Evaluation of Epoxy Coating for Ballast Tanks under Thermal Cycling by Electrochemical Impedance Spectroscopy

Hayashibara, Hitoshi; Tada, Eiji; Nishikata, Atsushi

doi:10.2355/isijinternational.isijint-2016-228

Cited by 6 publications

(4 citation statements)

References 17 publications

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“…More degree of freedom will be required since the spectra were obtained wide frequency range like 1 kHz-1 mHz. As previously reported 3) , the EIS spectra of the thick-coated steel at an early stage of degradation can be represented by a multi-time constant circuit, as shown in Fig. 3(a).…”

Section: Adhesion Testmentioning

confidence: 62%

“…However, it might be dif cult to measure R f even after the onset of coating degradation and underlying steel corrosion, particularly for thick coatings (heavy-duty coatings). In our previous study on a 200-μm-thick epoxy coating 3) , the coating capacitance (C f ) clearly changed due to the increase of water uptake in coatings in the degradation process. This is because the dielectric constant of water (≈80) is considerably larger than that of the dry coating (usually <10).…”

Section: Introductionmentioning

confidence: 89%

“…The tting was attempted by the equivalent circuits of two to eight series combinations of R f /CPE f , where it was assumed that CPE f was constant and only R f was distributed. This is because R f more signi cantly changes with water uptake and temperature 3) than CPE f . The EIS spectra were found to be well tted by ve or more series combinations.…”

Section: Electrochemical Impedance Spectroscopy Of Coated Steelmentioning

confidence: 99%

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Monitoring the Early Stage of Degradation of Epoxy-Coated Steel for Ballast Tank by Electrochemical Impedance Spectroscopy

2017

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The early stages of the degradation of thick epoxy-coated steels used for water ballast tanks were monitored by electrochemical impedance spectroscopy (EIS). 200-μm-thick epoxy-coated steels were exposed to accelerated corrosion tests containing humid air at 70 C for 246 days before immersion in a NaCl solution at 70 C for 79 days. They were removed from the corrosion test chamber during the test so that EIS measurements could be performed in order to determine the coating resistance (R f) and the coating capacitance (C f). In addition, the water volume fraction (X V) and the diffusion coef cient (D H2O) in the coating were determined from the C f vs. t 1/2 curves during the water desorption process. These parameters were compared with the degradation morphology of the coated steel after a pull-off test. Only physical aging of coating was observed for rst 80 days. After 190 th day, R f decreasing, C f and X V increasing started. Underlying corrosion also initiated between 80 th and 190 th day. On the other hand D H2O did not indicate the clear change associated with the degradation. The changes in R f , C f , and X V were closely correlated with the progress of the degradation of the coated steels.

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Section: Adhesion Testmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 89%

Section: Electrochemical Impedance Spectroscopy Of Coated Steelmentioning

confidence: 99%

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Monitoring the Early Stage of Degradation of Epoxy-Coated Steel for Ballast Tank by Electrochemical Impedance Spectroscopy

2017

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“…Electrochemical impedance spectroscopy (EIS) is another powerful method to monitor the corrosion of metallic materials in various environments [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] because of its ability to estimate instantaneous CRs. This method offers the advantage of allowing bulk materials to be used as working electrodes (corrosion monitoring sensors).…”

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confidence: 99%

In Situ Evaluation of Carbon Steel Corrosion under Salt Spray Test by Electrochemical Impedance Spectroscopy

Ito

Ooi

Tada

et al. 2020

J. Electrochem. Soc.

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Electrochemical Impedance Spectroscopy was utilized to investigate the corrosion behavior of carbon steel in a salt spray test (SST) chamber. The salt spray was applied using 5% NaCl solution at 35 °C. A two-electrode cell comprising a pair of identical carbon steel electrodes embedded in epoxy resin were placed at six different angles (0°, 30°, 45°, 60°, 75°, and 90°) to the horizontal in the chamber. The corrosion rate (CR) of the carbon steel samples and the thickness of the solution film formed on the sample surface were evaluated from the impedances at low and high frequencies, respectively. The CR of carbon steel fixed horizontally (0°) exhibited a low value compared with that fixed at other angles. When the angle changed from 30 to 75°, the solution film thickness decreased greatly, but there was no significant difference in the CR. The CR of carbon steel under the employed SST conditions was more than five times higher than that in a bulk 5% NaCl solution under natural convection. The corrosion mechanism of carbon steel in the SST chamber is also discussed.

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Effects of Immersion Temperature on the Performance of a Marine Epoxy-Based Organic Coating for Ballast Tanks

Yang

Zhang

et al. 2021

J. of Materi Eng and Perform

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Evaluation of Epoxy Coating for Ballast Tanks under Thermal Cycling by Electrochemical Impedance Spectroscopy

Cited by 6 publications

References 17 publications

Monitoring the Early Stage of Degradation of Epoxy-Coated Steel for Ballast Tank by Electrochemical Impedance Spectroscopy

Monitoring the Early Stage of Degradation of Epoxy-Coated Steel for Ballast Tank by Electrochemical Impedance Spectroscopy

In Situ Evaluation of Carbon Steel Corrosion under Salt Spray Test by Electrochemical Impedance Spectroscopy

Effects of Immersion Temperature on the Performance of a Marine Epoxy-Based Organic Coating for Ballast Tanks

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