Dépouillements

Biodeterioration of synthetic materials – A brief review / H.-C. Flemming in Materials and corrosion, Vol. 61 N° 12 (Décembre 2010)  

Public ISBD [article]  inMaterials and corrosion > Vol. 61 N° 12 (Décembre 2010) . - pp. 986–992 Titre : Biodeterioration of synthetic materials – A brief review Type de document : texte imprimé Auteurs : H.-C. Flemming, Auteur Année de publication : 2011 Article en page(s) : pp. 986–992 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Biodeterioration  biofilms  plastics Résumé : Although synthetic polymers are part of our global waste problem because they are not sufficiently biologically degraded, microorganisms can severely impair the properties and functions of these materials. It seems as if consumers do not really acknowledge this cause of problems and there is only sparse systematic research about. Damaging mechanisms include (i) covering of surfaces (biofouling) which may be enhanced by leaching of biodegradable additives, (ii) depletion of such additives which can lead to loss of material properties, (iii) intrusion into materials by fungal hyphae, (iv) water uptake, and (v) discoloration. The common countermeasure is the addition of biocides or simply to tolerate the effects of biodeterioration and live on with them. It is suggested to encourage further systematic research, and to develop integrated strategies in order to avoid problems, e.g., based on nutrient and water limitation whenever possible. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005837/abstract [article] Biodeterioration of synthetic materials – A brief review [texte imprimé] / H.-C. Flemming, Auteur . - 2011 . - pp. 986–992. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 12 (Décembre 2010) . - pp. 986–992 Mots-clés : Biodeterioration  biofilms  plastics Résumé : Although synthetic polymers are part of our global waste problem because they are not sufficiently biologically degraded, microorganisms can severely impair the properties and functions of these materials. It seems as if consumers do not really acknowledge this cause of problems and there is only sparse systematic research about. Damaging mechanisms include (i) covering of surfaces (biofouling) which may be enhanced by leaching of biodegradable additives, (ii) depletion of such additives which can lead to loss of material properties, (iii) intrusion into materials by fungal hyphae, (iv) water uptake, and (v) discoloration. The common countermeasure is the addition of biocides or simply to tolerate the effects of biodeterioration and live on with them. It is suggested to encourage further systematic research, and to develop integrated strategies in order to avoid problems, e.g., based on nutrient and water limitation whenever possible. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005837/abstract

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The anatomy of tubercles / R. I. Ray in Materials and corrosion, Vol. 61 N° 12 (Décembre 2010)  

Public ISBD [article]  inMaterials and corrosion > Vol. 61 N° 12 (Décembre 2010) . - pp. 993–999 Titre : The anatomy of tubercles : a corrosion study in a fresh water estuary Type de document : texte imprimé Auteurs : R. I. Ray, Auteur ; J. S. Lee, Auteur ; B. J. Little, Auteur Année de publication : 2011 Article en page(s) : pp. 993–999 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Carbon steel  corrosion  goethite  iron-oxidizing bacteria  lepidocrocite  magnetite  tubercle Résumé : The structure and mineralogy of corrosion products formed on carbon steel coupons exposed in Duluth Superior Harbor (DSH, USA), were investigated and compared with corrosion products on similar substrata from other locations. Corrosion products in DSH form within a few months each year and are removed by ice scour and reform. The corrosion products formed in DSH are tubercles with an outer surface, an inner shell of magnetite, and a core of iron(III) oxyhydroxides, goethite, and lepidocrocite, in association with stalks produced by bacteria. In general, the tubercles formed in DSH are similar in morphology and mineralogy to corrosion products described for carbon steel and cast iron exposed to treated waters in decades-old drinking water and cooling water systems. DSH tubercles are unique in several structural details. DSH tubercles increase areal coverage of the substratum by consolidation of tubercles. Furthermore, the core material extends into the pit and is an exact replica of the pit profile. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005739/abstract [article] The anatomy of tubercles : a corrosion study in a fresh water estuary [texte imprimé] / R. I. Ray, Auteur ; J. S. Lee, Auteur ; B. J. Little, Auteur . - 2011 . - pp. 993–999. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 12 (Décembre 2010) . - pp. 993–999 Mots-clés : Carbon steel  corrosion  goethite  iron-oxidizing bacteria  lepidocrocite  magnetite  tubercle Résumé : The structure and mineralogy of corrosion products formed on carbon steel coupons exposed in Duluth Superior Harbor (DSH, USA), were investigated and compared with corrosion products on similar substrata from other locations. Corrosion products in DSH form within a few months each year and are removed by ice scour and reform. The corrosion products formed in DSH are tubercles with an outer surface, an inner shell of magnetite, and a core of iron(III) oxyhydroxides, goethite, and lepidocrocite, in association with stalks produced by bacteria. In general, the tubercles formed in DSH are similar in morphology and mineralogy to corrosion products described for carbon steel and cast iron exposed to treated waters in decades-old drinking water and cooling water systems. DSH tubercles are unique in several structural details. DSH tubercles increase areal coverage of the substratum by consolidation of tubercles. Furthermore, the core material extends into the pit and is an exact replica of the pit profile. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005739/abstract

