In-Situ Monitoring and Analysis of the Pitting Corrosion of Carbon Steel by Acoustic Emission

Applied Sciences

Geng Chen¹  Junlei Tang²  Yingying Wang²  Junyang Li³  Hu Wang³ 

[1] CNOOC Energy Technology &School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China;School of Material Science and Engineering, Southwest Petroleum University, Chengdu 610500, China;

关键词: carbon steel;    pitting corrosion;    acoustic emission;    wavelets;    pattern recognition;   

DOI  :  10.3390/app9040706

来源: DOAJ

【 摘 要 】

The acoustic emission (AE) technique was applied to monitor the pitting corrosion of carbon steel in NaHCO₃ + NaCl solutions. The open circuit potential (OCP) measurement and corrosion morphology in-situ capturing using an optical microscope were conducted during AE monitoring. The corrosion micromorphology was characterized with a scanning electron microscope (SEM). The propagation behavior and AE features of natural pitting on carbon steel were investigated. After completion of the signal processing, including pre-treatment, shape preserving interpolation, and denoising, for raw AE waveforms, three types of AE signals were classified in the correlation diagrams of the new waveform parameters. Finally, a 2D pattern recognition method was established to calculate the similarity of different continuous AE graphics, which is quite effective to distinguish the localized corrosion from uniform corrosion.

【 授权许可】

Unknown