Role of Manganese Dioxide in Corrosion in the Presence of Natural Biofilms

Ruppel, D.; Dexter, Stephen C.; Luther, George W.

doi:10.5006/1.3290313

Cited by 31 publications

(14 citation statements)

References 4 publications

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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%

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The influence of sunlight on the localized corrosion of UNS S31600 in natural seawater

et al. 2011

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Tests were conducted on the performance of UNS S31600 stainless steel (SS) in a natural day/night cycle vs full darkness under conditions of natural marine biofilm accumulation. In quiescent flowing seawater tests in the laboratory as well as under natural immersion in the sea, diffuse sunlight (∼10% of natural) counteracted the influence of marine biofilms and produced substantial inhibition of the corrosion of SS. Thus, the probabilities (percentage attack) and propagation rates (depths of attack) in multiple crevice tests were substantially lower in the day/night cycle than in the dark. A benefit was also observed for welded SS in terms of the time to corrosion initiation and the mass loss. SS in the passive state showed broader passive regions, well-defined breakdown potentials and markedly smaller anodic and cathodic current densities under the diurnal cycle. The overall reduction in corrosion is attributed to a combination of electrochemical photoinhibition and simultaneous photoinactivation of microbially mediated metal redox reactions linked to cathodic kinetics. These data offer fresh insights into the behaviour of SS under practical seawater situations and the proposed potential use of illumination in the mitigation of biologically influenced consequences.

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Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 97%

The influence of sunlight on the localized corrosion of UNS S31600 in natural seawater

et al. 2011

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“…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%

Synergistic effect p-phenylenediamine and n,n diphenylthiourea on the electrochemical corrosion behaviour of mild steel in dilute acid media

2015

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Electrochemical studies of the synergistic effect of p-phenylenediamine and n,n diphenylthiourea (TPD) as corrosion inhibitor of mild steel in dilute sulphuric and hydrochloric acid through weight loss and potentiodynamic polarization at ambient temperature were performed. Experimental results showed the excellent performance of TPD with an optimal inhibition efficiency of 88.18 and 93.88 % in sulphuric and 87.42 and 87.15 % in hydrochloric acid from both tests at all concentration studied. Polarization studies show the compound to be a mixed-type inhibitor. Adsorption of deanol on the steel surface was observed to obey the Langmuir and Frumkin isotherm models. X-ray diffractometry confirmed the absence of corrosion products and complexes. Optical microscopy confirmed the selective inhibition property of TPD to be through chemical adsorption on the steel surface.

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“…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%

Effect of Iron-Oxidizing Bacteria on Pitting of Stainless Steel

Chamritski¹,

Burns²,

Webster³

et al. 2004

CORROSION

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Microbiologically influenced corrosion (MIC) of stainless steel (SS) can be caused by the action of metal-oxidizing bacteria (MOB) in natural, relatively low-chloride waters. This type of corrosion is frequently associated with ennoblement of the open-circuit potential and involves iron-oxidizing bacteria (IOB) and manganese-oxidizing bacteria (MnOB). This work focuses of the role of IOB and associated inorganic water chemistry processes that may cause corrosion of SS. Laboratory and field studies have been conducted to investigate the influence of deposited ferric oxide (or oxyhydroxide) on the corrosion of UNS S30403. Samples exposed to a natural spring water reached open-circuit potentials of 250 mV vs saturated calomel electrode (SCE) and were covered by a biofilm containing a mixture of geothite (α-FeOOH), lepidocrocite (γ-FeOOH), and magnetite (Fe 3 O 4 ) or maghemite (γ-Fe 2 O 3 ), together with low levels of manganese-based deposits. In the laboratory, an iron-based film was formed on some samples by oxidation of ferrous sulfate (FeSO4 ) with calcium hypochlorite (Ca[ClO] 2 ), giving a surface film with a composition similar to that produced by microbial activity. These samples did not show ennoblement, but they did show lower pitting potentials than were measured for control samples. The results of this work are consistent with the idea that MIC of SS in potable water involves manganesebased deposits causing ennoblement (W.H. Dickinson, F. Caccavo Jr.

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Role of Manganese Dioxide in Corrosion in the Presence of Natural Biofilms

Cited by 31 publications

References 4 publications

The influence of sunlight on the localized corrosion of UNS S31600 in natural seawater

The influence of sunlight on the localized corrosion of UNS S31600 in natural seawater

Synergistic effect p-phenylenediamine and n,n diphenylthiourea on the electrochemical corrosion behaviour of mild steel in dilute acid media

Effect of Iron-Oxidizing Bacteria on Pitting of Stainless Steel

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