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Electrochemical investigation of chloride-induced depassivation of black steel rebar under simulated service conditions
Electrochemical measurements (free corrosion potential (FCP), linear polarization resistance (LPR), electrochemical impedance spectroscopy (EIS) and anodic polarization (AP)) of chloride thresholds are reported in simulated concrete pore solution for as-received and surface-modified rebar in an experimental apparatus designed to simulate service conditions. The actual concentrations of the anions and cations in solution were measured using inductively coupled plasma-atomic emission spectroscopy (ICP-AES). Surface modification led to higher chloride thresholds and reduced variability. The variability in thresholds for as-received rebar was represented by a log-normal distribution; therefore, simple averages of chloride thresholds, without reference to underlying distribution, might not provide reliable indicators of depassivation. The relative constancy of electrochemical measurements below thresholds, and the dependence of the thresholds on surface conditions, suggests that rebar depassivation is likely caused by local critical chemical conditions at the steel surface.
Electrochemical investigation of chloride-induced depassivation of black steel rebar under simulated service conditions
Electrochemical measurements (free corrosion potential (FCP), linear polarization resistance (LPR), electrochemical impedance spectroscopy (EIS) and anodic polarization (AP)) of chloride thresholds are reported in simulated concrete pore solution for as-received and surface-modified rebar in an experimental apparatus designed to simulate service conditions. The actual concentrations of the anions and cations in solution were measured using inductively coupled plasma-atomic emission spectroscopy (ICP-AES). Surface modification led to higher chloride thresholds and reduced variability. The variability in thresholds for as-received rebar was represented by a log-normal distribution; therefore, simple averages of chloride thresholds, without reference to underlying distribution, might not provide reliable indicators of depassivation. The relative constancy of electrochemical measurements below thresholds, and the dependence of the thresholds on surface conditions, suggests that rebar depassivation is likely caused by local critical chemical conditions at the steel surface.
Electrochemical investigation of chloride-induced depassivation of black steel rebar under simulated service conditions
Elektrochemische Untersuchung der chloridinduzierten Depassivierung von unlegierter Stahlbewehrung unter simulierten Betriebsbedingungen
Ghods, P. (author) / Isgor, O.B. (author) / McRae, G.A. (author) / Gu, G.P. (author)
Corrosion Science ; 52 ; 1649-1659
2010
11 Seiten, 14 Bilder, 4 Tabellen, 56 Quellen
Article (Journal)
English
Passivität , Passivitätsverlust , Lochkorrosion , Stahlbeton , Bewehrungsstahl , Simulationsversuch , Porenlösung , Porenwasser , Chlorid , Grenzwert , Polarisationskurve , anodische Polarisation , potentiostatische Prüfung , elektrochemische Impedanzspektrometrie , elektrochemische Zelle , Korrosionspotenzial
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