CN112268857B - Experimental test device and method for simulating dynamic crevice corrosion of artificial joint - Google Patents
Experimental test device and method for simulating dynamic crevice corrosion of artificial joint Download PDFInfo
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Abstract
The invention provides an experimental test device and method for simulating dynamic crevice corrosion of an artificial joint, wherein the device comprises: the device comprises a polytetrafluoroethylene container, a sample fixing seat, a concave contact element and a three-electrode electrochemical test system, wherein simulated body fluid is contained in the polytetrafluoroethylene container, the sample fixing seat is fixed at the central position of the bottom of the polytetrafluoroethylene container, and the sample fixing seat is used for fixing a sample; the concave contact piece is arranged above the sample fixing seat and is connected with the friction wear equipment; the three-electrode electrochemical test system comprises a platinum sheet counter electrode, an Ag/AgCl reference electrode and a working electrode, wherein a sample is used as the working electrode, and the three-electrode electrochemical test system is connected with electrochemical test equipment. The invention can simulate the real situation of the artificial joint in the dynamic service process, realize dynamic crevice corrosion monitoring, reflect the crevice corrosion resistance of the artificial joint material and provide reliable reference for material selection or material performance optimization.
Description
Technical Field
The invention relates to the technical field of artificial joint material crevice corrosion tests, in particular to an experimental test device and method for simulating dynamic crevice corrosion of an artificial joint.
Background
Since the 21 st century, the number of joint diseases has increased with the progress of the aging phenomenon in China, and the pursuit of health by people has become more concrete with the overall improvement of living standard. Biomedical materials are increasingly in demand, but have the problem of failure caused by corrosion and abrasion after being implanted into a human body. Taking the hip joint as an example, the total replacement type hip joint mainly comprises an acetabulum, a femoral head and a bone stem. The bone handle is mechanically combined with the femoral head and fixed on the human femur. In the service process, sliding friction is generated between the femoral head and the acetabulum; the joint of the femoral head and the bone handle and the joint of the bone handle and the femur can generate micro-motion friction. The corrosion products of the connecting parts which are subjected to frictional wear are observed in the artificial joint taken out of service for a certain time, and the occurrence of crevice corrosion is indicated.
With the development of material science and engineering technology, practical and durable materials are receiving more and more attention, so that the corrosion resistance embodied in the interaction process of the materials and the surrounding environment is one of the most considered factors. In typical localized corrosion, crevice corrosion occurs with crevice widths of 0.025mm to 0.15mm, and within this range the solution is in a stagnant state. Crevice corrosion of passivated metals involves an incubation period that is not easily monitored and a rapidly developing extension period. The oxygen concentration difference battery generated by mass transfer resistance enables parameters such as components, ion concentration, pH and the like of solution in the gap to change towards the direction of corrosion acceleration, and finally the corrosion rate increased in different degrees and the formed corrosion morphology are utilized to evaluate the gap corrosion resistance of the material.
A typical crevice corrosion test includes a three-electrode electrochemical test system. The system can judge the reaction process, analyze the corrosion behavior and summarize the rule mechanism by testing the response of the material to the voltage and the current density in the corresponding medium. Through comparative analysis of the experimental methods in national standards and literatures, the experimental testing device for crevice corrosion commonly used at present is summarized and mainly has the following defects:
the national standard GB/T13671 stainless steel crevice corrosion electrochemical test method is used for evaluating crevice corrosion resistance of a material, and a constant potential is applied to a crevice clamp device (a sample, a nylon net and a mold) in a sodium chloride solution to accelerate corrosion experiment progress, but crevice geometry is single and uncontrollable, and crevice corrosion under different crevice geometries cannot be explored. The traditional gap corrosion experiment testing device is biased to independently perform a static gap corrosion experiment or a friction and wear experiment, which are difficult to accurately simulate the complex motion mode of the artificial joint in the service process. The high-tech artificial joint simulator with obvious simulation effect is not applied to general experiments due to complex operation and high test cost.
Therefore, a device which can accurately simulate the complex motion mode of the artificial joint in the service process and has strong operability needs to be constructed: the experimental test device is used for simulating the dynamic crevice corrosion of the artificial joint, and a corresponding experimental method is designed.
Disclosure of Invention
The invention aims to provide an experimental test device and method for simulating dynamic joint crevice corrosion of an artificial joint, which can simulate the real situation of the artificial joint in the dynamic service process, realize dynamic crevice corrosion monitoring, reflect crevice corrosion resistance of an artificial joint material, and provide reliable reference for material selection or material performance optimization.
