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A Method of Improving the Strength and Corrosion Resistance of Cast ZK21 Magnesium Alloy

A casting magnesium alloy, ZK21 technology, applied in the field of casting ZK21 magnesium alloy process treatment, can solve the problems of poor corrosion resistance degradation speed, corrosion performance deterioration, poor corrosion resistance and other problems

Active Publication Date: 2020-10-13
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the application of magnesium alloys in bioimplantation is still limited by its performance.
On the one hand, due to the low standard potential of magnesium, its corrosion resistance is poor, and the products formed after corrosion are loose and porous, which cannot effectively prevent the development of corrosion, which leads to the deterioration of its corrosion performance.
Poor corrosion resistance will lead to too fast degradation of magnesium alloy materials after implantation in the human body, premature failure, affecting tissue growth and healing
On the other hand, the mechanical properties (mainly strength) of cast magnesium alloys are not excellent enough due to coarse grains and many structural defects.
This also limits its scope of application as a bioimplantation material

Method used

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  • A Method of Improving the Strength and Corrosion Resistance of Cast ZK21 Magnesium Alloy
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  • A Method of Improving the Strength and Corrosion Resistance of Cast ZK21 Magnesium Alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The components and mass percentages of the ZK21 cast magnesium alloy used are: Zn: 1.87%, Zr: 0.54%, and the rest are Mg and unavoidable impurities. The magnesium alloy above was subjected to solid solution treatment at a temperature of 360°C and a holding time of 12 hours. In order to prevent oxidation, pyrite powder (FeS 2 ) as protection; water cooled to room temperature. Then, the solution-treated magnesium alloy is extruded into rods through extrusion at an extrusion temperature of 350° C. and an extrusion speed of 3 mm / s.

[0022] The properties of the alloy obtained in this embodiment are as follows: the yield strength is 173 MPa, and the average corrosion rate after soaking in Hank's solution for 240 hours is 0.55 mm / year.

Embodiment 2

[0024] The components and mass percentages of the ZK21 cast magnesium alloy used are: Zn: 1.87%, Zr: 0.54%, and the rest are Mg and unavoidable impurities. The magnesium alloy above was subjected to solid solution treatment at a temperature of 400°C and a holding time of 12 hours. In order to prevent oxidation, pyrite powder (FeS 2 ) as protection; water cooled to room temperature. Then, the solution-treated magnesium alloy is extruded into rods through extrusion at an extrusion temperature of 350° C. and an extrusion speed of 3 mm / s.

[0025] The properties of the alloy obtained in this embodiment are as follows: the yield strength is 191MPa, and the average corrosion rate after soaking in Hank's solution for 240 hours is 0.48mm / year.

Embodiment 3

[0027] The components and mass percentages of the ZK21 cast magnesium alloy used are: Zn: 1.87%, Zr: 0.54%, and the rest are Mg and unavoidable impurities. The magnesium alloy above was subjected to solid solution treatment at a temperature of 400°C and a holding time of 24 hours. In order to prevent oxidation, pyrite powder (FeS 2 ) as protection; water cooled to room temperature. Then, the solution-treated magnesium alloy is extruded into rods through extrusion at an extrusion temperature of 350° C. and an extrusion speed of 3 mm / s.

[0028] The properties of the alloy obtained in this embodiment are as follows: the yield strength is 194MPa; the average corrosion rate after soaking in Hank's solution for 240 hours is 0.32mm / year.

[0029] Comparative analysis of the three examples shows that Example 3 has the best overall performance, and has both excellent strength and corrosion resistance. Its properties are as follows: the yield strength is 194MPa, and the average corro...

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Abstract

The invention provides a method for improving the strength and corrosion resistance of cast ZK21 magnesium alloy. The alloy comprises, by mass, 1.87% of Zn, 0.54% of Zr and the balance Mg and inevitable impurities. The method comprises the steps of performing solution treatment to cast magnesium alloy in an electric box furnace firstly, wherein the solution temperature is 360-400 DEG C, and the solution treatment time is 12-24 hours; adding pyrite powder (FeS2) for protection according to the volume ratio of 1:100 in order to prevent oxidization; and then, performing extrusion treatment to themagnesium alloy after solution treatment at the extrusion temperature of 350 DEG C and the extrusion speed of 3 mm / s to obtain bars. The method has the advantages that the ZK21 alloy after solution treatment contains few second phases, thereby benefiting reduction of galvanic corrosion; the grain refinement after extrusion is obvious, and the structure compactness is improved; the porosity is reduced, and the strength and corrosion resistance of the magnesium alloy are improved greatly. The alloy has high strength and corrosion resistance, and can be applied to the medical field of degradableabsorbable bone nails, bone plates and the like.

Description

technical field [0001] The invention relates to a metal processing method, in particular to a processing method for casting ZK21 magnesium alloy. Background technique [0002] In recent years, magnesium alloy materials have shown broad application prospects in the field of biomedicine and have been widely studied. As a bio-implant material with great potential, magnesium alloy has obvious advantages. First of all, magnesium is an essential trace element in the human body, which plays an important role in maintaining human health and promoting metabolism; secondly, magnesium alloy materials can be automatically degraded after being implanted in the human body, reducing the need for secondary removal of materials such as stainless steel The surgical risk brought about also reduces the pain of the patient, and most of the degraded magnesium alloy can be discharged from the human body without causing harm to human health; in addition, the elastic mold of the commonly used metal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/06
CPCB21C23/001C22C23/04C22F1/02C22F1/06
Inventor 宋仁伯汪孪祥蔡长宏
Owner UNIV OF SCI & TECH BEIJING
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