A kind of static pressure stress corrosion corrosion electrochemical behavior simulation experimental device and experimental method of magnesium alloy

A simulation experiment device, stress corrosion technology, applied in the field of electrochemistry, can solve the problems of insufficient plastic deformation ability, fast degradation, low strength, etc., to reduce the ohmic drop of the solution, the device structure is simple, and the effect of meeting the experimental needs is achieved.

Active Publication Date: 2019-06-18
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] (2) Poor growth of new bone around the implant material;
At present, the research in the field of biodegradable magnesium alloys for medical implants mainly focuses on the development of alloys with good corrosion resistance and excellent mechanical properties, especially plastic deformation ability, but it is difficult to satisfy these two points at the same time.
Magnesium alloy orthopedic implant materials currently in clinical use have the problems of low strength and rapid degradation; while magnesium alloys used as cardiovascular stents have insufficient plastic deformation ability and rapid degradation
In addition, most of the currently researched medical magnesium alloys contain Al element. Aluminum is not an essential trace element for the human body, and is considered to be neurotoxic and a factor leading to Alzheimer's disease. The tolerance limit of Al-containing magnesium alloys in the human body is only 1g / year
[0013] At present, there is no uniform standard for the determination of corrosion rate of magnesium alloys at home and abroad; there is a great deviation between the results of immersion experiments in simulated body fluids and in vivo experiments; in vivo experiments are faced with high experimental costs and long test cycles. difficult to quantify

Method used

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  • A kind of static pressure stress corrosion corrosion electrochemical behavior simulation experimental device and experimental method of magnesium alloy
  • A kind of static pressure stress corrosion corrosion electrochemical behavior simulation experimental device and experimental method of magnesium alloy
  • A kind of static pressure stress corrosion corrosion electrochemical behavior simulation experimental device and experimental method of magnesium alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] The applied static compressive stress is 0.0 MPa.

[0092] The test results are shown in Table 1 below.

[0093] like figure 2 as shown, figure 2 The three curves in the figure are the polarization curves of three parallel samples under the same experimental conditions.

[0094] Polarization curves 1, 2, 3 correspond to the self-corrosion current density I of the Mg-4Li-1Ca alloy sample corr and self-corrosion potential E corr

[0095]As shown in Table 1. The electrochemical parameters in Table 1, combined with the test results of multiple groups of parallel samples show that the self-corrosion current density I measured when the static pressure stress is 0MPa corr and self-corrosion potential E corr Similarly, the reproducibility between parallel samples is good, which can eliminate the influence of accidental factors in the experiment, and the test results of the device are reliable and stable.

[0096] image 3 and Figure 4 It is the AC impedance spectru...

Embodiment 2

[0106] The applied static compressive stress is 1.5MPa.

[0107] The test results are shown in Table 2 below.

[0108] Figure 5 Polarization curves of corrosion electrochemical behavior test results in Hank’s solution for Mg-4Li-1Ca alloy samples loaded with 1.5MPa static pressure stress.

[0109] like Figure 5 As shown, the three curves in the figure are the polarization curves of three parallel samples under the same experimental conditions. Polarization curves 1, 2, 3 correspond to the self-corrosion current density I of the sample corr and self-corrosion potential E corr As shown in table 2.

[0110] The electrochemical parameters in Table 2, combined with the test results of multiple groups of parallel samples, show that the self-corrosion current density I measured when the static pressure stress is 1.5MPa corr and self-corrosion potential E corr Similar, the reproducibility between parallel samples is good, the test results of this experimental device are stabl...

Embodiment 3

[0119] The applied static compressive stresses were 0.0MPa, 1.5MPa, and 3.0MPa, respectively.

[0120] The test results are shown in Table 3 below.

[0121] Figure 8 Polarization curves of the corrosion electrochemical behavior test results in Hank’s solution for Mg-4Li-1Ca alloy samples under different static pressure stress conditions.

[0122] like Figure 8 As shown in the figure, under 0MPa, 1.5MPa, 3MPa compressive stress, the electrochemical polarization curves of the Mg-4Li-1Ca alloy sample in Hank's solution, and the polarization curves in the figure were fitted to calculate its own Corrosion potential E corr and self-corrosion current density I corr . Self-corrosion potential E corr is the electrochemical thermodynamic quantity of corrosion, the higher the negative value, the stronger the corrosion tendency of the material in the solution in the system, and the material is prone to electrochemical corrosion; while the self-corrosion current density I corr is ...

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Abstract

The invention discloses a magnesium alloy static pressure stress corrosion electrochemical behavior simulation experiment device and an experiment method thereof, wherein the simulation experiment device includes an electrolyte tank, a test device, a computer terminal and an electrochemical workstation. Among them, the test device is placed in the electrolyte tank; the electrolyte in the electrolyte tank is forced to circulate and peristaltic by a high-precision peristaltic pump. The overall structure of the simulation experiment device is simple, and the static pressure can be continuously adjusted. The experimental method adjusts the screw of the test device to apply different static pressure stresses to the magnesium alloy samples, and adjusts the flow rate of the electrolyte through a peristaltic pump to simulate the microenvironment of the organism in vitro to conduct open circuit potential, polarization A series of electrochemical test operations such as curve, AC impedance spectrum and electrochemical noise, the test results are real and stable, and the reproducibility and reproducibility are good. The invention can fully satisfy the related research and use of the magnesium alloy bearing the static pressure stress in the human bone microenvironment.

Description

technical field [0001] The invention relates to a magnesium alloy corrosion electrochemical behavior simulation experiment device and an experiment method thereof, in particular to a magnesium alloy static pressure stress corrosion electrochemical behavior simulation experiment device and an experiment method thereof, belonging to the field of electrochemistry. technical background [0002] Biomedical materials include materials that can be medically implanted into organisms or combined with organism tissues, and are mainly used to treat or replace damaged tissues and organs in organisms to correct, compensate or improve their functions. [0003] In the field of medicine and health, degradable medical metal materials have been vigorously developed, and are widely used in biological tissue engineering materials, internal sutures, surgical bone setting materials, etc., and have a good application prospect. Biomedical metal materials are required to have the following propertie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/02G01N3/08
CPCG01N3/08G01N17/02
Inventor 曾荣昌丁自友戚威臣崔蓝月殷正正张芬李硕琦张伟伟邹玉红
Owner SHANDONG UNIV OF SCI & TECH
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