Stainless steel ennoblement in freshwater: From exposure tests to mechanisms

Marconnet, C.; Dagbert, C.; Roy, M.; Féron, Damien

doi:10.1016/j.corsci.2008.05.007

Cited by 43 publications

(31 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The same phenomenon was observed by Marconnet et al [18] while following the evolution of the free potential of corrosion with time on samples of steel immersed in fresh water during 18 days in spring. They obtained curves presenting oscillations similar to those obtained in Fig.…”

Section: Resultssupporting

confidence: 71%

Electrochemical behavior of the 316L steel type in a marine culture of microalgae (Porphyridium purpureum) under the 12/12 h photoperiod and effect of different working electrode exposure conditions on the biofilm–metal interface

Djemai-Zoghlache

Isambert

Belhaneche‐Bensemra

2011

J Ind Microbiol Biotechnol

View full text Add to dashboard Cite

The industrial crops of microalgae use processes calling upon the presence of parts of metal nature such as steel 316L type. The goal of this study is to test the electrochemical behavior of this material in a marine culture of microalgae. Porphyridium purpureum was used under a photoperiod of alternation darkness/light 12/12 h, in order to apprehend the problems of biocorrosion involved in the biofouling. The evolution of the free potential of corrosion, according to the position of the samples and for different surface roughness, observations of the surface quality under the electron microscope with sweeping were carried out. The results showed that, overall, the strain P. purpureum does not have a corrosive effect on the 316L. The free potential of corrosion lies between -0.307 and -0.005 V(SCE). The adhesion of the cells seems stronger on the interface air/solid of the half-plunged sample with surface grit polished 1,000, confirmed by the presence of biofilm on the air part. The photoperiod acts on the evolution of the generated free potential of corrosion of the one 24-h period oscillation. Furthermore, the samples plunged horizontally lead to a stabilizing effect on the potential of free corrosion.

show abstract

Section: Resultssupporting

confidence: 71%

Electrochemical behavior of the 316L steel type in a marine culture of microalgae (Porphyridium purpureum) under the 12/12 h photoperiod and effect of different working electrode exposure conditions on the biofilm–metal interface

Djemai-Zoghlache

Isambert

Belhaneche‐Bensemra

2011

J Ind Microbiol Biotechnol

View full text Add to dashboard Cite

show abstract

“…Along with PRB colonization and development, metallic electrodes allowed the observation of significant increases of electrochemical potentials, reaching plateaus in the range of ϩ80 to ϩ120 mV/SCE for stainless steel and Ϫ70 to ϩ60 mV/SCE for copper electrodes, comparable with those obtained for lotic freshwater biofilms on stainless steel supports (19,44). Mechanisms reported to be responsible for electrochemical potential increases include production by biofilm microorganisms of oxidizing agents through enzyme catalysis, e.g., H 2 O 2 or manganese oxide in manganese-rich environments; modification of the composition of the oxide layer of stainless steel; and production of some compounds that adsorb on the material surface and play the role of electro-catalysts (33).…”

Section: Discussionmentioning

confidence: 63%

“…Mechanisms reported to be responsible for electrochemical potential increases include production by biofilm microorganisms of oxidizing agents through enzyme catalysis, e.g., H 2 O 2 or manganese oxide in manganese-rich environments; modification of the composition of the oxide layer of stainless steel; and production of some compounds that adsorb on the material surface and play the role of electro-catalysts (33). While electroactivity has been described mainly for bacterial strains, previous studies demonstrated that algae were also involved (34,48), causing day-night fluctuations of the electrochemical potential recorded on stainless steel (44). Algae modify the local production of O 2 through photosynthesis, contributing to an increase of the recorded electrochemical potentials during photosynthesis periods.…”

Section: Discussionmentioning

confidence: 99%

Electroactivity of Phototrophic River Biofilms and Constitutive Cultivable Bacteria

