Thermal Cycling of Epoxy Coatings Using Room Temperature Ionic Liquids

Hinderliter, Brian; Allahar, Kerry N.; Bierwagen, Gordon P.; Tallman, Dennis E.; Croll, Stuart

doi:10.1149/1.2822991

Cited by 19 publications

(18 citation statements)

References 16 publications

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“…All parameters obtained are tabulated in Table 2. The obtained D H2O was close to that obtained for epoxy resin (0.1-9 × 10 −9 cm 2 s −1 ), as reported by the gravimetric 12,13,21) and EIS 7,8,[10][11][12][13] methods.…”

Section: Water Uptake and Diffusion Coef Cientsupporting

confidence: 89%

“…The diffusion coef cient of water (D H2O ) was estimated by EIS [7][8][9][10][11][12][13] . There are a few studies [9][10][11] on the relation between D H2O and the coating degradation. It was reported that the coating degradation due to UV irradiation increased D H2O by approximately 2.5 times 9) .…”

Section: Introductionmentioning

confidence: 99%

“…The change in D H2O may depend on the degradation process. Only Hinderliter et al 11) have examined epoxy-coated Al alloys in the thermal cycling from room temperature (RT) up to 70 C for approximately 40 days.…”

Section: Introductionmentioning

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: Water Uptake and Diffusion Coef Cientsupporting

confidence: 89%

Section: Introductionmentioning

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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“…21 We are currently trying to expand our quantitative understanding of degradation accelerating factors in other studies from this laboratory. 22,23 …”

Section: Discussionmentioning

confidence: 99%

A new acceleration factor for the testing of corrosion protective coatings: flow-induced coating degradation

Wang

Bierwagen

2009

J Coat Technol Res

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For corrosion protective coatings that are designed to give lifetimes of protection that may extend to 50 years, valid accelerated test methods are necessary to develop improved systems and validate performance. Fluid flow over metals has long been believed to influence the corrosion process. Studies have been focused on the effects of flow rate on the corrosion of bare metals. The influence of fluid flow on the degradation of metal-protective coatings has received less attention. This paper describes a preliminary study on the influence of laminar flow on organic coatings. A Hele-Shaw cell and its associated fluid control apparatuses are incorporated into the electrochemical cell setup. The barrier properties of the coating as a function of immersion time and flow rate have been monitored by electrochemical impedance spectroscopy. We observe that the barrier properties of the coating measured electrochemically decrease exponentially with the increasing flow rate. We propose that the flowing electrolyte solution could be used in acceleration tests for the lifetime prediction of organic coatings as the acceleration of failure we have observed does not appear to change the mechanism of failure. Further analysis is proposed to validate immersion flow rate as a universal accelerating parameter for coating failure.

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“…Thermal cycling tests 3,7,8,[10][11][12] that simulated the WBT environments were conducted to evaluate the coating performance. In the PSPC-approved test, 3) coated test samples are exposed to two different conditions: (1) alternate high humidity conditions at 50 and 20°C with sea water splashes that simulate the back side of the upper deck (wave tank test) and (2) dry conditions at 70°C that simulate the region between the heated fuel oil tank and the double bottom.…”

Section: Thermal Cycle Testmentioning

confidence: 99%

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

2016

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Thermal Cycling of Epoxy Coatings Using Room Temperature Ionic Liquids

Cited by 19 publications

References 16 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

A new acceleration factor for the testing of corrosion protective coatings: flow-induced coating degradation

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

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