Application of acoustic emission to predict corrosion.
Droubi, M. Ghazi
Faisal, Nadimul Haque
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DROUBI, M.G. and FAISAL, N.H. 2017. Application of acoustic emission to predict corrosion. In the Proceedings of the 14th International Slovenian Society for Non-Destructive Testing conference: application of contemporary non-destructive testing in engineering, 4-6 September 2017, Bernardin, Slovenia. Bad Breisig, Germany: NDT.net [online], pages 271-278. Available from: http://www.ndt.net/?id=22578
Non-destructive testing (NDT) techniques used for petroleum pipelines and offshore windturbines can only detect corrosion after it has occurred. Therefore, intrusive inspections are required regularly, potentially causing disruption to operation and production. Acoustic Emission (AE) is a non-destructive testing (NDT) sensor based technique which measures the detection and the conversion of high frequency (between 100 kHz to 1 MHz) elastic waves generated by the rapid release of energy to electrical signals. AE is released when crack propagates in the specimens during corrosion. This presentation will summarise AE sensor based technique for monitoring corrosion and offer examples of practical applications. Samples tested include aluminium and steel thin plates (rectangular shape) in different corrosive environments. AE from corrosion usually releases much less energy than emission from crack growth, and so is more difficult to detect in the field environment. However, the results present an exponential curve showing a trend between the concentration of the corrosive environment and the energy of the acoustic emission signal.