An electrode device for detecting the electrochemical performance of porous coating materials

Abstract

The invention discloses an electrode device for detecting the electrochemical performance of a porous coating material. The electrode device comprises a front gland, a conductive column and a back protection base. Two communicated blind holes are formed in the back protection base, one blind hole is an electrode installation hole where the conductive column is installed, and the other blind hole is a wiring hole where a wire or a conductor is led out. The back end of the conductive column is detachably installed in the electrode installation hole, and the front end of the conductive column is sleeved with the front gland and detachably connected with the front gland. The front gland is in a cylinder shape with an opening in one end, and the opening of the cylinder shape is detachably connected with the front end of the conductive column. A through hole is formed in the bottom face of the cylinder shape to serve as a detection opening. A sample anti-leakage sealing ring is further arranged on the bottom face of the cylinder shape and provided with a through hole matched with the detection opening in size. By means of the electrode device, side leakage of electrolytes can be effectively prevented, temperature changes of a tested electrode can be monitored in real time, the detection result is accurate, use is convenient, and detection accuracy is high.

Description

technical field [0001] The invention belongs to the field of material performance testing equipment, in particular to an electrode device for testing the electrochemical performance of porous coating materials. Background technique [0002] With the aging of the population, the increase of diseases and various accidents, the clinical demand for various biological implant materials is increasing. At present, human implant materials have been widely used in artificial joints, artificial bones, artificial dentures, oral restoration and heart surgery. The metal implants used earlier were made of stainless steel, such as the original 304 stainless steel and the later 316 immortal steel, as well as titanium alloys used in large quantities. But all metals currently face a huge problem when implanted into the human body-poor surface bioactivity, and the elastic modulus of the material does not match that of bone tissue. In order to solve this problem, the solution of material surf...

AI Technical Summary

Problems solved by technology

However, most bio-coating materials have a porous structure. When using this method to detect the electrochemical characteristics of porous bio-coating materials and the corrosion behavior in physiological environments, there are still technical problems that cannot be solved. The characteristics of the coating material itself and the influence of the experimental environment will lead to distortion of the test results

Specifically, in practical applications, materials with porous biological coatings are often made into edge-sealed devices (the material has no cross section, and the surface is fully covered by the coating), while in detection, small pieces of material are often used (the material has The cross section is the side of the test sample, the base part of the side is not covered by the coating), if the current commonly used sample front (coating surface) is used to seal during the test, it will cause the electrolyte to penetrate from the pores of the porous coating to the side of the base and The back side causes corrosion on the back and sides of the substrate, which affects the accuracy of the test results

Moreover, the metal may undergo heat changes during the corrosion process, resulting in a difference between the measured electrolyte temperature and the substrate temperature, which will also lead to inaccurate traditional temperature measurement methods, resulting in deviations in test results

[0004] In addition, when using the existing electrochemical testing methods to detect coated materials, the sample mounting method is often used to make the sample. This method requires welding the wire and the sample together, and the wire and the sample only pass through the welding point. Connection, some metals are difficult to form a stable welding combination with the wire, resulting in poor conductivity and easy disconnection, which affects the accuracy of the test results; and the mounting resin is often immersed in the coating due to operational reasons, which affects The pore structure and porosity of the coating; in addition, the preparation of the sample during the mounting process is complicated, and when multiple materials need to be tested, the detection efficiency will be significantly reduced

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