Non-destructive testing device and method for on-line monitoring and detection of galvanic corrosion sensitivity of metal welded joints

Abstract

The invention discloses a non-destructive testing device and method for on-line monitoring and detection of galvanic corrosion sensitivity of metal welding joints. Firstly, according to the surface shape and material of the weld area, a suitable electrode probe bundle is selected and the curved surface of the probe bundle is adjusted. Select a suitable reference electrode and salt bridge according to the electrolyte solution, and use a suitable device to fix the probe bundle and reference electrode. The potential and current signals are then collected using a device with a zero-resistance circuit, and the probes of all electrode probe bundles are sampled sequentially. Finally, the collected current signal is analyzed and processed, and the current distribution diagram is output to determine the cathode and anode areas on the surface of the sample and judge the galvanic corrosion sensitivity of each part of the welded joint. This method can realize continuous on-line monitoring and detection of the galvanic corrosion sensitivity of each part of the metal welded joint, ensuring the accuracy of the detection of the galvanic corrosion sensitivity of the metal welded joint in a non-destructive state, thereby greatly improving the life of the metal welded joint Reliability and accuracy of assessments.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing, and specifically collects current signals on the surface of welded joints and draws to obtain a current distribution diagram, and then obtains galvanic corrosion sensitivity information on the surface of a sample. Background technique [0002] Galvanic corrosion (also known as contact corrosion) means that when two or more different metals are in contact in a conductive medium, they form a corrosion cell due to their different electrode potentials. The metal with a relatively positive self-corrosion potential is the cathode, and the cathodic reaction occurs, which leads to the inhibition of its corrosion process; while the metal with a relatively negative potential is the anode, and the anodic reaction occurs, which leads to the acceleration of the corrosion process, especially when the anode area is small. The galvanic pair with anode and cathode increases corrosion. At present,...

AI Technical Summary

Problems solved by technology

These can only obtain weight loss data and surface corrosion morphology, but cannot obtain corrosion current data

and takes a long time

Although electrochemical methods can obtain electrochemical information, most of them are limited to studying a single area separately, and it is difficult to obtain corrosion information such as real-time current when galvanic corrosion occurs, and it is also impossible to realize online nondestructive testing.

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