In order to achieve the purpose, the invention provides the following scheme:
an experimental test device for simulating dynamic crevice corrosion of an artificial joint, comprising: the test device comprises a polytetrafluoroethylene container, a sample fixing seat, a concave contact element and a three-electrode electrochemical test system, wherein simulated body fluid is contained in the polytetrafluoroethylene container and is used for simulating the real service environment of the artificial joint; the sample fixing seat is fixed at the central position of the bottom of the polytetrafluoroethylene container and used for fixing a sample, and the sample is made of an artificial joint material; the concave contact piece is arranged above the sample fixing seat and is connected with the friction wear equipment; the three-electrode electrochemical test system comprises a platinum sheet counter electrode, an Ag/AgCl reference electrode and a working electrode, wherein the sample is used as the working electrode, the Ag/AgCl reference electrode is arranged in a salt bridge, the tip of the salt bridge is close to but not in contact with the sample, and the platinum sheet counter electrode is vertically arranged and close to the sample; the three-electrode electrochemical test system is connected with electrochemical test equipment; the concave contact piece moves under the driving of the friction wear equipment, and different dynamic gaps are formed between the concave contact piece and the test sample.
Optionally, the friction and wear device is a UMT-2 bruke friction and wear tester.
Optionally, a cuboid bulge which is coplanar with the two sides of the concave contact piece is arranged in the center of the concave contact piece, the two sides of the concave contact piece are covered outside the sample, and the cuboid bulge and the middle concave embedding table of the concave contact piece act on the sample to respectively form a central friction wear area and a surrounding dynamic gap corrosion area on the sample.
Optionally, the sample fixing seat is a convex step, the sample fixing seat is integrally arranged at the central position of the bottom of the polytetrafluoroethylene container, and a groove for fixing the sample is formed in the convex step.
Optionally, the simulated body fluid is normal saline or a Flank's solution.
Optionally, the concave contact piece is made of polytetrafluoroethylene.
The invention also provides an experimental test method for simulating the dynamic crevice corrosion of the artificial joint, which is applied to the experimental test device for simulating the dynamic crevice corrosion of the artificial joint and comprises the following steps:
and 5, immediately taking out the sample from the experimental testing device for simulating the dynamic crevice corrosion of the artificial joint after the experiment is finished, and observing and analyzing the macro-micro morphology of the surface of the subsequent material.
Optionally, in step 1, a packaging sample of the artificial joint material is prepared, and the sample is subjected to pretreatment, which specifically includes:
preparing or selecting an artificial joint material for experimental test, machining the artificial joint material into a sample with a certain shape, roughly and mechanically polishing the sample to remove a rust layer, packaging, and mechanically polishing to a mirror surface;
the packaging method comprises the following steps: positioning a PVC mould and a sample of a soldering lead on a horizontal plane, pouring anhydrous ethylenediamine and epoxy resin which are uniformly mixed according to a fixed proportion into the PVC mould, removing air bubbles in the mixture to prevent gaps from being generated around the sample, standing, and forming a packaging sample after the epoxy resin mixture is fixed.
Optionally, in step 3, the sample is fixed in the sample fixing seat, and the concave contact element with a certain concave insertion depth is mounted, specifically including:
fixing a sample on the convex step, wherein a lead on the sample extends out of the device from the side opening of the convex step;
the friction wear testing system is installed, the lower test piece is a test sample, the upper test piece is a concave contact piece, the concave contact piece is connected with friction wear equipment through a bolt, concave two sides of the concave contact piece are covered outside the test sample, different gap widths are controlled by different concave embedding depths of the concave contact piece, and the concave embedding depths are set according to experimental requirements.
