2001
DOI: 10.5006/1.3290313
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Role of Manganese Dioxide in Corrosion in the Presence of Natural Biofilms

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Cited by 31 publications
(14 citation statements)
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“…The biofilm that formed in the dark, by reason of little if any photosynthetic activity, could be envisioned as more oxygen-consuming and more acidproducing than that in the diurnal cycle. Although oxygen reduction is the principal cathodic reaction for SS in near-neutral and moderately alkaline conditions, the increase in cathodic kinetics during biofilm development is generally believed to involve metal redox reactions such as manganese (Mn) cycling (eg Dickinson et al 1996;Ruppel et al 2001;Dexter et al 2003). This is because, under the low light conditions that most investigators have studied cathodic kinetics, biofilm should decrease rather than increase the interfacial oxygen level (the 'paradox' in Dexter and Gao 1988).…”
Section: Discussionmentioning
confidence: 96%
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“…The biofilm that formed in the dark, by reason of little if any photosynthetic activity, could be envisioned as more oxygen-consuming and more acidproducing than that in the diurnal cycle. Although oxygen reduction is the principal cathodic reaction for SS in near-neutral and moderately alkaline conditions, the increase in cathodic kinetics during biofilm development is generally believed to involve metal redox reactions such as manganese (Mn) cycling (eg Dickinson et al 1996;Ruppel et al 2001;Dexter et al 2003). This is because, under the low light conditions that most investigators have studied cathodic kinetics, biofilm should decrease rather than increase the interfacial oxygen level (the 'paradox' in Dexter and Gao 1988).…”
Section: Discussionmentioning
confidence: 96%
“…A number of investigators across the world have shown enhanced cathodic kinetics in which the current densities for these alloys in the passive state increase concomitantly with the settlement and growth of biofilms (Mollica and Trevis 1976;Dexter and Gao 1988;Dickinson et al 1996;Martin et al 2006;Eashwar et al 2009). Implications for the biofilm-enhanced cathodic kinetics for SS under marine conditions are: (a) increased current demand for cathodic protection (Holthe et al 1987;Little et al 1988; Mollica et al 1989), (b) increased probability and propagation rates for crevice corrosion of the less corrosion resistant alloys (Kain and Lee 1985;Gallagher et al 1988;Zhang and Dexter 1995a), and (c) higher corrosion rates of anodes in galvanic couples (Dexter and LaFontaine 1998;Ruppel et al 2001;Eashwar et al 2009). …”
Section: Introductionmentioning
confidence: 97%
“…The classification of an organic compound as anodic-or cathodic-type inhibitor depends on the displacement of the corrosion potential values within and beyond 85 mV in the anodic or cathodic direction [28,29]. The maximum displacement value in 0.5 M H 2 SO 4 is 73 mV in the anodic direction and 17 mV in the anodic direction for 1 M HCl, and thus in 0.5 M H 2 SO 4 and 1 M HCl, TPD can be Tables 3 and 4 increases with increase in inhibition efficiency till the maximum studied concentration.…”
Section: Inhibition Mechanismmentioning
confidence: 99%
“…Although the level of manganese found in the surface deposits on our samples was only 0.55 wt%, Dickinson and coworkers 8,11 have shown that manganese quantities in the order of 0.2 wt% (of biofouling deposits) can cause ennoblement of SS. Similarly, Ruppel, et al, 28 estimated that the deposition of only 0.9 µ mol manganese dioxide (MnO 2 ) per cm 2 is sufficient for ennoblement. In the absence of control experiments (somehow avoiding biofilm formation), we cannot be sure that the samples in this work were ennobled by microbial effects.…”
Section: Field Workmentioning
confidence: 98%