Capacitive Tran sducer f or Pitting Corrosio n Monit oring of Carbon St eel

Corrosion of pipelines and storage facilities is a significant problem for the oil and gas industr y. The mos t destructive form of corrosion is localized pitting (LP) corrosion, in which the m etal or alloy is perforated ra pidly. A preliminary evaluation indicated that electroc hemical no ise analysis (ENA) co uld be an e ffective m ethod to an alyze LP co rrosion. ENA is a nondestructive, in-situ metho d of monit oring natural corrosio n processes [۱]. To characterize the c orrosion me chanism, Argonne used different signal pro cessing alg orithms to inte rpret the ENA data. Powerful s ignal processing tech nique that could be used to characterize the n oise data in a frequency domain. The slope of the pow er spectral density (PSD) versus freq uency of the transformed signa l is believed to relate to the corrosion mechan ism. Coupling the PSD analysis technique with ENA would be an important step in develop ing a practical tool for monitorin g LP for in dustrial applications. Therefore, the low-frequency portion of the potential noise PSD could be us ed to char acterize the pitting corrosi on process. Inspecting a much l ower frequ ency range of the p otential noise PSD spectrum (e.g., be yond ۱۰-۳ Hz) may be necessary to diffe rentiate do minating LP from uniform ly distribu ted pitting [۱-۳].

کلیدواژه ها:

localized pitting ، corrosion monitoring ، capacitive transducer ، carbon ste el.