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Biocorrosion of AISI 304 stainless steel by desulfovibrio desulfuricans in seawater / Thi My Phuc Nguyen in Industrial & engineering chemistry research, Vol. 47 n°14 (Juillet 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4703-4711 Titre : Biocorrosion of AISI 304 stainless steel by desulfovibrio desulfuricans in seawater Type de document : texte imprimé Auteurs : Thi My Phuc Nguyen, Auteur ; Xiaoxia Sheng, Auteur ; Yen-Peng Ting, Auteur ; Simo Olavi Pehkonen, Auteur Année de publication : 2008 Article en page(s) : p. 4703-4711 Note générale : Bibliogr. p. 4710-4711 Langues : Anglais (eng) Mots-clés : AISI  304  stainless  steel;  Analytical  techniques;  Polarization  resistance Résumé : The corrosion behavior of AISI 304 stainless steel (SS304) in a batch system of enriched artificial seawater (EASW) in the presence of a sulfate-reducing bacteria (SRB) species (Desulfovibrio desulfuricans ATCC 27774) was investigated using analytical techniques including electrochemical impedance spectroscopy (EIS), atomic force microscopy (AFM), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). EIS analysis showed that the polarization resistance of SS304 decreased after immersion in EASW in the presence of the SRB for 14 days compared to the control sample (in the absence of SRB). The corrosion processes were simulated using equivalent circuit models, which provided electrochemical information on the liquid/surface interface for both abiotic and biotic systems. Using AFM, pits and cracks were observed on the stainless steel surface in the presence of SRB, and a thick biofilm produced by SRB was evident in SEM micrographs, which corroborated the EIS results for the explanation of the biocorrosion mechanism. XPS analysis showed changes in the chemical states at the near-surface environment and on the surface of stainless steel. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071468e [article] Biocorrosion of AISI 304 stainless steel by desulfovibrio desulfuricans in seawater [texte imprimé] / Thi My Phuc Nguyen, Auteur ; Xiaoxia Sheng, Auteur ; Yen-Peng Ting, Auteur ; Simo Olavi Pehkonen, Auteur . - 2008 . - p. 4703-4711. Bibliogr. p. 4710-4711 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4703-4711 Mots-clés : AISI  304  stainless  steel;  Analytical  techniques;  Polarization  resistance Résumé : The corrosion behavior of AISI 304 stainless steel (SS304) in a batch system of enriched artificial seawater (EASW) in the presence of a sulfate-reducing bacteria (SRB) species (Desulfovibrio desulfuricans ATCC 27774) was investigated using analytical techniques including electrochemical impedance spectroscopy (EIS), atomic force microscopy (AFM), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). EIS analysis showed that the polarization resistance of SS304 decreased after immersion in EASW in the presence of the SRB for 14 days compared to the control sample (in the absence of SRB). The corrosion processes were simulated using equivalent circuit models, which provided electrochemical information on the liquid/surface interface for both abiotic and biotic systems. Using AFM, pits and cracks were observed on the stainless steel surface in the presence of SRB, and a thick biofilm produced by SRB was evident in SEM micrographs, which corroborated the EIS results for the explanation of the biocorrosion mechanism. XPS analysis showed changes in the chemical states at the near-surface environment and on the surface of stainless steel. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071468e

Electrochemical behavior of serratia marcescens ACE2 on carbon steel API 5L-X60 in organic/aqueous phase / Aruliah Rajasekar in Industrial & engineering chemistry research, Vol. 47 N°18 (Septembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°18 (Septembre 2008) . - p. 6925–6932 Titre : Electrochemical behavior of serratia marcescens ACE2 on carbon steel API 5L-X60 in organic/aqueous phase Type de document : texte imprimé Auteurs : Aruliah Rajasekar, Auteur ; Sundaram Maruthamuthu, Auteur ; Yen-Peng Ting, Auteur Année de publication : 2008 Article en page(s) : p. 6925–6932 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Carbon  steel  API  5L-X60  Diesel-water  systems  Serratia  marcescens  ACE2  Electrochemical  impedance  spectroscopy Résumé : The present study reports on the role of the bacterium Serratia marcescens ACE2 in the corrosion behavior of carbon steel API 5L-X60 in diesel−water systems. The effect of commercial corrosion inhibitor (CI) on the growth of strain ACE2 and its corrosion inhibition efficiency was investigated. The corrosion rate was evaluated using electrochemical impedance spectroscopy (EIS) and polarization techniques in the diesel−water interface systems. The amine and carboxylic acid based inhibitor gave better efficiency in the absence of strain ACE2 by suppression of both anodic and cathodic reactions. In the presence of the strain ACE2, the inhibitor suppressed the cathodic reaction more significantly than the anodic reaction. The electrochemical behavior of steel API 5L-X60 was correlated with the role of the adsorbed amine based compound and degraded product on the metal surface. The surface morphology of the coupons in the presence/absence of the inhibitor with ACE2 was observed by using atomic force microscopy (AFM) and revealed pitting corrosion. This basic study is useful for the development of new approaches for the detection, monitoring, and control of microbial corrosion in a petroleum product pipeline. