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An effective method to control the corrosion rate of magnesium alloy

A corrosion rate, magnesium alloy technology, applied in the field of magnesium alloys, can solve the problems of uncontrollable, too fast corrosion rate of magnesium alloys, etc., and achieve the effect of simple equipment, low cost, and simple processing operation

Active Publication Date: 2018-07-10
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an effective method for regulating and controlling the corrosion rate of magnesium alloys, so as to solve the problems that the corrosion rate of magnesium alloys is too fast and uncontrollable in the used field

Method used

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  • An effective method to control the corrosion rate of magnesium alloy
  • An effective method to control the corrosion rate of magnesium alloy
  • An effective method to control the corrosion rate of magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Ⅰ), alloy selection

[0022] Use commercial AZ31 wrought magnesium alloy bar, its chemical composition (mass percentage composition) is: 3% Al, 1% Zn, the rest is Mg;

[0023] Ⅱ), deformation processing

[0024] The alloy was hot-extruded at 400°C for 4 hours, and the extrusion ratio was 5:1.

[0025] Ⅲ), stress relief annealing

[0026] The extruded alloy was kept at 400°C for 1 hour, and stress relief annealing was performed to eliminate the influence of residual stress on the corrosion anisotropy of the alloy.

[0027] Ⅴ) Microstructure characterization

[0028] The preparation process of the sample for microstructure observation is as follows: use No. 1000 silicon carbide water-grinding paper to grind the surface; then use oil-based diamond abrasive paste to mechanically polish; EBSD analysis results show that the texture of the alloy is a typical basal texture, and the corresponding graph and ( 0002), (11-20) and (10-10) pole figures are shown in Figure 1, whic...

Embodiment 2

[0032] Same as Example 1 in that:

[0033] Ⅰ), alloy selection

[0034] Ⅱ), deformation processing

[0035] Ⅲ), stress relief annealing

[0036] Ⅴ) Microstructure characterization

[0037] The difference from Example 1 is:

[0038] Ⅳ), Sampling location and corrosion performance test

[0039] A sample with a size of 5 mm (length) × 5 mm (width) × 3 mm (thickness) was cut by wire cutting, and the surface of the sample was at an angle of 45 degrees to the axis of the extruded rod. The specific orientation diagram is shown in Figure 1. The resin was used for cold mounting, and the surface was polished; then, the sample was placed in a NaCl solution with a molar concentration of 0.1M at room temperature for immersion and electrochemical experiments. The hydrogen collection experiment was carried out under the open circuit potential, and the specific hydrogen evolution curve is shown in the appendix figure 2 . It can be seen that the hydrogen evolution rate of the oriented ...

Embodiment 3

[0041] Same as Example 1 in that:

[0042] Ⅰ), alloy selection

[0043] Ⅱ), deformation processing

[0044] Ⅲ), stress relief annealing

[0045] Ⅴ) Microstructure characterization

[0046] The difference from Example 1 is:

[0047] Ⅳ), Sampling location and corrosion performance test

[0048]Use wire cutting to cut a sample with a size of 5mm (length) × 5mm (width) × 3mm (thickness). The surface of the sample is in the center layer of the extruded bar and parallel to the axis of the extruded bar. The specific orientation diagram is shown in the attached drawing 1. The resin was used for cold mounting, and the surface was polished; then, the sample was placed in a NaCl solution with a molar concentration of 0.1M at room temperature for immersion and electrochemical experiments. The hydrogen collection experiment was carried out under the open circuit potential, and the specific hydrogen evolution curve is shown in the appendix figure 2 . It can be seen that the hydroge...

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Abstract

The invention relates to the field of magnesium alloys and in particular to an effective method of regulating the corrosion rate of a magnesium alloy. The effective method is suitable for effectively regulating the corrosion rates of various deformed magnesium alloys and processing and preparing and meets the demand of biodegradation rate of a magnesium alloy implant material in different human body parts. The method comprises the following steps: in a condition of 300-400 DEG C, performing annealing treatment on a deformed magnesium alloy of a strong basic face structure for 0.5-2 hours to eliminate the residual stress caused by large deformation; and then cutting and sampling the alloy with different orientations and strictly controlling components and proportions of crystallographic surfaces contained on the surface of the sample. The effective method provided by the invention can obviously regulate the corrosion resistance of the magnesium alloy, solves the problem of regulating the corrosion rate of the magnesium alloy and achieves the demand of the magnesium alloy on different biodegradation rates in the medical field, so that the competitiveness of the magnesium alloy as a human body implant biological material is obviously enhanced.

Description

technical field [0001] The invention relates to the field of magnesium alloys, specifically an effective method for regulating the corrosion rate of magnesium alloys, which is applicable to the effective regulation and processing of the corrosion rates of various deformed magnesium alloys, and meets the needs of magnesium alloy implant materials in different human body parts in the medical field. Biodegradation rate requirements. Background technique [0002] Because magnesium and magnesium alloys have good biocompatibility and degradability, and have the same elastic modulus as human bone, they can be used as ideal candidate materials for bio-implantation in the medical field. In addition, the element magnesium is an essential element required in the biological metabolism process of the human body. Usually, the daily magnesium intake of normal adults is 300-400mg. Among them, the excess Mg 2+ It can be absorbed by the body or excreted through the urine. It can be seen t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/06
Inventor 许道奎韩恩厚
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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