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Metallic, oxygen-containing reaction products after polarisation of iron in H2S saturated saline solutions

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Genchev,  Georgi
Interface Spectroscopy, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Cox,  Karsten
Interface Spectroscopy, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Tran,  The Hai
Corrosion, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Sarfraz,  Adnan
Interface Spectroscopy, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Erbe,  Andreas
Interface Spectroscopy, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Genchev, G., Cox, K., Tran, T. H., Sarfraz, A., Bosch, C., Spiegel, M., et al. (2015). Metallic, oxygen-containing reaction products after polarisation of iron in H2S saturated saline solutions. Corrosion Science, 98, 725-736. doi:10.1016/j.corsci.2015.06.017.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0028-12F4-6
Abstract
Corrosion of Fe in H2S containing solutions is a general problem in oil production. Here, layers rich in the the tetragonal FeS modification mackinawite were grown by polarisation of iron 200mV above the corrosion potential in H2S saturated acetic saline solution. These layers have no band gap above room temperature thermal energy, hence behave metallic. The sulfide layers are duplex layers, with an inner, oxide-rich and an outer, oxide-poor region. Strain induced by differences in oxygen content may be responsible for the poor adhesion between the two layers, which leads to eventual loss of the outer layer. © 2015 Elsevier Ltd.