Optionally, in step 4, the dynamic crevice corrosion experiment is performed in a simulated body fluid environment, which specifically includes:
the concave contact piece is driven by the friction and wear equipment to reciprocate up and down above the sample, and dynamic experiments of different loads, amplitudes and frequencies are realized under the drive of the friction and wear equipment;
the cuboid bulge of the concave contact element acts on the sample to form a friction wear area in the center of the sample, the concave middle of the concave contact element is embedded into the position to realize solution disturbance with fixed gap width, and dynamic gap corrosion is formed in the rest area of the sample;
and the electrochemical test equipment monitors the response of voltage and current density under the conditions of different gap widths and different motion modes and analyzes the dynamic gap corrosion behavior of the artificial joint material.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention provides an experimental test device and method for simulating dynamic crevice corrosion of an artificial joint, wherein the experimental test device consists of a sample fixing seat for fixing a sample, a polytetrafluoroethylene container for containing simulated body fluid and friction and wear equipment, wherein a lower sample of the friction and wear equipment is a sample, an upper sample of the friction and wear equipment is a concave contact element, the concave contact element moves under the driving of the friction and wear equipment, and a friction and wear area in the center of the sample and a dynamic crevice corrosion area around the sample are formed in reciprocating motion; the three-electrode polarization system is connected with an electrochemical testing device, objectively reflects the crevice corrosion resistance of the artificial joint material through the surface appearance of the sample and electrochemical parameters, and provides a certain reference value for material selection or material performance optimization; in the experimental test method, the dynamic crevice corrosion comprises two states, wherein one state is horizontal disturbance of solution for keeping the geometrical shape of the crevice unchanged, and the other state is friction wear generated by horizontal relative motion of materials; in dynamic crevice corrosion, the influence of a mechanically damaged surface passivation film on corrosion is researched by utilizing an experiment that the material horizontally moves relative to each other to generate friction and wear.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of a disassembled structure of an experimental test device for simulating the dynamic crevice corrosion of an artificial joint according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a self-contained structure of an experimental testing device for simulating dynamic crevice corrosion of an artificial joint according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of an experimental test apparatus for simulating dynamic crevice corrosion of an artificial joint in accordance with an embodiment of the present invention;
FIG. 4 is a flowchart of an experimental testing method for simulating dynamic crevice corrosion of an artificial joint according to an embodiment of the present invention.
Reference numerals: 1. a polytetrafluoroethylene container; 2. a salt bridge; 3. an Ag/AgCl reference electrode; 4. a concave contact; 4-1, rectangular protrusions; 5. a platinum sheet counter electrode; 6. a sample; 7. sample fixing seat.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide an experimental test device and method for simulating dynamic joint crevice corrosion of an artificial joint, which can simulate the real situation of the artificial joint in the dynamic service process, realize dynamic crevice corrosion monitoring, reflect crevice corrosion resistance of an artificial joint material, and provide reliable reference for material selection or material performance optimization.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1 to 3, an experimental testing apparatus for simulating dynamic crevice corrosion of an artificial joint provided by an embodiment of the present invention includes: the test device comprises a polytetrafluoroethylene container 1, a sample fixing seat 7, a concave contact element 4 and a three-electrode electrochemical test system, wherein simulated body fluid is contained in the polytetrafluoroethylene container 1 and is used for simulating the real service environment of the artificial joint; the sample fixing seat 7 is fixed at the central position of the bottom of the polytetrafluoroethylene container 1, the sample fixing seat 7 is used for fixing a sample 6, and the sample 6 is made of an artificial joint material; the concave contact element 4 is arranged above the sample fixing seat 7 and is connected with friction wear equipment; the three-electrode electrochemical test system comprises a platinum sheet counter electrode 5, an Ag/AgCl reference electrode 3 and a working electrode, wherein the sample 6 is used as the working electrode, the Ag/AgCl reference electrode 3 is arranged in a salt bridge 2, the tip of the salt bridge 2 is close to but not in contact with the sample 6, and the platinum sheet counter electrode 5 is vertically arranged and close to the sample 6; the three-electrode electrochemical test system is connected with electrochemical test equipment; the female contact piece 4 moves under the driving of the friction and wear device, and different dynamic gaps and contact friction are formed between the female contact piece and the test sample 6.
The friction and wear equipment is a UMT-2 Bruk friction and wear testing machine.
The center of the concave contact element 4 is provided with a cuboid bulge 4-1 which is coplanar with the two sides of the concave contact element 4, the two sides of the concave contact element 4 are covered outside the sample 6, and the middle concave embedding table of the cuboid bulge 4-1 and the concave contact element 4 acts on the sample 6 to respectively form a friction wear area in the center of the sample 6 and a dynamic gap corrosion area around the sample 6.
The sample fixing seat 7 is a convex step integrally arranged at the central position of the bottom of the polytetrafluoroethylene container 1, and a groove for fixing the sample is formed in the convex step.
The simulated body fluid is normal saline or a Flank's solution. The concave contact element 4 is made of polytetrafluoroethylene.
As shown in fig. 4, the present invention further provides an experimental testing method for simulating the dynamic crevice corrosion of the artificial joint, which is applied to the above experimental testing apparatus for simulating the dynamic crevice corrosion of the artificial joint, and comprises the following steps:
and 5, immediately taking out the sample 6 from the experimental testing device for simulating the dynamic crevice corrosion of the artificial joint after the experiment is finished, and observing and analyzing the macro-micro morphology of the surface of the subsequent material.
In step 1, preparing a packaging sample of the artificial joint material, and performing pretreatment on the sample, specifically comprising:
preparing or selecting an artificial joint material for experimental test, machining the artificial joint material into a sample with a certain shape, roughly and mechanically polishing the sample to remove a rust layer, packaging, and mechanically polishing to a mirror surface;
the packaging method comprises the following steps: positioning a PVC mould and a sample of a soldering lead on a horizontal plane, pouring anhydrous ethylenediamine and epoxy resin which are uniformly mixed according to a fixed proportion into the PVC mould, removing air bubbles in the mixture to prevent gaps from being generated around the sample, standing, and forming a packaging sample after the epoxy resin mixture is fixed.
In step 3, fix sample 6 in sample fixing base 7 to the concave contact piece of certain concave type embedding depth is installed, specifically includes:
fixing a sample 6 on the convex step, and leading wires on the sample to extend out of the device from the side opening of the convex step;
the friction wear testing system is installed, the lower test piece is a test piece 6, the upper test piece is a concave contact piece 4, the concave contact piece is connected with friction wear equipment through a bolt, concave two sides of the concave contact piece are covered outside the test piece, different gap widths are controlled by different concave embedding depths of the concave contact piece, and the concave embedding depths are set according to experiment requirements.
In the step 4, a dynamic crevice corrosion experiment is performed in a simulated body fluid environment, which specifically comprises:
the concave contact element 4 is driven by friction and wear equipment to reciprocate up and down above the sample 6, and dynamic experiments of different loads, amplitudes and frequencies are realized under the drive of the friction and wear equipment;
the middle concave embedding platforms of the cuboid bulge 4-1 and the concave contact element 4 act on the sample 6 to respectively form a friction wear area in the center of the sample and a dynamic gap corrosion area around the sample;
and the electrochemical test equipment monitors the response of voltage and current density under the conditions of different gap widths and different motion modes and analyzes the dynamic gap corrosion behavior of the artificial joint material.
The invention takes a dynamic crevice corrosion experiment test process of the CoCrMo alloy in a simulated body fluid environment as a practical example, and the experiment process is as follows:
the first step is as follows: preparing a packaging sample of the artificial joint material and carrying out pretreatment on the sample.
Machining a CoCrMo bar into a thickness of 18X 10X 3mm3The sheet was rough mechanically polished to remove surface rust, the wire was soldered to the back, and the conductivity between the sample and the distal end of the wire was measured by an multimeter. Fixing a PVC pipe die (with the height of 5mm and the diameter of phi 25mm) and a centered sample with the front surface facing downwards on a horizontal plane by using a double-sided adhesive tape, wherein a sample lead extends out of a through hole on one side of the PVC pipe die; and pouring anhydrous ethylenediamine and epoxy resin which are uniformly mixed according to a certain fixed proportion into a PVC pipe die, removing air bubbles in the mixture to prevent gaps from being generated around the sample, standing for a period of time, and forming the artificial joint material packaging sample after the epoxy resin mixture is fixed. And performing pretreatment on the packaged sample, sequentially and mechanically polishing the sample by using 600#, 1000#, 1500#, 2000#, 3000# and 5000# sandpaper, polishing the sample to a mirror surface by using w1.5 polishing paste, washing the mirror surface by using deionized water and alcohol, and drying the mirror surface by using a blower with cold air.
The second step is that: preparing physiological saline or Flank's solution and the like simulated body fluid.
The corrosion medium is a simulated body fluid, the prepared solution is generally 0.9% NaCl aqueous solution (normal saline), and the solution does not contain various ions contained in the real body fluid, but meets the requirement of simple corrosion simulation. The Flank's solution is a relatively complex artificial simulated body fluid, glucose, sulfate radical and other elements and ions existing in the body fluid are added on the basis of a phosphate buffer solution, the components of the solution are closer to the body fluid, and the simulated body fluid to be prepared is selected according to experimental requirements.
