Abstract
The influence of different ions NO3 − and SO4 2− on the carbon steel corrosion in ammonium chloride was investigated using mass loss measurements and potentiodynamic polarization. Corrosion products were analyzed using X-ray photoelectron spectroscopy (XPS) and simultaneous thermal and differential scanning calorimetry (TG/DSC). XPS analysis shows that the main product of corrosion is a non-stoichiometric Fe3+ oxyhydroxide, consisting of a mixture of FeO(OH) and FeO(OH) containing inclusions of these anions, species such as Fe3+O(OH,Cl−); Fe3+O(OH,SO4 2−); and Fe3+O(OH,NO3 −). TG/DSC confirms the decomposition of the rusty products formed by chemical corrosion, compounds like Fe3+ oxyhydroxides, with β-FeOOH as the major phase, crystal structure of which may contain Cl−, NO3 −, and SO4 2−—e.g., akaganeite [Fe3+O(OH,A)].
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This study was supported by CNCSIS—UEFISCSU, under project number PNII—IDEI 422/2008.
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Tutunaru, B., Samide, A. & Negrila, C. Thermal analysis of corrosion products formed on carbon steel in ammonium chloride solution. J Therm Anal Calorim 111, 1149–1154 (2013). https://doi.org/10.1007/s10973-011-2187-0
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DOI: https://doi.org/10.1007/s10973-011-2187-0