Electrochemical behavior of metallic materials used in seawater—interactions between glucose oxidase and passive layers

L’Hostis, Valérie; Dagbert, C.; Féron, Damien

doi:10.1016/s0013-4686(03)00023-9

Cited by 54 publications

(37 citation statements)

References 8 publications

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“…Several mechanisms have been proposed to explain this catalysis. The production of hydrogen peroxide by the biofilm has been assumed to play a key role [32,37], modification of the oxide layers on stainless steel beneath the biofilm [38] may have an effect, involvement of extracellular compounds and enzymes [39][40][41][42] has also been proposed, and the preponderant involvement of manganese ions and manganese oxidising bacteria has been claimed [43]. It may be assumed that the actual mechanism depends on the nature of the environment, the nature of the stainless steel and the operating conditions, and that it may be the result of a combination of the different fundamental reactions that have been identified.…”

Section: Discussionmentioning

confidence: 99%

Electroactive biofilms: new means for electrochemistry

et al. 2006

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This work demonstrates that electrochemical reactions can be catalysed by the natural biofilms that form on electrode surfaces dipping into drinking water or compost. In drinking water, oxygen reduction was monitored with stainless steel ultra-microelectrodes under constant potential electrolysis at )0.30 V/SCE for 13 days. 16 independent experiments were conducted in drinking water, either pure or with the addition of acetate or dextrose. In most cases, the current increased and reached 1.5-9.5 times the initial current. The current increase was attributed to biofilm forming on the electrode in a similar way to that has been observed in seawater. Epifluorescence microscopy showed that the bacteria size and the biofilm morphology depended on the nutrients added, but no quantitative correlation between biofilm morphology and current was established. In compost, the oxidation process was investigated using a titanium based electrode under constant polarisation in the range 0.10-0.70 V/SCE. It was demonstrated that the indigenous micro-organisms were responsible for the current increase observed after a few days, up to 60 mA m )2 . Adding 10 mM acetate to the compost amplified the current density to 145 mA m )2 at 0.50 V/SCE. The study suggests that many natural environments, other than marine sediments, waste waters and seawaters that have been predominantly investigated until now, may be able to produce electrochemically active biofilms.

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Section: Discussionmentioning

confidence: 99%

Electroactive biofilms: new means for electrochemistry

et al. 2006

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“…The fine mechanism of this model is certainly more complex because of local acidification due to the sideproduction of gluconic acid, and also to complex interactions between the adsorbed enzyme and the oxide layers [7].…”

Section: Aerobic Corrosionmentioning

confidence: 99%

Recent Advances in Electron Transfer Between Biofilms and Metals

Bergel¹

2007

Advanced Materials Research

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Abstract. Microbial biofilms produce electrochemical interactions with metal surfaces by following a wide variety of different electron exchange pathways. Reviewing the mechanisms identified in the biocorrosion of steels leads us to distinguish direct and indirect mechanisms for biofilm-catalysed cathodic reactions. Indirect mechanisms are due to the production of metal oxides or hydrogen peroxide (aerobic corrosion) or metal sulphides (anaerobic corrosion), which further react with the metal surface. Direct mechanisms involve adsorbed biocompounds, generally enzymes or their active sites, which catalyse the cathodic reduction of oxygen for aerobic biocorrosion or the proton/water reduction in anaerobic processes. Recent studies dealing with the role of hydrogenases in anaerobic corrosion have shed light on the important role of phosphate species via so-called cathodic deprotonation. Advances in the development of microbial fuel cells have also resulted in new concepts, mainly for oxidation processes. Some microbial cells have been shown to be able to produce their own electron mediators. Others can transfer electrons directly to electrodes through membrane-bound electron shuttles or achieve long-range transfer through conductive pili.

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“…Mittila et al studied the development of biofilm on stainless steel during the increase of open circuit potential in natural seawater [9]. The cathodic and anodic reactions are related to semi-conducting properties of passive films, then the interaction between bacteria and p-type or n-type semi-conductors may be involved in the ennoblement [10]. Biofilm can also cause appreciable ennobling of other passive metal such as titanium in seawater [11].…”

Section: Introductionmentioning

confidence: 99%

Ennoblement of stainless steel in natural seawater – A new explanation

Li¹,

Jia

Wei

et al. 2007

Materials & Corrosion

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The ennoblement of corrosion potential (E corr ) of passive metal immersed in seawater was investigated with electrochemical technology and epifluorescence microscopy. The in situ observation showed that the bacteria number increased on the metal surface according to an exponential law which was in the same way with the ennoblement of E corr . At the same time, the anodic polarization current of high-Mo stainless steel decreased in the initial days. According to the mix-potential theory and the characteristics of polarization curves of high-Mo steel in natural seawater, the ennoblement of corrosion potential may be induced by the decrease of the passive current density.

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Electrochemical behavior of metallic materials used in seawater—interactions between glucose oxidase and passive layers

Cited by 54 publications

References 8 publications

Electroactive biofilms: new means for electrochemistry

Electroactive biofilms: new means for electrochemistry

Recent Advances in Electron Transfer Between Biofilms and Metals

Ennoblement of stainless steel in natural seawater – A new explanation

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