Caracterización de productos de corrosión del acero de construcción de oleoductos mediante el empleo de diferentes técnicas analíticas.

Construction steel of oil facilities manifests different affectations for corrosion phenomenon. One of the main causes constitutes for corrosion is the presence of the accompanying water of the petroleum. The one mentioned corrosive medium it is conductive of the electric current and for their varied composition: carbon dioxide (CO2), hydrogen sulphide (H2S) and chlorides in dissolution, they generate inside corrosion. As a result of this process, they corrosion products are formed such as: iron sulphide (II) and iron carbonate (II) in dependence of the operation conditions: temperature, the corrosive agent's concentration and pressure. In the present paper the fundamental objective was to establish at laboratory scale the chemical and morphology composition of the corrosion products that are formed during the construction pipelines steel corrosion, in a saline polluted medium with carbon dioxide and hydrogen sulphide to 70°C, according at operation conditions. The spectroscopy dispersive of rays X energy technique allowed the obtaining the elementary composition of the chemical compounds and bay rays X diffraction were detected iron oxihydroxides: lepidocrocite (- FeOOH) and goethite (- FeOOH) . The Scanning Electron Microscopy identified different morphologies: lengthened cubes, splinter, floral structure, muddy or cracked sedimentary and sandy, those that are composed mainly by iron and oxygen. [ABSTRACT FROM AUTHOR]