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Coatings against corrosion and microbial adhesion / J. Telegdi in Materials and corrosion, Vol. 61 N° 12 (Décembre 2010)  

Public ISBD [article]  inMaterials and corrosion > Vol. 61 N° 12 (Décembre 2010) . - pp. 1000–1007 Titre : Coatings against corrosion and microbial adhesion Type de document : texte imprimé Auteurs : J. Telegdi, Auteur ; T. Szabó, Auteur ; F. Al-Taher, Auteur Année de publication : 2011 Article en page(s) : pp. 1000–1007 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Anti-corrosion and anti-fouling nanocoatings  biofilm  Langmuir–Blodgett film  nanocoating  self-assembled molecular layer Résumé : A systematic study on anti-corrosion and anti-fouling effect of hydrophobic Langmuir–Blodgett and self-assembled molecular layers deposited on metal surfaces, as well as anti-microbial adhesion properties of coatings with biocide is presented. Both types of efficiencies produced by LB films are enhanced by Fe3+ ions built in the molecular film. The quaternary ammonium type biocide embedded into the cross-linked gelatin decreased significantly the microbial adhesion, the biofilm formation. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005797/abstract [article] Coatings against corrosion and microbial adhesion [texte imprimé] / J. Telegdi, Auteur ; T. Szabó, Auteur ; F. Al-Taher, Auteur . - 2011 . - pp. 1000–1007. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 12 (Décembre 2010) . - pp. 1000–1007 Mots-clés : Anti-corrosion and anti-fouling nanocoatings  biofilm  Langmuir–Blodgett film  nanocoating  self-assembled molecular layer Résumé : A systematic study on anti-corrosion and anti-fouling effect of hydrophobic Langmuir–Blodgett and self-assembled molecular layers deposited on metal surfaces, as well as anti-microbial adhesion properties of coatings with biocide is presented. Both types of efficiencies produced by LB films are enhanced by Fe3+ ions built in the molecular film. The quaternary ammonium type biocide embedded into the cross-linked gelatin decreased significantly the microbial adhesion, the biofilm formation. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005797/abstract

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Influence of bacterial exopolymers on cell adhesion of desulfovibrio vulgaris on high alloyed steel / R. Stadler in Materials and corrosion, Vol. 61 N° 12 (Décembre 2010)  

Public ISBD [article]  inMaterials and corrosion > Vol. 61 N° 12 (Décembre 2010) . - pp. 1008–1016 Titre : Influence of bacterial exopolymers on cell adhesion of desulfovibrio vulgaris on high alloyed steel : corrosion inhibition by extracellular polymeric substances (EPS) Type de document : texte imprimé Auteurs : R. Stadler, Auteur ; L. Wei, Auteur ; W. Fürbeth, Auteur Année de publication : 2011 Article en page(s) : pp. 1008–1016 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Biocorrosion  biofilms  cell adhesion  corrosion prevention  extracellular polymeric substances  MIC  MICI  microbial footprints  microbially influenced corrosion  inhibition Résumé : Extracellular polymeric substances (EPS) were studied with regard to their potential application as inhibitors of biocorrosion. EPS that have been isolated from biofilms of sulphate-reducing bacteria (SRB) were adsorbed on samples of high alloyed steel (type 1.4301) at different temperatures. The samples were exposed to SRB containing solution and afterwards analysed by fluorescence microscopy (FM). The results show that the EPS form an incomplete layer and lead to a smaller amount of cell adhesion when compared to pure surfaces. The results are discussed with regard to the application of EPS for the prevention of biofilm formation. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005819/abstract [article] Influence of bacterial exopolymers on cell adhesion of desulfovibrio vulgaris on high alloyed steel : corrosion inhibition by extracellular polymeric substances (EPS) [texte imprimé] / R. Stadler, Auteur ; L. Wei, Auteur ; W. Fürbeth, Auteur . - 2011 . - pp. 1008–1016. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 12 (Décembre 2010) . - pp. 1008–1016 Mots-clés : Biocorrosion  biofilms  cell adhesion  corrosion prevention  extracellular polymeric substances  MIC  MICI  microbial footprints  microbially influenced corrosion  inhibition Résumé : Extracellular polymeric substances (EPS) were studied with regard to their potential application as inhibitors of biocorrosion. EPS that have been isolated from biofilms of sulphate-reducing bacteria (SRB) were adsorbed on samples of high alloyed steel (type 1.4301) at different temperatures. The samples were exposed to SRB containing solution and afterwards analysed by fluorescence microscopy (FM). The results show that the EPS form an incomplete layer and lead to a smaller amount of cell adhesion when compared to pure surfaces. The results are discussed with regard to the application of EPS for the prevention of biofilm formation. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005819/abstract

