1-Effect of cathodic protection on corrosive activity of sulphide-producing bacteria
PINEAU Samuel - LEFEVRE Yves - DUPONT Isabelle CORRODYS, Centre de corrosion marine et biologique – 55 rue de Beuzeville, BP9, 50120 Equeurdreville
2 - Biodeterioration of a cement induced by thiobacilli
I. Dupont (1), A. Poisson (1), C. Dagbert (2), G. Nouail (3), J. Galland (2)
(1) Corrodys, Centre for marine et Biological corrosion, 55 rue de Beuzeville, 50120 Equeurdreville, France
(2) "Corrosion-Fragilisation-Hydrogen" laboratory - Ecole Centrale Paris - 92295 Chatenay Malabry - France
(3) Center of Research and Development – SAINT-GOBAIN PAM - 54704 Pont à Mousson France
Abstract
Cement mortars are prone to biodegradation. The in-laboratory-performed work has for objectives to reproduce and accelerate the phenomena of biodegradation of the cements observed in service, but also to master the experimental conditions for improving the reproducibility. The biologic process leading to the deterioration result often from bacteria Thiobacilli metabolism : first, there are reduction of sulfates (SO42-) to sulfides (S2-) then the oxidization of the produced sulfides in sulfuric acid (H2SO4). The result show that during laboratory woks, bacteria actions is strongly depending of H2S gas flow and the aggressive of environment could be inhibited if the bacteria activity is not maintained. SEM investigations performed on cement cubes after the tests permit to appreciate in a better way the interactions between bacteria and cement mortar.
Keywords : biodegradation, cement, Thiobacilli,
3 – Delphine Bermond-Tilly(1), Isabelle Dupont-Morral (1), Monique Janvier (2)
1 : Corrodys, Centre de Corrosion marine et Biologique, 55 rue de Beuzeville, 50120 Equeurdreville, France
2 : Unité Biodiversité des Bactéries Pathogènes Emergentes, Institut Pasteur, 28 rue du Dr. Roux 75015 Paris, France.
4 – V. L’Hostis (1), C. Dagbert (1), J. Galland (1), I. Dupont (2), M. Roy (3), D. Féron (3)
(1): Laboratoire « Corrosion – Fragilisation – Hydrogène », Ecole Centrale Paris,92295 Chatenay-Malabry Cedex
(2): Corrodys, Centre de Corrosion marine et Biologique, 55 rue de Beuzeville, 50120 Equeurdreville
(3): Laboratoire d’Etude de la Corrosion Aqueuse, CEA Saclay, 91191 Gif sur Yvette Cedex
5 -Interrelationship between cathodic protection and microbiologically influenced corrosion in marine environment: Brief-review and prospects
DUPONT Isabelle, PINEAU Samuel, BRAISAZ Thierry
ABSTRACT
Cathodic protection is widely used to prevent corrosion of steel constructions exposed to seawater. This protection causes a calcareous deposit as well as a biofilm formation. The Sulphate-Reducing Bacteria (SRB) and Thiosulphate-Reducing Bacteria (TRB) are involved in the steel biodegradation phenomena in marine environment. The surface colonization by these species under cathodic protection are described particularly for the TRB and with immersion periods of over 30 days. After a brief-review, preliminary studies explain the first results of our investigation in natural seawater and carbon steel during 4 to 8 weeks experiment. We have made experiments with natural strains of SRB/TRB, with monoculture of Desulfovibrio halophilus (SRB) and Dethiosulfovibrio peptidovorans (TRB), with potential a Cathodic Protection (CP) of –900 mV/SCE and –1000 mV/SCE and without CP. These results seem indicate that the effects of CP on the sulphide-producing bacteria metabolism is the reduction of their corrosive activity.
6 – C. Amiel (1), I. Dupont (2), A. Poisson (2), L. Mariey (1), D. Barillier (1)
(1) : Laboratoire de physico-chimie et Biotechnologies, IUT-UFR Sciences,
boulevard Maréchal Juin, 14032 Caen cedex, France
(2) : Corrodys, Centre de Corrosion marine et Biologique, 55 rue de Beuzeville, France
Publications :
C. Rubio, C. Amiel, A. Poisson, I.Dupont, L.Mariey Caractérisation de la flore sulfato / thiosulfato réductrice par spectroscopie infrarouge à transformée de Fourier (IRTF). Matériaux & Techniques (en presse)
C. Rubio, C. Ott, C. Amiel, I. Dupont-Moral, J. Travert, L. Mariey (2006)
Sulfato/thiosulfato reducing bacteria characterization by FT-IR
spectroscopy, a new approach to biocorrosion control. Journal of
Microbiological Methods. vol 64 pages 287-296.
Oral presentations :
Céline Rubio, C. Amiel, A. Poisson, I. Dupont-Moral, L.Mariey Caractérisation de la flore sulfato / thiosulfato réductrice par spectroscopie infra-rouge à transformée de Fourier (IRTF) Cefracor 2003, La Rochelle
Posters :
Céline Rubio, C. Amiel, A. Poisson, I. Dupont-Moral, L.Mariey Caractérisation de la flore sulfato / thiosulfato réductrice par spectroscopie infra-rouge à transformée de Fourier (IRTF) Cefracor 2003, La Rochelle
Ott C., Amiel C., Poisson A., Bermond-Tilly D.,Dupont-Morral I., Mariey L. Caractérisation de la flore sulfurogène présente en milieu marin par spectroscopie Infra-Rouge à Transformée de Fourier (IRTF) VIéme congrés de la SFM, mai 2004, Bordeaux
Ott C., Amiel C., Poisson A., Bermond-Tilly D.,Dupont-Morral I., Mariey L. Marine sulfurogen flora characterisation by FT-IR spectroscopy 12th congress RINA, July 2004, Southampton
Ott C., Amiel C., Poisson A., Bermond-Tilly D.,Dupont-Morral I., Mariey L. Marine sulfurogen flora characterisation by FT-IR spectroscopy Eurocorr, septembre 2004, Nice
