Monitoring and detection of corrosion defect in the inner wall of the metal tube by non-destructive electromechanical impedance method

Document Type : Original Article

Authors

1 Assistant Professor, Mechanical Engineering Department, Shahid Rajaee Teacher Training University, Tehran, Iran

2 Mechanical Engineering Department, Tarbiat Modares University, Tehran, Iran

3 Manufacturing Engineering PhD student of Shahid Rajaee University

Abstract

Corrosion is a type of irreversible destruction of a metal by chemical or electrochemical reaction with ambient. The loss of materials caused by corrosion in metallic structures is a widespread and urgent problem in various industries including petroleum, gas, aerospace, construction, mining, and manufacturing. Pipes used in the oil and gas industry as well as aluminum pipes used for heat transfer in cooling systems are subject to corrosion. Therefore, the evaluation and detection of corrosion, progressive damage, is of particular importance both qualitatively and quantitatively. In this study, a new electromechanical impedance measurement method was used to detect corrosion inside an aluminum tube. Defects or changes in the structure integrity cause changes in the mechanical impedance of the structure which shown as the alteration in the piezoelectric electrical impedance, due to the piezoelectric coupling characteristics. For this study, a circular corrosion cross-section with insulation of the surrounding environment on the inner wall of the tube was created by the corrosive acid solution in a period of 180 minutes until the tube was pierced. Measurement of impedance spectrum in the range of 10-20 kHz was performed to monitor changes in impedance shape as a result of corrosion progress in steps of 20 minutes. Comparing the impedance spectrum at each step with healthy state, changes in amplitude and resonance frequencies revealed and extracted quantitatively. Experimental results from the scalar damage criteria increased linearly with increasing corrosion depth, indicating the effectiveness of this method in real-time detection of corrosion damage in the pipe.

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Iranian Journal of Manufacturing Engineering
Volume 7, Issue 6
August 2020
Pages 8-17

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