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Investigations of corrosion films formed on API-X52 pipeline steel in acid sour media |
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| Authors: | A. Herná ndez-Espejel,R. Cabrera-Sierra,E.M. Arce-Estrada |
| Affiliation: | a Instituto Politécnico Nacional, Departamento de Ingeniería Metalúrgica, IPN-ESIQIE, UPALM Ed. 7, Zacatenco 07738, México, D.F., Mexico b Instituto Politécnico Nacional, CICATA-Unidad Altamira-Tamaulipas, km 14.5, Carretera Tampico-Puerto Industrial Altamira, 89600 Altamira, Tamps, Mexico c Instituto Politécnico Nacional, Departamento de Ingeniería Química Industrial, IPN-ESIQIE, UPALM Ed. 7, Zacatenco 07738, México, D.F., Mexico |
| Abstract: | Corrosion films formed by voltammetry using different switching potentials and by immersion on API-X52 pipeline steel in simulated acid sour media (NACE ID182) have been characterized using Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), Linear Polarization and Electrochemical Impedance Spectroscopy (EIS) techniques. XRD and EDS analysis showed that the films are mainly composed of sulphide compounds (mackinawite, troilite, marcasite and pyrite) as well as iron oxides, as steel damage increases. Across SEM micrographs the corrosion films formed by potentiodynamic and immersion tests are very similar, covering most of the steel. Polarization and EIS results corroborate poor behavior against corrosion. |
| Keywords: | A. API-X52 C. Acid sour media C. Film formation C. Corrosion |
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