The third step: the sample is held and a female contact of a certain thickness is mounted.
As shown in the disassembled view of fig. 1, firstly, the sample 6 is fixed on the sample fixing seat 7 at the center of the bottom of the teflon container 1, and the conducting wire on the sample 6 extends out of the device from the side opening of the sample fixing seat 7. And installing a friction wear test system, wherein the lower test piece is a test sample 6, and the upper test piece is a polytetrafluoroethylene concave contact piece 4. As shown in fig. 2, two sides of the concave contact 4 reciprocate on the sample holder 7 made of epoxy resin and teflon outside the sample 6, and different concave embedding depths control different gap widths. The central cuboid projection 4-1 which is kept in the same plane with the two sides of the concave contact element 4 is finally formed into a central friction wear area and a surrounding dynamic gap corrosion area on the sample 6. The cross-sectional view of the experimental test apparatus a-a for dynamic crevice corrosion in fig. 3 clearly illustrates the contact condition of the female contact 4.
The fourth step: and placing a three-electrode electrochemical test system, and carrying out a dynamic crevice corrosion experiment in a simulated body fluid environment.
The three-electrode electrochemical test system is placed in a polytetrafluoroethylene container 1 containing a configured corrosive medium. According to the arrangement of the experimental test device diagram of the integral dynamic crevice corrosion shown in FIG. 2, a platinum sheet counter electrode 5 is vertically arranged and close to an artificial joint material working electrode; the tip of the salt bridge 2, where the Ag/AgCl reference electrode 3 is placed, is as close as possible to but not touching the sample 6.
The UMT-2 Bruk friction wear testing machine drives the concave contact element 4, and the three-electrode system is connected with electrochemical testing equipment. And changing different conditions to carry out dynamic crevice corrosion experiments. The temperature was changed using a thermostatic water bath, the effect of temperature on the experiment was explored, and the reaction progress was accelerated by raising the temperature. The friction parameters of different frequencies, amplitudes, durations and micro loads are used to explore the influence on the friction wear and the influence on the dynamic gap corrosion. And simultaneously measuring electrochemical parameters such as open circuit, a potentiodynamic polarization curve, constant potential polarization, impedance and the like. It is also possible to alter ions (e.g. Cl) in the etching medium-And H+) And the concentration of the solution is further simulated to change in the crevice corrosion expansion stage, so that the corrosion mechanism of different crevice corrosion stages is explored.
The fifth step: and observing and analyzing macro-micro morphology of the surface of the material at the later stage.
And after the corrosion experiment is finished, immediately taking the sample 6 out of the experimental testing device for simulating the dynamic crevice corrosion of the artificial joint, and observing and analyzing the subsequent surface macro-micro morphology by using a laser confocal microscope, SEM, EDS, XPS, AFM and the like.
According to the experimental test device and the method for simulating the dynamic crevice corrosion of the artificial joint, provided by the invention, through the design of the experimental test device for simulating the dynamic crevice corrosion of the artificial joint, a complex motion mode of the artificial joint in the service process can be accurately simulated, and the operability is very strong; the method can accurately simulate the real situation of the artificial joint in the dynamic service process, further analyze the crevice corrosion behavior of the artificial joint material in different states, summarize the rule, explore the mechanism, and has great significance for promoting the theoretical research and development of dynamic crevice corrosion in the aspect of scientific research and academia; in the aspect of engineering application, the method has important value for prolonging the service life of the artificial joint and optimizing medical design.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. An experimental testing device for simulating dynamic crevice corrosion of an artificial joint, comprising: the test device comprises a polytetrafluoroethylene container, a sample fixing seat, a concave contact element and a three-electrode electrochemical test system, wherein simulated body fluid is contained in the polytetrafluoroethylene container and is used for simulating the real service environment of the artificial joint; the sample fixing seat is fixed at the central position of the bottom of the polytetrafluoroethylene container and used for fixing a sample, and the sample is made of an artificial joint material; the concave contact piece is arranged above the sample fixing seat and is connected with the friction wear equipment; the three-electrode electrochemical test system comprises a platinum sheet counter electrode, an Ag/AgCl reference electrode and a working electrode, wherein the sample is used as the working electrode, the Ag/AgCl reference electrode is arranged in a salt bridge, the tip of the salt bridge is close to but not in contact with the sample, and the platinum sheet counter electrode is vertically arranged and close to the sample; the three-electrode electrochemical test system is connected with electrochemical test equipment; the concave contact piece moves under the driving of the friction and wear equipment, and different dynamic gaps and contact friction are formed between the concave contact piece and the sample;
the center of the concave contact element is provided with a cuboid bulge which is coplanar with the two sides of the concave contact element, the two sides of the concave contact element are covered outside the sample, the cuboid bulge and the middle concave embedding platform of the concave contact element act on the sample to respectively form a central friction wear area and a surrounding dynamic gap corrosion area on the sample.
