Monitoring Passive Film Growth on Steel using Fe-C Coated Long Period Grating Fiber Sensor
Fe-C coating is electroplated on the surface of a long period grating (LPG) optical fiber, and the growth of passive film on its surface is monitored through the change of transmitted spectrum. The test is performed in saturated calcium hydroxide solution for 50 h, during which the passivation of the Fe-C coating is monitored with electrochemical impedance spectroscopy, and the change of the transmission spectrum of Fe-C coated LPG fiber is recorded with an optical spectrum analyzer (OSA). Results indicate that an increase is observed in open-circuit potential (OPC), passive film resistance, and transmission intensity while a decrease is present in passive film capacitance and resonant wavelength, all of which are associated with the growth of passive film. This Fe-C coated LPG optical sensor can be used to monitor the growth of passive film on steel in aqueous environment with varying sensitivity from 0.04 to 0.12 nm thickness increase corresponding to 1.0 nm decrease in the resonant wavelength.
F. Tang et al., "Monitoring Passive Film Growth on Steel using Fe-C Coated Long Period Grating Fiber Sensor," IEEE Sensors Journal, vol. 19, no. 16, pp. 6748-6755, Institute of Electrical and Electronics Engineers Inc., Aug 2019.
The definitive version is available at https://doi.org/10.1109/JSEN.2019.2914029
Electrical and Computer Engineering
Materials Science and Engineering
Intelligent Systems Center
Keywords and Phrases
Deposition; Electrochemical Impedance Spectroscopy; Fiber Optics; Long-Period Grating Fiber; Passivation
International Standard Serial Number (ISSN)
Article - Journal
© 2019 Institute of Electrical and Electronics Engineers Inc., All rights reserved.
01 Aug 2019