Effects of wave propagation paths and system calibration on uniform corrosion monitoring using acoustic emission
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Author list: Noipitak M., Prateepasen A.
Publication year: 2011
Volume number: 67
Issue number: 11
ISSN: 0010-9312
eISSN: 0010-9312
Languages: English-Great Britain (EN-GB)
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Abstract
Acoustic emission (AE) can be used to monitor damage such as fracture and corrosion in situ. For AE from individual signal bursts produced by the corrosion process, the intensity of the AE energy and HIT (hit count) may be used potentially to grade the severity of the corrosion level. However, different conditions, such as the size of the tank, the type of AE sensor, or the liquid medium, may cause different levels of AE signals even when obtained from the identical corrosion source. This problem makes the quantitative understanding of corrosion damage using AE difficult. In this paper, the effects of the AE wave propagation paths, including the liquid medium, the AE sensor, the connection cable, and the amplified signals, on the AE signal received from a uniform corrosion process on carbon steel, are investigated and modeled with theoretical and empirical equations. In addition, to verify our proposed model for various types of AE sensors, the air jet implemented is demonstrated to convert AE energy from different AE sensors. Finally, an equation is proposed to estimate the AE energy for different wave propagation paths. Experimental tests were performed to validate the proposed equation. The error of prediction of the uniform corrosion energy is less than 5%. The novelty of this paper was to forecast the grade of the severity of uniform corrosion quantitatively when using various AE monitoring conditions. ฉ 2011, NACE International.
Keywords
Potentiostat, Uniform corrosion, Wave propagation path
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