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Corrosion and hydrogen permeation in H 2 S environments with O 2 contamination, Part 2: Impact of H 2 S partial pressure
RISE - Research Institutes of Sweden, Materials and Production, KIMAB. (Institut de la Corrosion)
IFP Energies Nouvelles, France.
Sorbonne Université, France.
Sorbonne Université, France.
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2019 (English)In: Corrosion, ISSN 0010-9312, E-ISSN 1938-159X, Vol. 75, no 4, p. 389-397Article in journal (Refereed) Published
Abstract [en]

Materials selection in the oil and gas industry relies on engineering standards, such as NACE TM0177 and NACE TM0284, which stipulate that oxygen contamination should be avoided during materials testing in H 2 S-containing media. In this second paper, as part of a series of articles that evaluates how traces of oxygen modify the corrosion of pure iron and hydrogen permeation across iron membranes in H 2 S-containing solutions, the impact of changing the H 2 S partial pressure from 100 kPa to 0.1 kPa was investigated. It was found that bulk solution chemistry for all H 2 S partial pressures changes with time, due to the formation of H 2 S–O 2 reaction products (sulfates, sulfites, and thiosulfates), which results in bulk solution acidification. Electrochemical and weight-loss measurements confirm that Fe corrosion rates in baseline well-deaerated H 2 S-containing solutions decrease with decreasing H 2 S partial pressure, although these are observed to be much higher under continuous oxygen contamination. With decreasing H 2 S partial pressure, hydrogen uptake in Fe also decreases, due to lower and lower concentrations of dissolved H 2 S and the associated increase in pH. However, even at 1 kPa and 0.1 kPa H 2 S, permeation effciencies remain close to 100% when no O 2 contamination is present. The hydrogen uptake is always relatively lower in Fe exposed to oxygen-polluted H 2 S solutions. Permeation efficiencies decrease continuously. From electrochemical data and surface characterization, these observations at lower H 2 S partial pressures are attributed to the disruptive effect of oxygen on the nature of sulfide corrosion products, and hydrogen entry promotion, along with the contribution of an additional cathodic reaction that does not result in hydrogen entry into the metal

Place, publisher, year, edition, pages
National Assoc. of Corrosion Engineers International , 2019. Vol. 75, no 4, p. 389-397
Keywords [en]
Hydrogen permeation, Hydrogen sulfide, Hydrogen-induced cracking, Sulfide stress cracking, Contamination, Corrosion rate, Gas industry, Hydrogen embrittlement, Materials testing, Partial pressure, Permeation, Solution mining, Sulfur compounds, Electrochemical data, Engineering standards, Hydrogen induced cracking, Oxygen contamination, Surface characterization, Weight loss measurements, Iron
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-39990DOI: 10.5006/3092OAI: oai:DiVA.org:ri-39990DiVA, id: diva2:1359529
Available from: 2019-10-09 Created: 2019-10-09 Last updated: 2019-10-09Bibliographically approved

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