Online acoustic emission-electrochemical combined experimental device for stress corrosion of tank bottom plate

Abstract

The invention discloses an online acoustic emission-electrochemical combined experimental device for stress corrosion of a tank bottom plate. The device comprises a hydraulic loading device, a load sensor, a loading knife, a three-point bending device, an acoustic emission sensor, a metal test piece, an etching solution, an organic glass electrolytic tank, a cushioning rubber pad, a guard sensor and a three-electrode system. The load sensor is arranged below the hydraulic loading device to measure a load loaded to the metal test piece. The test piece is arranged on the three-point bending support and keeps constant deformation under the load effect. The three-electrode system is connected to an electrochemical workstation to provide a constant potential for polarization. The sensor is fixed at the back of the test piece by a matching magnetic clamp in a good coupling manner and is connected with an acoustic emission meter AMSY-5 so as to monitor a stress corrosion acoustic emission signal from the test piece in real time. The online acoustic emission-electrochemical combined experimental device can be applied to on-line detection of the stress corrosion of the metal test piece under a constant load and electrochemical corrosion parameters and acoustic emission corrosion signals are collected synchronously. Moreover, the device is convenient to mount, dismount and clean and canbe used repeatedly.

Description

Technical field [0001] The invention relates to the technical field of experimental equipment, in particular to an online acoustic emission-electrochemical joint experiment device for stress corrosion of tank bottom plates. Background technique [0002] In addition to the basic form of large-area uniform corrosion and local pitting corrosion, the corrosion of the bottom plate of atmospheric storage tanks is usually due to various stresses, such as working stress caused by local external loads, weld residual stress, temperature stress, and corrosion product layers. Stress, etc., combined with the corrosive medium, stress corrosion also occurs in special parts, such as the large fillet welds between the bottom ring tank wall plate and the tank bottom edge plate, the middle width plate weld, and the contact position between the floating roof column and the tank bottom plate Wait. The joint effect of stress and corrosive media is not a simple superposition, but a process of mutual p...

AI Technical Summary

Problems solved by technology

[0003] Usually the surface of the material is slightly damaged, but some tiny cracks have penetrated into the interior of the material, but such fine cracks are difficult to detect by conventional methods, and their destructiveness is difficult to predict, often in the case of little overall corrosion of the overall material Unforeseen sudden cracking

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