2012
DOI: 10.4236/msa.2012.36049
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Evaluation of Corrosion Stability of Water Soluble Epoxy-Ester Primer through Electrochemical Studies

Abstract: The corrosion behavior of water borne epoxy-ester primer coatings (10% - 50% PVCs) was evaluated through electrochemical techniques such as polarization and impedance spectroscopic (EIS) measurements. Studies were carried out for a longer duration of exposure extending up to 60 days in aqueous solution of NaCl (5%). Corrosion current (i<sub>corr</sub>), Corrosion potential (E<sub>corr</sub>), Coating resistance (R<sub>c</sub>), Charge transfer resistance (R<sub>ct</… Show more

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Cited by 5 publications
(3 citation statements)
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“…D., & Vasudevan. T., [13], the increasing of Rp value indicates that epoxy coating have higher resistance towards corrosion, coating adherence and there was formation of more protective film on steel. The higher the corrosion potential will shifted the graph towards positive directions, and the lower corrosion current will make the corrosion rate to be increased as well as polarization resistance.…”
Section: Resultsmentioning
confidence: 93%
“…D., & Vasudevan. T., [13], the increasing of Rp value indicates that epoxy coating have higher resistance towards corrosion, coating adherence and there was formation of more protective film on steel. The higher the corrosion potential will shifted the graph towards positive directions, and the lower corrosion current will make the corrosion rate to be increased as well as polarization resistance.…”
Section: Resultsmentioning
confidence: 93%
“…6c). The charge transfer resistance parameter (Rct), a measure of the resistance to the electron transfer across the metal surface32, is normally used to quantify the disbanding of the coatings and the onset of corrosion at the interface33. The higher value of Rct for EP/TNT/Imeso during the initial immersion period (0 h) shows that it is more difficult for the corrosion reaction to occur.…”
Section: Resultsmentioning
confidence: 99%
“…The performance of the coated samples was also evaluated using different procedures of analysis of conventional EIS measurements with the immersion time. One of them was based on the breakpoint frequency concept [38] and applied to evaluate different coatings [35,39,40]. The breakpoint frequency f b is the frequency at which the phase angle firstly falls to 45 • and can show a good correlation between f b and the delaminated area of the coating from the metal substrate [38].…”
Section: Thickness Of Coatings Coatings Porosity and Performancementioning
confidence: 99%