Abstract
The anodic dissolution of carbon steel in ammonium chloride (NH4Cl) solutions (5, 10, and 20 wt%) is investigated via various electrochemical techniques and other complementary techniques. The polarization measurements reveals that the carbon steel is susceptible to general corrosion. The impedance data taken at various overpotentials shows multiple loops, corresponding to capacitance, inductance, and negative capacitance, and the number of time constants observed is also not the same for various NH4Cl concentrations. From reaction mechanism analysis, a multi-step reaction mechanism with three adsorbed intermediates and three dissolution paths (one chemical path and two electrochemical paths) is proposed to describe the observed patterns in impedance measurements. The surface coverage of intermediate species and the contribution of chemical reaction and electrochemical reaction to the overall corrosion rate are also estimated from the proposed model. The results obtained from field emission scanning electron microscopy and Raman spectroscopy measurements are also reported.
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Acknowledgements
This work was supported by DST-SERB, India (SERB/F/1365/2014-15). We acknowledge Central Instruments Facility of Indian Institute of Technology, Guwahati, India for providing facility for FESEM and Raman spectroscopy analysis.
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Baranwal, P.K., Prasanna Venkatesh, R. Investigation of carbon steel anodic dissolution in ammonium chloride solutions using electrochemical impedance spectroscopy. J Solid State Electrochem 21, 1373–1384 (2017). https://doi.org/10.1007/s10008-016-3497-8
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DOI: https://doi.org/10.1007/s10008-016-3497-8