Sensor for electrochemical detection on surface defects of metal material and use method of sensor
A technology for detecting sensors and metal materials, which is applied in the field of surface defect detection, can solve problems such as human health hazards and environmental pollution, and achieve the effects of safe detection in the whole process, broad application prospects, and simple operation
Active Publication Date: 2014-02-26
TIANJIN SPECIAL EQUIP INSPECTION INST
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Problems solved by technology
[0003] In addition to the above two detection methods, there are eddy current testing, ultrasonic testing (UT) and ray testing (RT). harmful to human health and pollute the environment
[0004] At present, no one has detected the surface defects of metal materials through electrochemical testing methods.
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Embodiment Construction
[0026] The present invention will be further described below through specific examples.
[0027] Such as figure 1 As shown, the electrochemical detection sensor for surface defects of metal materials of the present invention comprises a PVC mesh plastic plate 2, which is a soft circular material with a thickness of 4 to 8 mm and a diameter of 50 mm, on which a plurality of mounting holes 6 are arranged. , the number of mounting holes is determined according to the size of the tested specimen area. A reference electrode 3 is arranged in the central installation hole of the PVC mesh plastic plate 2, and the reference electrode 3 (RE) is a solid Ag-AgCl electrode, which adopts a silver wire with a diameter of 2 mm and a length of 40 mm, which is cleaned with acetone , then wash the surface with distilled water, wipe it with absolute ethanol and blow it dry, and then immerse either end in molten silver chloride for 15 minutes, and this end is used as the working surface of the re...
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Abstract
The invention discloses a sensor for electrochemical detection on surface defects of a metal material and a use method of the sensor. The sensor comprises a PVC (Poly Vinyl Chloride) net-shaped plastic plate and a sandwich rubber, wherein the PVC net-shaped plastic plate is made from a soft round material with thickness of 4-8mm and provided with an installation hole and a reference electrode; auxiliary electrodes are symmetrically arranged at the periphery of the reference electrode; the reference electrode and the auxiliary electrodes are round and fixedly arranged on the PVC net-shaped plastic plate through the sandwich rubber; the reference electrode is a fixed Ag-AgCl electrode; and the auxiliary electrodes are the same as a detected sample in material as much as possible. The sensor can be changed at will in using shape; by detected electrochemical impedance spectrums and detected noise time domain spectrums of different parts of the sample, the parts where the surface defects are located of the sample can be determined; and the sensor and the use method of the sensor are simple in operation and strong in practicability.
Description
technical field [0001] The invention relates to an electrochemical method for detecting surface defects of metal materials, and specifically relates to the technical field of detection methods for surface defects. Background technique [0002] The common non-destructive testing methods for surface defects of metal materials mainly include magnetic particle testing (MT), which uses the interaction between the leakage magnetic field at the defect of the workpiece and the magnetic powder, that is, the surface and near-surface defects of steel products (such as cracks, slag inclusions, hairlines, etc.) etc.) The difference between the magnetic permeability and the magnetic permeability of steel. After magnetization, the magnetic field at the discontinuity of these materials will change, forming a part of the magnetic flux leakage. —Magnetic traces, under appropriate lighting conditions, show the position and shape of the defect, observe and explain the accumulation of these magn...
Claims
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IPC IPC(8): G01N27/26G01N27/30
Inventor 高志明党丽华王迎修妍刘永长张国胜
Owner TIANJIN SPECIAL EQUIP INSPECTION INST