A Corrosion Sensor for Monitoring the Early-Stage Environmental Corrosion of A36 Carbon Steel
Abstract
:1. Introduction
2. Results and Discussion
2.1. Iron Loss during Corrosion
2.2. Compositions of the Rust
Materials | α-Fe2O3 | γ-FeOOH | Fe3O4 | α-FeOOH | Amorphous Fe2O3 | Iron | Air |
---|---|---|---|---|---|---|---|
Electrical resistivity ρ (Ω·m) | (1.58–5.62) × 104 [25] | (0.20–0.80) × 105 [26] | 1.58 × 10−4 − 0.1 [27] | (1.30–2.33) × 105 [26] | 2.12 × 103 [28] | 1.0 × 10−7 | 4 × 1013 |
Dielectric constant ε | 12 | 2.6 [29] | 20 | 11 [30] | 4.5 | – | 1 |
2.3. Electrical Resistance of the Sensor
2.4. Capacitance of the Sensor
3. Experimental Procedures
3.1. Cylindrical Capacitor
3.2. Corrosion Test
3.3. Sensor Measurements
3.4. Sample Analyses
4. Conclusions
Supplementary Files
Supplementary File 1Acknowledgments
Author Contributions
Nomenclature
a | radius of the A36 steel rod (m) |
b | inner radius of the 316 stainless steel ring (m) |
C | sensor’s capacitance (pF) |
h | height of the cylinder sensor (m) |
R | electrical resistance of a material (Ω) |
ε0 | free space permittivity, 8.85 pF/m |
ε1 | equivalent dielectric constant of the porous iron rust on the A36 steel rod surface |
ε2 | dielectric constant of the air gap between the iron rust on the A36 steel rod surface and the 316 stainless steel ring |
ρ1 | equivalent electrical resistivity of the porous iron rust on the A36 steel rod surface (Ω·m) |
ρ2 | electrical resistivity of the air gap between the iron rust on the A36 steel rod surface and the 316 stainless steel ring (Ω·m) |
δ | average thickness of the iron rust on the A36 steel rod surface (m) |
φ | average porosity of the iron rust on the A36 steel rod surface |
Conflicts of Interest
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Chen, D.; Yen, M.; Lin, P.; Groff, S.; Lampo, R.; McInerney, M.; Ryan, J. A Corrosion Sensor for Monitoring the Early-Stage Environmental Corrosion of A36 Carbon Steel. Materials 2014, 7, 5746-5760. https://doi.org/10.3390/ma7085746
Chen D, Yen M, Lin P, Groff S, Lampo R, McInerney M, Ryan J. A Corrosion Sensor for Monitoring the Early-Stage Environmental Corrosion of A36 Carbon Steel. Materials. 2014; 7(8):5746-5760. https://doi.org/10.3390/ma7085746
Chicago/Turabian StyleChen, Dong, Max Yen, Paul Lin, Steve Groff, Richard Lampo, Michael McInerney, and Jeffrey Ryan. 2014. "A Corrosion Sensor for Monitoring the Early-Stage Environmental Corrosion of A36 Carbon Steel" Materials 7, no. 8: 5746-5760. https://doi.org/10.3390/ma7085746