This research aims to study the solubility of a protective iron carbonate (FeCO3) layer in the presence of acetic acid using an electrochemical quartz crystal microbalance (EQCM). Several sets of experiments were conducted in situ to quantitatively evaluate the solubility of an FeCO3 layer in the presence of acetic acid. The first set of experiments was designed to determine the influence of the pH on FeCO3 precipitation in the absence of acetic acid. The second set of experiments to study the solubility of the FeCO3 layer was conducted with three different undissociated acetic acid concentrations (1mM, 3mM, and 5mM) at pH 6.0 and 80°C. The acetic acid was added into the system as a buffered solution for each test so no change in pH occurred. After each test, the corrosion product film was characterized by SEM, EDX/EDS, Raman spectroscopy, XPS, and TEM surface analysis techniques. From both series of tests, it was proven that the presence of acetic acid partially removed the FeCO3 layer by selective dissolution.

Subject
Energy dispersive X-ray spectroscopy, Precipitation (solids), Substrates, Sodium chloride, Dissolution, Solubility, Quartz, X-ray spectroscopy, Platinum, Acidity, Sodium chloride solution, Experimental data, Acetic acid
Keywords:
platinum coated quartz crystal, iron carbonate, acetic acid, EQCM, SEM, EDS, FIB/TEM/ED, diffraction, XPS
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2013
Association for Materials Protection and Performance (AMPP)
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