H2S corrosion is a serious problem in connection with oil production. One of the reasons for the increased corrosion when H2S is present is the formation of an iron sulphide film. This film enhances the hydrogen evolution. The aim of the work is to form films on Fe, similar to the Ni films, and see whether these films have similar cacalytic properties with respect to the hydrogen evolution reaction. If the films are formed also during H2S corrosion, this could explain some of the heavy corrosion, which is often observed in H2S environments. Amorphous FeSx films were formed by electrodeposition from an aqueous solution containing Fe(2+) ions and thiourea. The structure of the film was studied using transmission electron spectroscopy (TEM), X-ray, electron diffraction and scanning electron microscopy (SEM). The sulphur content of the film was determined by energy dispersive X-ray (EDX) in connection with the SEM analysis. No X-ray diffraction spectra were found. Some of the films were found to have nanocrystals of alpha-iron ''floating'' in an amorphous mass of sulphur containing iron. The film has a density equal to 5.4 gcm-2, which is heavier than the normal iron sulphides, but much lighter than metallic iron. The films are strongly reactive, and both the anodic and cathodic reaction rates are catalysed, resulting in an up to 1000-fold increase in the corrosion rate. The formation of such films may explain some of the heavy corrosion sometimes observed when iron is exposed to H2S.


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    Titel :

    The hydrogen evolution and corrosion of amorphous FeSx films


    Weitere Titelangaben:

    Wasserstoffentwicklung und Korrosion an amorphen FeSx-Filmen


    Beteiligte:
    Valand, T. (Autor:in) / Burchardt, T. (Autor:in) / Meer, S.F. van der (Autor:in)

    Erschienen in:

    Corrosion Science ; 43 , 1 ; 147-156


    Erscheinungsdatum :

    2001


    Format / Umfang :

    10 Seiten, 8 Bilder, 1 Tabelle, 10 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch