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Electrochemical investigations of steel corrosion in saline media

Cakir-Wuttk, Pelin; Finck, Nicolas

Abstract:
Steel is planned to encapsulate the high-level nuclear waste under the chosen repository for long-term. One of the possible repository formations is Salt Rock. Even though genuine rock salt is largely impermeable, for the safety assessments contact of saline brines with the surface of the steel must be investigated in order to study corrosion behaviour and thus to decide on the suitability of the material as a technical barrier. For this purpose, AISI 309S and Spheroidal Graphite Iron (SGI)´s corrosion properties are examined with electrochemical methods. Microscopic and spectroscopic analytics are used for examining surface alteration and corrosion product formation. Anoxic conditions were ensured during corrosion experiments and surface analyses.
Steels were cut into discs, and polished with carbide papers and diamond paste, followed by cleaning in an ultrasonic bath to be used as working electrode. Ag/AgCl (sat. KCl) and Pt are used for reference electrode and counter electrode, respectively, for a three-electrode cell. Prior to each experiment, electrolytes (variable ionic strengths (I) set by NaCl and MgCl2 concentrations) were deaerated with argon gas and samples were cathodically cleaned at -1.2V for 5 min.
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Volltext §
DOI: 10.5445/IR/1000128628
Veröffentlicht am 15.01.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Vortrag
Publikationsdatum 10.09.2020
Sprache Englisch
Identifikator KITopen-ID: 1000128628
HGF-Programm 32.01.01 (POF II, LK 01)
Veranstaltung Annual Congress of the European Federation of Corrosion (EUROCORR 2020), Online, 07.09.2020 – 11.09.2020
Projektinformation KORSO (BMWi, 02E11496B)
Bemerkung zur Veröffentlichung Die Veranstaltung fand wegen der Corona-Pandemie als Online-Event statt
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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