Steel gas pipelines are exposed externally to damage by surface corrosion and cracking phenomena. They are the main deterioration mechanism under coating failure and cathodic protection (CP) that can reduce the structural integrity of buried gas transmission pipelines where the soil aggressiveness and bacterial activity appear. Corrosion phenomenon is accentuated by the soil parameters influence such resistivity, pH, temperature, moisture content and chemical composition of electrolytes contained in the soil. Soil extract was prepared according to AFNOR French norm A-05.250 P.278. A mass of ground is taken, then mixed with distilled water and analyzed by spectrophotometry microanalysis. Soil parameters influence on pipeline steel corrosion behaviour exposed in near-neutral pH soil simulating solution has been investigated by potentiodynamic polarisation and EIS method. Results showed that the steel corrosion increases, corrosion current density increases with temperature in the range from 20 to 60 deg C. The associated activation energy has been determined. Impedance curves showed that the charge transfer resistance (Rt) increases with increasing immersion duration. Parameters such as corrosion current density (Icorr), polarization resistance (Rp), and soil resistivity (rho) can serve as the parameters for evaluation of soil corrosivity Results of this investigation showed that some operating buried transmission pipeline systems will develop unforeseen pits and cracking surface corrosion problems. They are principal threats for the buried structure where the humid clay soil aggressiveness and bacterial activity appear. Steel surface must be protected by a full protective system defined by an active cathodic protection to maintain steel in potentials protection in addition to passive coatings protection aiming to avoid any corrosion interaction between steel surface and soil environment. Future coating systems must answer the durability and reliability requirements in service in regard to economic aspects.


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    Titel :

    Corrosion behavior of API 5L X-60 pipeline steel exposed to near-neutral pH soil simulating solution


    Weitere Titelangaben:

    Korrosionsverhalten des Rohrstahles API 5L X-60 in einem nahezu neutralen simulierten Erdboden


    Beteiligte:
    BenMoussa, A. (Autor:in) / Hadjel, M. (Autor:in) / Traisnel, M. (Autor:in)

    Erschienen in:

    Materials and Corrosion ; 57 , 10 ; 771-777


    Erscheinungsdatum :

    2006


    Format / Umfang :

    7 Seiten, 5 Bilder, 9 Tabellen, 13 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch