Method for detecting local corrosion of material by electrochemical noise technology, noise probe and manufacturing method of the noise probe

Abstract

The invention relates to a method for detecting local corrosion of a material by an electrochemical noise technology, a noise probe and a manufacturing method of the noise probe. The noise probe is arranged at a position 1mm away from a material needing to be detected; the material needing to be detected is used as a working electrode; the material needing to be detected and the noise probe are connected to an electrochemical workstation by leads; the noise probe comprises a core column prepared from a material the same as the material needing to be detected, and also comprises a powder paint seal layer which is coated on outer parts of the core column but ends. The method can realize a local corrosion test of a measurable material in a polarization-free natural state, is based on a traditional electrochemical noise test technology and a scanning electrochemical microscope test principle, can detect local corrosion of the material in a natural state, does not introduce any additional signals or polarization, is an electrochemical test method for real-time, on-line, in-situ and lossless reflection of local corrosion of the material, and can guarantee real material test data in a natural corrosion state.

Description

technical field [0001] The invention relates to a material corrosion detection method. The invention also relates to a noise probe used in a material corrosion detection method. Background technique [0002] Some materials with better resistance to uniform corrosion are prone to local corrosion such as pitting corrosion and stress corrosion cracking. Since local corrosion is not easy to be detected, local corrosion is more dangerous than uniform corrosion and has a greater impact on the safety of materials. . The traditional electrochemical test method is limited to detecting the macroscopic changes of the whole sample, and the test results only reflect the overall statistical results of different local positions of the sample, and cannot reflect the mechanism and process of local corrosion and the interaction between materials and the environment. The microprobe can distinguish the difference in electrochemical properties of different regions of the material, and can dete...

AI Technical Summary

Problems solved by technology

But it also has certain problems. The galvanic corrosion between dissimilar materials avoids the phenomenon of non-polarization, and the generated polarization current will make the material deviate from the natural corrosion, which makes the obtained results deviate.

Images