In-Situ Corrosion Monitoring of Scratched Epoxy Coated Carbon Steel in Saturated CaOH2 with or without 3% NaCl by Scanning Electrochemical Microscopy and Electrochemical Impedance SpectroscopyReportar como inadecuado




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The present work isinvestigated the in-situ monitoringof local corrosion process of scratched epoxy coated carbon steel in saturatedCaOH2 with and without 3% NaCl using SECM and correlated with EIS.The results obtained from EIS analysis showed that the corrosion resistance ofscratched epoxy coated carbon steel decreases in Cl- containingsolution as the increase in wet- dry corrosion cycles. This was indicated bydecrease in film resistance Rfand charge transfer resistance Rct,while the coated steel maintain the resistance values in saturated CaOH2,most of which recovered after drying. The corrosion process was monitored usingSECM by setting the tip potential at -0.70 V vs Ag-AgCl, where the consumptionof dissolved oxygen occurred at the surface of test sample. The consumption ofdissolved oxygen current I’oxy-cvalues was increased during the immersion in a solution with 3% NaCl. However,in wet-dry corrosion cycles, I’oxy-c was decreased due to the coverage of hydroxides-oxides at scratch area whichsuppressed the consumption of dissolved O2. It was found that thecontinuous decrease in corrosion was mainly attributed to continuous formationof corrosion products at anodic spots.

KEYWORDS

Epoxy Coated Carbon Steel, Alkaline Solution, Chlorides, SECM, Wet-Dry Corrosion Cycles

Cite this paper

Balusamy, T. and Nishimura, T. 2016 In-Situ Corrosion Monitoring of Scratched Epoxy Coated Carbon Steel in Saturated CaOH2 with or without 3% NaCl by Scanning Electrochemical Microscopy and Electrochemical Impedance Spectroscopy. American Journal of Analytical Chemistry, 7, 533-547. doi: 10.4236-ajac.2016.77049.





Autor: Thangaraj Balusamy, Toshiyasu Nishimura*

Fuente: http://www.scirp.org/



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