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Microscopic investigation of mill scale and its proposed effect on the variability of chloride-induced depassivation of carbon steel rebar
Mill scale on carbon steel rebar contains voids, crevices and cracks. Electrochemical experiments have shown that mill scale on carbon steel rebar affects corrosion initiation and variability associated with chloride-induced depassivation thresholds. In this study, scanning electron microscopy and focused ion beam microscopy were used to investigate the properties of mill scale and its effect on chloride thresholds of the underlying steel. As-received rebars have low chloride thresholds due to mill scale crevices.The variability found in the literature for chloride thresholds is suggested to result, in part, from the variability in the physical and chemical properties of mill scale. A crevice corrosion mechanism is proposed to explain why as-received rebar is more susceptible to depassivation than rebar without mill scale.
Microscopic investigation of mill scale and its proposed effect on the variability of chloride-induced depassivation of carbon steel rebar
Mill scale on carbon steel rebar contains voids, crevices and cracks. Electrochemical experiments have shown that mill scale on carbon steel rebar affects corrosion initiation and variability associated with chloride-induced depassivation thresholds. In this study, scanning electron microscopy and focused ion beam microscopy were used to investigate the properties of mill scale and its effect on chloride thresholds of the underlying steel. As-received rebars have low chloride thresholds due to mill scale crevices.The variability found in the literature for chloride thresholds is suggested to result, in part, from the variability in the physical and chemical properties of mill scale. A crevice corrosion mechanism is proposed to explain why as-received rebar is more susceptible to depassivation than rebar without mill scale.
Microscopic investigation of mill scale and its proposed effect on the variability of chloride-induced depassivation of carbon steel rebar
Mikroskopische Untersuchung von Walzzunder und seine abzusehende Wirkung auf die Veränderlichkeit der chloridinduzierten Depassivierung einer Armierung aus Kohlenstoffstahl
Ghods, P. (author) / Isgor, O.B. (author) / McRae, G.A. (author) / Li, J. (author) / Gu, G.P. (author)
Corrosion Science ; 53 ; 946-954
2011
9 Seiten, 9 Bilder, 2 Tabellen, 30 Quellen
Article (Journal)
English
Walzzunder , Stahlbeton , Spaltkorrosion , Lochfraßkorrosion , Chlorid , Passivitätsverlust , Korrosionspotenzial , elektrochemische Impedanzspektrometrie , Polarisationskurve , Oberflächenschicht , Porenlösung , Rasterelektronenmikroskopie , energiedispersive Röntgenspektrometrie , Korrosionsmechanismus
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