Lyautey

Cournet

Morin

et al. 2011

Appl Environ Microbiol

View full text Add to dashboard Cite

Electroactivity is a property of microorganisms assembled in biofilms that has been highlighted in a variety of environments. This characteristic was assessed for phototrophic river biofilms at the community scale and at the bacterial population scale. At the community scale, electroactivity was evaluated on stainless steel and copper alloy coupons used both as biofilm colonization supports and as working electrodes. At the population scale, the ability of environmental bacterial strains to catalyze oxygen reduction was assessed by cyclic voltammetry. Our data demonstrate that phototrophic river biofilm development on the electrodes, measured by dry mass and chlorophyll a content, resulted in significant increases of the recorded potentials, with potentials of up to ؉120 mV/saturated calomel electrode (SCE) on stainless steel electrodes and ؉60 mV/SCE on copper electrodes. Thirty-two bacterial strains isolated from natural phototrophic river biofilms were tested by cyclic voltammetry. Twenty-five were able to catalyze oxygen reduction, with shifts of potential ranging from 0.06 to 0.23 V, cathodic peak potentials ranging from ؊0.36 to ؊0.76 V/SCE, and peak amplitudes ranging from ؊9.5 to ؊19.4 A. These isolates were diversified phylogenetically (Actinobacteria, Firmicutes, Bacteroidetes, and Alpha-, Beta-, and Gammaproteobacteria) and exhibited various phenotypic properties (Gram stain, oxidase, and catalase characteristics). These data suggest that phototrophic river biofilm communities and/or most of their constitutive bacterial populations present the ability to promote electronic exchange with a metallic electrode, supporting the following possibilities: (i) development of electrochemistry-based sensors allowing in situ phototrophic river biofilm detection and (ii) production of microbial fuel cell inocula under oligotrophic conditions.

show abstract

“…The potential of both samples shifts towards the positive direction, eventually stabilising with immersion time due to the formation of a passive film on the steel surface. This increase, often termed 'ennoblement', is generally associated with an increase of the cathodic reaction rate (O 2 reduction in aerated water, that favours oxide film formation) [22][23][24]. The cathodic reaction decreases as a result of the formation of a passive film which in turn increases the resistance to electron transfer through the film and decreases the electrochemical activity of the surface.…”

Section: Secm Measurementsmentioning

confidence: 99%

“…Additionally, OCP values for both materials increase and this increase diminishes with immersion time due to the passive film formation. According to the literature [22][23][24], an increase in OCP is associated with an increase in the rate of the cathodic reaction. Therefore, when the passive film grows and diminishes the cathodic activity of the electrode surface, the rate of change of the OCP would also be expected to diminish.…”

Section: Secm Testsmentioning

confidence: 99%

Study of the sensitisation of a highly alloyed austenitic stainless steel, Alloy 926 (UNS N08926), by means of scanning electrochemical microscopy

Leiva-García

Akid

Greenfield

et al. 2012

Electrochimica Acta

View full text Add to dashboard Cite

ElsevierLeiva García, R.; Akid, R.; Greenfield, D.; Gittens, J.; Muñoz Portero, MJ.; García Antón, J. (2012) AbstractThe feedback mode of scanning electrochemical microscope (SECM) was applied to study differences in the reactivity of a highly alloyed austenitic stainless steel, Alloy 926 (UNS N08926), in its unsensitised and sensitised state. Alloy 926 was heated at 825 ºC for 1 hour in an inert atmosphere in order to produce a sensitised metallurgical condition. Sensitisation was due to chromium carbide formation at the grain boundaries.The oxygen reduction reaction was used as an indicator to monitor the effect of the sensitisation process on the corrosion activity of the Alloy 926 surface in a 35 g l -1 NaCl solution. Higher oxygen consumption was observed above the sensitised sample than above the unsensitised sample due to differences in the oxide films of the two alloy conditions.

show abstract

Stainless steel ennoblement in freshwater: From exposure tests to mechanisms

Cited by 43 publications

References 23 publications

Electrochemical behavior of the 316L steel type in a marine culture of microalgae (Porphyridium purpureum) under the 12/12 h photoperiod and effect of different working electrode exposure conditions on the biofilm–metal interface

Electrochemical behavior of the 316L steel type in a marine culture of microalgae (Porphyridium purpureum) under the 12/12 h photoperiod and effect of different working electrode exposure conditions on the biofilm–metal interface

Electroactivity of Phototrophic River Biofilms and Constitutive Cultivable Bacteria

Study of the sensitisation of a highly alloyed austenitic stainless steel, Alloy 926 (UNS N08926), by means of scanning electrochemical microscopy

Contact Info

Product

Resources

About