Thermal analysis of corrosion products formed on carbon steel in ammonium chloride solution |
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Authors: | Bogdan Tutunaru Adriana Samide Catalin Negrila |
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Affiliation: | 1. Department of Chemistry, Faculty of Sciences, University of Craiova, 107i Calea Bucure?ti, Craiova, Romania 2. National Institute of Materials Physics, Magurele, 077125, Bucharest, Romania
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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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