Development of an electrochemistry-based corrosion sensor to monitor corrosion of boiler tubes, pipes, and painted structures

Guy D. Davis; C. M. Dacres; M. B. Shook

doi:10.1117/12.302514

15 March 1998 Development of an electrochemistry-based corrosion sensor to monitor corrosion of boiler tubes, pipes, and painted structures

Guy D. Davis, C. M. Dacres, M. B. Shook

Author Affiliations +

Proceedings Volume 3398, Nondestructive Evaluation of Utilities and Pipelines II; (1998) https://doi.org/10.1117/12.302514
Event: Non-Destructive Evaluation Techniques for Aging Infrastructure and Manufacturing, 1998, San Antonio, TX, United States

Abstract

An electrochemical impedance spectroscopy (EIS)-based in-situ corrosion sensor has been adapted and evaluated for use with steel heat exchanger tubes in boilers, coated buried steel pipes, and painted steel structures. An excellent correlation was obtained between the algorithm of the ratio of the breakpoint frequencies, as measured by the sensor, and corrosion rate for the boiler tubes. Use of this sensor and appropriate electronics would allow the corrosion of the boiler tubes to be monitored in real time and the inhibitor concentration automatically controlled to prevent excessive corrosion. The EIS sensor is also sensitive to the quality of coating of a buried steel pipe with and without the application of cathodic protection. Similar results were obtained from a sensor attached to the pipe and from a separate electrode driven into the soil. A hand-held version of the EIS in-situ sensor is suitable for inspecting painted metal structures, such as storage tanks and locks and dams, under ambient, service conditions. An excellent correlation was obtained between the sensor measurements, and the amount of corrosion on test panels immersed for up to 28 years.

Citation Download Citation

Guy D. Davis, C. M. Dacres, and M. B. Shook "Development of an electrochemistry-based corrosion sensor to monitor corrosion of boiler tubes, pipes, and painted structures", Proc. SPIE 3398, Nondestructive Evaluation of Utilities and Pipelines II, (15 March 1998); https://doi.org/10.1117/12.302514

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