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Electrochemical study of AISI 304 stainless steel during the exposure at the disinfectant solutions with fungal suspensions / M. Stoica in Materials and corrosion, Vol. 61 N° 12 (Décembre 2010)  

Public ISBD [article]  inMaterials and corrosion > Vol. 61 N° 12 (Décembre 2010) . - pp. 1017–1025 Titre : Electrochemical study of AISI 304 stainless steel during the exposure at the disinfectant solutions with fungal suspensions Type de document : texte imprimé Auteurs : M. Stoica, Auteur ; M. Bruma, Auteur ; G. Cârâc, Auteur Année de publication : 2011 Article en page(s) : pp. 1017–1025 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Corrosion rate  disinfectant  fungal suspensions  polarization curves  stainless steel Résumé : The effect of fungal suspensions on the disinfectant solution (Actisept with sodium dichloroisocyanurate as active substance, which releases 140 ppm active chlorine) and the corrosion behavior of type AISI 304 stainless steel (SS) were evaluated through linear polarization. The work presents a study of biocide Actisept solution as reference solution and the mixed solutions: reference biocide Actisept solution with three fungal suspensions (10 vol%), Aspergillus niger, Candida mycoderma, and Saccharomyces cerevisiae. The fungal suspension has an important influence on the synergistic effect of the SS corrosion in the following order: Saccharomyces cerevisiae > Candida mycoderma > Aspergillus niger. The Ecorr values from the mixed solutions decreased with immersion time of the samples. In the case of Aspergillus niger, the corrosion rate was lower than that of any other type of fungal suspension tested, because the arrangement in solutions, the size and composition of Aspergillus niger spores were more favorable to protect the spores of the chemical and the electrical stressing. The results showed that there is a synergistic effect between the active substances from the disinfectant, fungal suspensions and applied potential, thus this effect can be taken into consideration for the hygienic and safety food industry. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005809/abstract [article] Electrochemical study of AISI 304 stainless steel during the exposure at the disinfectant solutions with fungal suspensions [texte imprimé] / M. Stoica, Auteur ; M. Bruma, Auteur ; G. Cârâc, Auteur . - 2011 . - pp. 1017–1025. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 12 (Décembre 2010) . - pp. 1017–1025 Mots-clés : Corrosion rate  disinfectant  fungal suspensions  polarization curves  stainless steel Résumé : The effect of fungal suspensions on the disinfectant solution (Actisept with sodium dichloroisocyanurate as active substance, which releases 140 ppm active chlorine) and the corrosion behavior of type AISI 304 stainless steel (SS) were evaluated through linear polarization. The work presents a study of biocide Actisept solution as reference solution and the mixed solutions: reference biocide Actisept solution with three fungal suspensions (10 vol%), Aspergillus niger, Candida mycoderma, and Saccharomyces cerevisiae. The fungal suspension has an important influence on the synergistic effect of the SS corrosion in the following order: Saccharomyces cerevisiae > Candida mycoderma > Aspergillus niger. The Ecorr values from the mixed solutions decreased with immersion time of the samples. In the case of Aspergillus niger, the corrosion rate was lower than that of any other type of fungal suspension tested, because the arrangement in solutions, the size and composition of Aspergillus niger spores were more favorable to protect the spores of the chemical and the electrical stressing. The results showed that there is a synergistic effect between the active substances from the disinfectant, fungal suspensions and applied potential, thus this effect can be taken into consideration for the hygienic and safety food industry. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005809/abstract

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Influence of a biopolymer admixture on corrosion behaviour of steel rebars in concrete / S. Roux in Materials and corrosion, Vol. 61 N° 12 (Décembre 2010)  