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8005935 [article] Electrochemical behavior of serratia marcescens ACE2 on carbon steel API 5L-X60 in organic/aqueous phase [texte imprimé] / Aruliah Rajasekar, Auteur ; Sundaram Maruthamuthu, Auteur ; Yen-Peng Ting, Auteur . - 2008 . - p. 6925–6932. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°18 (Septembre 2008) . - p. 6925–6932 Mots-clés : Carbon  steel  API  5L-X60  Diesel-water  systems  Serratia  marcescens  ACE2  Electrochemical  impedance  spectroscopy Résumé : The present study reports on the role of the bacterium Serratia marcescens ACE2 in the corrosion behavior of carbon steel API 5L-X60 in diesel−water systems. The effect of commercial corrosion inhibitor (CI) on the growth of strain ACE2 and its corrosion inhibition efficiency was investigated. The corrosion rate was evaluated using electrochemical impedance spectroscopy (EIS) and polarization techniques in the diesel−water interface systems. The amine and carboxylic acid based inhibitor gave better efficiency in the absence of strain ACE2 by suppression of both anodic and cathodic reactions. In the presence of the strain ACE2, the inhibitor suppressed the cathodic reaction more significantly than the anodic reaction. The electrochemical behavior of steel API 5L-X60 was correlated with the role of the adsorbed amine based compound and degraded product on the metal surface. The surface morphology of the coupons in the presence/absence of the inhibitor with ACE2 was observed by using atomic force microscopy (AFM) and revealed pitting corrosion. This basic study is useful for the development of new approaches for the detection, monitoring, and control of microbial corrosion in a petroleum product pipeline. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8005935

Microbial Corrosion of aluminum 2024 aeronautical alloy by hydrocarbon degrading bacteria bacillus cereus ACE4 and serratia marcescens ACE2 / Aruliah Rajasekar in Industrial & engineering chemistry research, Vol. 49 N° 13 (Juillet 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 13 (Juillet 2010) . - pp. 6054-6061 Titre : Microbial Corrosion of aluminum 2024 aeronautical alloy by hydrocarbon degrading bacteria bacillus cereus ACE4 and serratia marcescens ACE2 Type de document : texte imprimé Auteurs : Aruliah Rajasekar, Auteur ; Yen-Peng Ting, Auteur Année de publication : 2010 Article en page(s) : pp. 6054-6061 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Bacteria  Corrosion Résumé : Microbial growth and contamination in aviation fuel storage tanks and aircraft wing tanks cause metal corrosion plugging of the fuel filter, and increased maintenance costs associated with these problems. This paper report the microbiologically induced corrosion (MIC) and electrochemical behavior of aluminum alloy (AA 2024 in the presence of hydrocarbon-degrading bacteria Bacillus cereus ACE4 (a Gram-positive bacteria) and Serrati marcescens ACE2 (a Gram-negative bacteria). Electrochemical impedance spectroscopy and metallographic analysis of the metal AA 2024 exposed to a simulated fuel tank environment showed that the bacteria caused pitting corrosion. Scanning electron microscopy-energy-dispersive X-ray spectroscopy analysis (SEM-EDAX) atomic force microscopy (AFM), and Fourier-transform infrared spectroscopy (FTIR) analyses of the aluminum alloy coupons with bacterial biofilm developed after exposure to minimal salt medium confirmed tha extracellular polymeric substances accumulate with exposure time and revealed that biofilms are formed as microcolonies, which subsequently cause pitting corrosion. Hydrophobicity of the cell surface was examined using bacterial adhesion to hydrocarbons (BATH) assay. The hydrophobicity and emulsification index of B cereus ACE4 grown in n-hexadecane containing medium was higher (86% and E72 85%) than that of S marcescens ACE2 (60% and E72 75%), This significant difference may be due to the efficiency of biosurfactan production, which contributes to increase in the cell surface hydrophobicity of the B. cereus ACE4, and enhanced bacterial adhesion on the AA 2024 metal surface. The corrosion damage caused by B. cereus ACE4 is vigorous compared with that from S. marcescens ACE2. This study provides some insight into the MIC of AA 2024 by two hydrocarbon-degrading bacteria in fuel/water mixtures. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=22974424 [article] Microbial Corrosion of aluminum 2024 aeronautical alloy by hydrocarbon degrading bacteria bacillus cereus ACE4 and serratia marcescens ACE2 [texte imprimé] / Aruliah Rajasekar, Auteur ; Yen-Peng Ting, Auteur . - 2010 . - pp. 6054-6061. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 13 (Juillet 2010) . - pp. 6054-6061 Mots-clés : Bacteria  Corrosion Résumé : Microbial growth and contamination in aviation fuel storage tanks and aircraft wing tanks cause metal corrosion plugging of the fuel filter, and increased maintenance costs associated with these problems. This paper report the microbiologically induced corrosion (MIC) and electrochemical behavior of aluminum alloy (AA 2024 in the presence of hydrocarbon-degrading bacteria Bacillus cereus ACE4 (a Gram-positive bacteria) and Serrati marcescens ACE2 (a Gram-negative bacteria). Electrochemical impedance spectroscopy and metallographic analysis of the metal AA 2024 exposed to a simulated fuel tank environment showed that the bacteria caused pitting corrosion. Scanning electron microscopy-energy-dispersive X-ray spectroscopy analysis (SEM-EDAX) atomic force microscopy (AFM), and Fourier-transform infrared spectroscopy (FTIR) analyses of the aluminum alloy coupons with bacterial biofilm developed after exposure to minimal salt medium confirmed tha extracellular polymeric substances accumulate with exposure time and revealed that biofilms are formed as microcolonies, which subsequently cause pitting corrosion. Hydrophobicity of the cell surface was examined using bacterial adhesion to hydrocarbons (BATH) assay. The hydrophobicity and emulsification index of B cereus ACE4 grown in n-hexadecane containing medium was higher (86% and E72 85%) than that of S marcescens ACE2 (60% and E72 75%), This significant difference may be due to the efficiency of biosurfactan production, which contributes to increase in the cell surface hydrophobicity of the B. cereus ACE4, and enhanced bacterial adhesion on the AA 2024 metal surface. The corrosion damage caused by B. cereus ACE4 is vigorous compared with that from S. marcescens ACE2. This study provides some insight into the MIC of AA 2024 by two hydrocarbon-degrading bacteria in fuel/water mixtures. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=22974424

Role of inorganic and organic medium in the corrosion behavior of bacillus megaterium and pseudomonas sp. in stainless steel SS 304 / Aruliah Rajasekar in Industrial & engineering chemistry research, Vol. 50 N° 22 (Novembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 22 (Novembre 2011) . - pp. 12534-12541 Titre : Role of inorganic and organic medium in the corrosion behavior of bacillus megaterium and pseudomonas sp. in stainless steel SS 304 Type de document : texte imprimé Auteurs : Aruliah Rajasekar, Auteur ; Yen-Peng Ting, Auteur Année de publication : 2012 Article en page(s) : pp. 12534-12541 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Bacteria  Pseudomonadales  Pseudomonadaceae  Stainless  steel  Pseudomonas  Corrosion Résumé : The production of extracellular polysaccharides (EPS) forms a layer on a metal surface that may either inhibit or accelerate corrosion. In the present study, the biocorrosion behavior of stainless steel 304 in the presence of aerobic bacteria Bacillus megaterium and Pseudomonas sp. was investigated in different growth media; an inorganic medium and an organic medium with 3.5% sodium chloride as the electrolyte. Biocorrosion was evaluated using potentiodynamic anodic and cathodic polarization, electrochemical impedance spectroscopy (EIS), scanning electron microscopy-energy dispersive spectrum analysis (SEM-EDAX), and Fourier transform infrared spectroscopy (FTIR). The corrosion potential (Ecorr) and pitting potential (Epit) were lower in the presence of both bacteria in the inorganic medium when compared to the organic medium. The inorganic medium consisted of inorganic nitrates and phosphates which accelerated the production of bacterial metabolites and enhanced corrosion resistance through the formation of a passive layer which inhibited the corrosion. Exposure of the metal in organic medium however caused both bacteria to shift the corrosion potential (Ecorr) toward the negative direction, thus causing the metal to undergo severe pitting attack. Electrochemical measurements showed that both the bacteria enhanced pitting corrosion in the organic medium. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24745727 [article] Role of inorganic and organic medium in the corrosion behavior of bacillus megaterium and pseudomonas sp. in stainless steel SS 304 [texte imprimé] / Aruliah Rajasekar, Auteur ; Yen-Peng Ting, Auteur . - 2012 . - pp. 12534-12541. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 22 (Novembre 2011) . - pp. 12534-12541 Mots-clés : Bacteria  Pseudomonadales  Pseudomonadaceae  Stainless  steel  Pseudomonas  Corrosion Résumé : The production of extracellular polysaccharides (EPS) forms a layer on a metal surface that may either inhibit or accelerate corrosion. In the present study, the biocorrosion behavior of stainless steel 304 in the presence of aerobic bacteria Bacillus megaterium and Pseudomonas sp. was investigated in different growth media; an inorganic medium and an organic medium with 3.5% sodium chloride as the electrolyte. Biocorrosion was evaluated using potentiodynamic anodic and cathodic polarization, electrochemical impedance spectroscopy (EIS), scanning electron microscopy-energy dispersive spectrum analysis (SEM-EDAX), and Fourier transform infrared spectroscopy (FTIR). The corrosion potential (Ecorr) and pitting potential (Epit) were lower in the presence of both bacteria in the inorganic medium when compared to the organic medium. The inorganic medium consisted of inorganic nitrates and phosphates which accelerated the production of bacterial metabolites and enhanced corrosion resistance through the formation of a passive layer which inhibited the corrosion. Exposure of the metal in organic medium however caused both bacteria to shift the corrosion potential (Ecorr) toward the negative direction, thus causing the metal to undergo severe pitting attack. Electrochemical measurements showed that both the bacteria enhanced pitting corrosion in the organic medium. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24745727