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Electrochemical impedance spectroscopy of iron corrosion in H2S solutions
RISE - Research Institutes of Sweden, Materials and Production, KIMAB. IFP Energies nouvelles, France. (Institut de la Corrosion)
Sorbonne Université, France.
Sorbonne Université, France.
IFP Energies nouvelles, France.
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2018 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 282, p. 775-783Article in journal (Refereed) Published
Abstract [en]

Corrosion of iron exposed to H2S saturated solution at pH 4 was studied by electrochemical impedance spectroscopy, weight loss coupons and surface analysis. Hydrogen permeation was also used as indirect means of evaluating the intensity of the proton reduction reaction leading to hydrogen entry into the metal. Since corrosion in this type of test solution results in the rapid build-up of a conductive and highly porous iron sulfide scale, a specific contribution of the film has to be considered. An impedance model was thus proposed. The faradaic anodic impedance consists of a two-step reaction with charge transfer and adsorption – desorption. An additional contribution, associated with the conductive and highly porous iron sulfide film was added in parallel. This contribution, mostly visible in the low frequency domain, presents a 45° tail associated with a porous electrode behavior. This model was well adapted to describe impedance diagrams measured at various exposure times, up to 620 h. Charge transfer resistance determined from impedance analysis allowed calculating the evolution with time of the corrosion current density. A very good correlation was found between this corrosion current density and the hydrogen permeation current density. As expected in our experimental conditions, a permeation efficiency close to 100% is demonstrated. Corrosion rate of 490 μm/year was measured by weight-loss specimens, confirming the validity of the impedance analysis, which resulted in a calculated corrosion rate of 530 μm/year.

Place, publisher, year, edition, pages
Elsevier Ltd , 2018. Vol. 282, p. 775-783
Keywords [en]
Corrosion, EIS, H2S, Iron, Porous electrode, Charge transfer, Corrosion rate, Current density, Electric impedance, Electrochemical impedance spectroscopy, Electrodes, Frequency domain analysis, Hydrogen, Permeation, Spectroscopy, Sulfur compounds, Surface analysis, Charge transfer resistance, Corrosion current densities, Experimental conditions, Hydrogen permeation, Hydrogen permeation current, Low frequency domain, Porous electrodes, Saturated solutions, Electrochemical corrosion
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-40001DOI: 10.1016/j.electacta.2018.06.052OAI: oai:DiVA.org:ri-40001DiVA, id: diva2:1359515
Available from: 2019-10-09 Created: 2019-10-09 Last updated: 2019-10-10Bibliographically approved

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