Field sludge characterization obtained from inner of pipelines |
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| Authors: | N Nava E Sosa JL Alamilla C Knigth A Contreras |
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| Affiliation: | aInstituto Mexicano del Petróleo, Programa de Integridad de Ductos, Eje Central Lázaro Cárdenas Norte #152, San Bartolo Atepehuacan, C.P. 07730, Mexico;bPEMEX Refinación, Avenida Marina Nacional #329, Edificio B-2, Piso 11, C.P. 11311, Mexico |
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| Abstract: | Physicochemical characterization of sludge obtained from refined hydrocarbons transmission pipeline was carried out through Mössbauer spectroscopy and X-ray diffraction. The Mössbauer and X-ray patterns indicate the presence of corrosion products composed of different iron oxide and sulfide phases. Hematite (α-Fe2O3), magnetite (Fe3O4), maghemite (γ-Fe2O3), magnetic and superparamagnetic goethite (α-FeOOH), pyrrhotite (Fe1−xS), akaganeite (β-FeOOH), and lepidocrocite (γ-FeOOH) were identified as corrosion products in samples obtained from pipeline transporting Magna and Premium gasoline. For diesel transmission pipeline, hematite, magnetite, and magnetic goethite were identified. Corrosion products follow a simple reaction mechanism of steel dissolution in aerated aqueous media at a near-neutral pH. Chemical composition of the corrosion products depends on H2O and sulfur inherent in fluids (traces). These results can be useful for decision-making with regard to pipeline corrosion control. |
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| Keywords: | A Steel B Mö ssbauer Spectroscopy B X-ray diffraction C Internal oxidation C Rust |
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