51314-4400-Correlation Analysis of Different Corrosion Rates with Acoustic Emission Activity of a Carbon Steel

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Product Number: 51314-4400-SG

ISBN: 4400 2014 CP

Author: Miguel Gonzalez Nunez

Publication Date: 2014

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The use of acoustic emission (AE) technique for the detection and location of corrosion damages in metallic structures is well known systematic tests have been conducted in the laboratory and in the field. The AE method can be used for on-line monitoring to periodically detect corrosion growth during the active corrosion stage or off-line for detection of active corrosion at a specific time. AE signals from the corrosion process on carbon steel are combined high and low frequency signals related to the breakdown and spalling of the oxide film formed during the corrosion process. Despite the amplitudes of the corrosion process are low in amplitude compared to other damaging emission mechanisms such as crack growth they still may be detected depending on the background noise conditions. AE corrosion signals under particular conditions can be of similar amplitudes or much higher than background noise.In the present work different corrosion rates of a carbon steel plate in a 3.5% NaCl solution were studied under controlled conditions. A combination of Potentiostatic and Polarization Resistance experiments were carried out simultaneously with AE measurements to observe and analyze the change in corrosion rate compared to a hit rate calculated from both electrochemical and AE tests. Characteristic AE signal features were recorded and analyzed at the different corrosion rates using potentiostatic meausrements. Preliminary results show some degree of correlation between the different corrosion rates associated with different AE hit rate activity taking place during the corrosion process.