Kinetics and structural studies of the atmospheric corrosion of carbon steels in Panama |
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| Authors: | Juan A Jaén Mariela Sánchez de Villalaz Lilibeth de Araque Agnes de Bósquez |
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| Institution: | (1) Centro de Investigaciones con Técnicas Nucleares, Universidad de Panamá, Panama;(2) Laboratorio de Metalurgia, Universidad Tecnológica de Panamá, Panama;(3) Departamento de Química, Universidad de Panamá, Panama |
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| Abstract: | The corrosion of a carbon steel was studied in different atmospheres at sites in the Republic of Panama. The weight loss (corrosion penetration) suffered by the carbon steel is related to time by a bilogarithmic law. Mössbauer spectroscopy indicated the rust was composed of non-stoichiometric magnetite (Fe3-xO4), maghemite (γ-Fe2O3), goethite (α-FeOOH) of intermediate particle size, lepidocrocite (γ-FeOOH) and superparamagnetic particles. Magnetite formation is related to the alternating dry--wet cycles. Goethite is related to corrosion penetration by a saturation type of behavior, following a Langmuir type of relationship. Goethite in rust protects steel against further atmospheric corrosion. |
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