Public ISBD [article]  inMaterials and corrosion > Vol. 61 N° 12 (Décembre 2010) . - pp. 1026–1033 Titre : Influence of a biopolymer admixture on corrosion behaviour of steel rebars in concrete Type de document : texte imprimé Auteurs : S. Roux, Auteur ; N. Bur, Auteur ; G. Ferrari, Auteur Année de publication : 2011 Article en page(s) : pp. 1026–1033 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Concrete rebars  corrosion  exopolysaccharides  electrochemical impedance spectroscopy Résumé : Among the multitude of concrete structure pathologies, corrosion of rebars is one of the most important problems of concrete durability. In the context of sustainable development, it appears of primary importance to develop new means to protect the rebars against corrosion. This study aims to develop a new eco-friendly and corrosion-inhibiting admixture based on EPS 180 exopolysaccharides, biopolymers used in coatings already studied for the corrosion inhibition on steel in seawater. C15 rebars embedded in CEMI and CEMV cement paste containing EPS 180 were immersed in natural seawater and their electrochemical behaviour was studied using open circuit potential measurements and electrochemical impedance spectroscopy. These tests highlight the decrease of the cathodic reaction kinetics due to the EPS 180 action at the rebars surface, and the absence of effect on the passive layer. Capillary imbibition tests carried out on cement paste and mortars showed that although limiting the imbibition kinetics for cement pastes, the EPS 180 did not influence the water imbibition of mortars. Tests comparing capillary imbibition of soaked cement pastes and mortars with EPS 180 solution and the same samples containing the EPS 180 admixture highlight that the corrosion inhibition induced by EPS 180 admixture is more due to the modification of the cement – rebars interface than to the clogging of the cement porous network. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005805/abstract [article] Influence of a biopolymer admixture on corrosion behaviour of steel rebars in concrete [texte imprimé] / S. Roux, Auteur ; N. Bur, Auteur ; G. Ferrari, Auteur . - 2011 . - pp. 1026–1033. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 12 (Décembre 2010) . - pp. 1026–1033 Mots-clés : Concrete rebars  corrosion  exopolysaccharides  electrochemical impedance spectroscopy Résumé : Among the multitude of concrete structure pathologies, corrosion of rebars is one of the most important problems of concrete durability. In the context of sustainable development, it appears of primary importance to develop new means to protect the rebars against corrosion. This study aims to develop a new eco-friendly and corrosion-inhibiting admixture based on EPS 180 exopolysaccharides, biopolymers used in coatings already studied for the corrosion inhibition on steel in seawater. C15 rebars embedded in CEMI and CEMV cement paste containing EPS 180 were immersed in natural seawater and their electrochemical behaviour was studied using open circuit potential measurements and electrochemical impedance spectroscopy. These tests highlight the decrease of the cathodic reaction kinetics due to the EPS 180 action at the rebars surface, and the absence of effect on the passive layer. Capillary imbibition tests carried out on cement paste and mortars showed that although limiting the imbibition kinetics for cement pastes, the EPS 180 did not influence the water imbibition of mortars. Tests comparing capillary imbibition of soaked cement pastes and mortars with EPS 180 solution and the same samples containing the EPS 180 admixture highlight that the corrosion inhibition induced by EPS 180 admixture is more due to the modification of the cement – rebars interface than to the clogging of the cement porous network. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005805/abstract

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Twenty years of experience with corrosion failures caused by manganese oxidizing microorganisms / P. Linhardt in Materials and corrosion, Vol. 61 N° 12 (Décembre 2010)  

Public ISBD [article]  inMaterials and corrosion > Vol. 61 N° 12 (Décembre 2010) . - pp. 1034–1039 Titre : Twenty years of experience with corrosion failures caused by manganese oxidizing microorganisms Type de document : texte imprimé Auteurs : P. Linhardt, Auteur Année de publication : 2011 Article en page(s) : pp. 1034–1039 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Case histories  manganese oxidizing microorganisms  microbially influenced corrosion Résumé : Manganese oxidizing microorganisms are known as ubiquitous species in soil and fresh water. Their ability to extract dissolved manganese even at minute concentrations from the water and to biomineralize it as manganese(III/IV)oxides makes them potentially relevant for corrosion processes in technical systems carrying freshwater. These oxides are known as strong oxidants and may act as catalyst for the oxygen reduction reaction. Thus, they are cathodically active, possibly driving anodic metal dissolution processes. The personal experiences over two decades from failure analysis related to these organisms have indeed shown that manganese oxidizers may appear in all kinds of freshwater systems. This paper summarizes observations and conclusions drawn from these cases and provides an overview on the methods found useful in their investigation. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005769/abstract [article] Twenty years of experience with corrosion failures caused by manganese oxidizing microorganisms [texte imprimé] / P. Linhardt, Auteur . - 2011 . - pp. 1034–1039. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 12 (Décembre 2010) . - pp. 1034–1039 Mots-clés : Case histories  manganese oxidizing microorganisms  microbially influenced corrosion Résumé : Manganese oxidizing microorganisms are known as ubiquitous species in soil and fresh water. Their ability to extract dissolved manganese even at minute concentrations from the water and to biomineralize it as manganese(III/IV)oxides makes them potentially relevant for corrosion processes in technical systems carrying freshwater. These oxides are known as strong oxidants and may act as catalyst for the oxygen reduction reaction. Thus, they are cathodically active, possibly driving anodic metal dissolution processes. The personal experiences over two decades from failure analysis related to these organisms have indeed shown that manganese oxidizers may appear in all kinds of freshwater systems. This paper summarizes observations and conclusions drawn from these cases and provides an overview on the methods found useful in their investigation. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005769/abstract

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