the injection dose of the gadolinium ions is 2.5*10<16>-1*10<17> ions / cm<2>, and the injection dose of the neodymium ions is 5*10<16>-1.5*10<17> ions / cm<2>; and in the step of post-processing, the magnesium alloy with the ions injected is cleaned, dried and saved. The surface modification method for delaying the degradation rate of the biomedical magnesium alloy, provided by the invention, is simple in process, has no pollution to the environment, can delay the degradation rate of the biomedical magnesium alloy in a human body, prolongs the service life of a magnesium alloy medical implantation device, causes no harm to the human body and has a relatively good biocompatibility, and the application scope of the magnesium alloy is expanded.

Description

technical field [0001] The invention relates to a surface modification method for delaying the degradation rate of a biomedical magnesium alloy, belonging to the technical field of metal surface modification. Background technique [0002] Due to the excellent biocompatibility of magnesium alloys and the comprehensive mechanical properties such as elastic modulus close to that of human bones, magnesium alloys have attracted more and more attention in the fields of biomedicine and other fields. However, magnesium alloys have high chemical activity and are easily degraded rapidly in physiological environment, which seriously hinders their development and application in the field of biomedicine. Therefore, effective control of the degradation rate of magnesium alloys plays an important role in expanding the medical applications of magnesium alloys. [0003] Common magnesium alloy surface modification technologies mainly include alloying, chemical transformation, vapor depositio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/48C23C14/16
Inventor 王章忠陶学伟王强巴志新章晓波
Owner 江苏凯晞投资有限公司