Steel Bar Corrosion Monitoring with Long-Period Fiber Grating Sensors Coated with Nano Iron/Silica Particles and Polyurethane
In this article, a recently proposed long-period fiber grating sensor coated with a thin layer of polyurethane and nano iron/silica particles is further developed and applied to monitor the corrosion process of deformed steel bars. Once calibrated, one coated long-period fiber grating sensor and one uncoated long-period fiber grating sensor for environmental compensation were attached to each of three steel bar samples that were tested in 3.5 wt% NaCl solution for 512 h. The resonant wavelength in long-period fiber grating spectra increased exponentially with immersion time due to corrosion of iron particles and thus reduction in coating thickness. The mass loss rate of steel bar #1 at the completion of corrosion tests (512 h of corrosion time) was correlated with that of sparse iron particles on long-period fiber grating sensor #1 after 130.5 h of immersion. The corrosion rates of long-period fiber grating sensors #2 and #3 were evaluated at 130.5 h and then used as a prediction of the corrosion rates of steel bars #2 and #3. The predicted corrosion rates by the long-period fiber grating sensors #2 and #3 were finally compared with those by potentiodynamic tests. The maximum mass loss prediction error by the long-period fiber grating sensors #2 and #3 is 26%. The coefficients of variation of three corrosion rate measurements are 0.049 by the long-period fiber grating sensors and 0.115 by the potentiodynamic tests, indicating more consistent and reliable measurements with the proposed technology.
Y. Huang et al., "Steel Bar Corrosion Monitoring with Long-Period Fiber Grating Sensors Coated with Nano Iron/Silica Particles and Polyurethane," Structural Health Monitoring, vol. 14, no. 2, pp. 178-189, SAGE Publications Ltd, Mar 2015.
The definitive version is available at http://dx.doi.org/10.1177/1475921714560070
Civil, Architectural and Environmental Engineering
Electrical and Computer Engineering
Keywords and Phrases
Long-Period Fiber Gratings; Nano Iron Particles; Polyurethane; Steel Corrosion; Bars (Metal); Diffraction Gratings; Fibers; Nanosensors; Steel Fibers; Thickness Measurement; 3.5 Wt% NaCl Solution; Coefficients Of Variations; Corrosion Rate Measurements; Environmental Compensation; Long Period Fiber Grating; Nanoiron; Potentiodynamic Tests; Resonant Wavelengths
International Standard Serial Number (ISSN)
Article - Journal
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