2. The experimental testing device for simulating dynamic crevice corrosion of an artificial joint as claimed in claim 1, wherein said frictional wear apparatus is a UMT-2 bruke frictional wear tester.
3. The experimental test device for simulating the dynamic crevice corrosion of the artificial joint as claimed in claim 1, wherein the sample holder is a convex step integrally formed at the central position of the bottom of the teflon container, and the convex step is provided with a groove for fixing the sample.
4. The experimental test device for simulating dynamic crevice corrosion of an artificial joint according to claim 1, wherein the simulated body fluid is normal saline or Flank's solution.
5. The experimental testing device for simulating dynamic crevice corrosion of an artificial joint according to claim 1, wherein the female contact member is made of teflon.
6. An experimental test method for simulating the dynamic crevice corrosion of the artificial joint, which is applied to the experimental test device for simulating the dynamic crevice corrosion of the artificial joint, which is disclosed by any one of claims 1 to 5, and is characterized by comprising the following steps:
step 1, preparing a packaging sample of the artificial joint material, and carrying out pretreatment on the sample;
step 2, preparing a simulated body fluid such as normal saline or Flank's solution;
step 3, fixing the sample in the sample fixing seat, and installing a concave contact piece with a certain concave embedding depth;
step 4, adding simulated body fluid into a polytetrafluoroethylene container to simulate the real service environment of the artificial joint, setting experiment parameters as required, placing a three-electrode electrochemical test system, connecting electrochemical test equipment, and performing a dynamic crevice corrosion experiment in the simulated body fluid environment;
in the step 4, a dynamic crevice corrosion experiment is performed in a simulated body fluid environment, which specifically comprises:
the concave contact piece is driven by the friction and wear equipment to reciprocate up and down above the sample, and dynamic experiments of different loads, amplitudes and frequencies are realized under the drive of the friction and wear equipment;
the cuboid bulge of the concave contact element acts on the sample to form a friction wear area in the center of the sample, the concave middle of the concave contact element is embedded into the position to realize solution disturbance with fixed gap width, and dynamic gap corrosion is formed in the rest area of the sample;
monitoring the response of voltage and current density under the conditions of different gap widths and different motion modes by electrochemical test equipment, and analyzing the dynamic gap corrosion behavior of the artificial joint material;
and 5, immediately taking out the sample from the experimental testing device for simulating the dynamic crevice corrosion of the artificial joint after the experiment is finished, and observing and analyzing the macro-micro morphology of the surface of the subsequent material.
7. The experimental test method for simulating the dynamic crevice corrosion of the artificial joint as claimed in claim 6, wherein in step 1, the preparation of the packaging sample of the artificial joint material and the pre-treatment of the sample comprise:
preparing or selecting an artificial joint material for experimental test, machining the artificial joint material into a sample with a certain shape, roughly and mechanically polishing the sample to remove a rust layer, packaging, and mechanically polishing to a mirror surface;
the packaging method comprises the following steps: positioning a PVC mould and a sample of a soldering lead on a horizontal plane, pouring anhydrous ethylenediamine and epoxy resin which are uniformly mixed according to a fixed proportion into the PVC mould, removing air bubbles in the mixture to prevent gaps from being generated around the sample, standing, and forming a packaging sample after the epoxy resin mixture is fixed.
8. The experimental test method for simulating the dynamic crevice corrosion of the artificial joint according to claim 6, wherein in step 3, the sample is fixed in the sample holder, and the female contact element with a certain female insertion depth is mounted, specifically comprising:
fixing a sample on the convex step, wherein a lead on the sample extends out of the device from the side opening of the convex step;
the friction wear testing system is installed, the lower test piece is a test sample, the upper test piece is a concave contact piece, the concave contact piece is connected with friction wear equipment through a bolt, concave two sides of the concave contact piece are covered outside the test sample, different gap widths are controlled by different concave embedding depths of the concave contact piece, and the concave embedding depths are set according to experimental requirements.
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