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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 hydrocarbon degrading bacteria serratia marcescens ACE2 and bacillus cereus ACE4 on corrosion of carbon steel API 5LX / Aruliah Rajasekar in Industrial & engineering chemistry research, Vol. 50 N° 17 (Septembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 17 (Septembre 2011) . - pp. 10041–10046 Titre : Role of hydrocarbon degrading bacteria serratia marcescens ACE2 and bacillus cereus ACE4 on corrosion of carbon steel API 5LX Type de document : texte imprimé Auteurs : Aruliah Rajasekar, Auteur ; Rajasekhar Balasubramanian, Auteur ; Joshua VM Kuma, Auteur Année de publication : 2011 Article en page(s) : pp. 10041–10046 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Corrosion  Carbon  Steel Résumé : This paper reports the microbiologically induced corrosion (MIC) and electrochemical behavior of carbon steel (API 5LX) in the presence of hydrocarbon-degrading bacteria Bacillus cereus ACE4 (a Gram-positive bacterium) and Serratia marcescens ACE2 (a Gram-negative bacterium). Weight loss studies and metallographic analysis of the metal API 5LX exposed to a simulated corrosive environment showed that the bacterium ACE4 caused severe pitting corrosion than that of bacterium ACE2. As part of biodegradation studies, the impact of aryl hydrocarbon hydroxylase (AHH) on diesel degradation was investigated along with reduction of total hydrocarbons. It was clearly observed that, during the biodegradation experiment in the presence of B. cereus ACE4, the content of the total hydrocarbons decreased significantly due to their metabolism induced by AHH enzymes when compared to S. marcescens ACE2. Degraded petroleum hydrocarbons (diesel) act as a good nutrient for bacteria, which in turn increases the proliferation of bacteria on the steel and determines the nature of corrosion. Metal oxides such as MnO2 and Fe2O3 were found as part of the corrosion products, indicating that the ACE4 bacterium is capable of converting the elements on the carbon steel (API 5LX) to their metal oxides and thus accelerating severe pitting corrosion on the surface of the pipeline networks. Overall, the study provides an insight into the microbiologically influenced corrosion of carbon steel API 5LX by two hydrocarbon-degrading bacteria in diesel fuel/water mixtures. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200709q [article] Role of hydrocarbon degrading bacteria serratia marcescens ACE2 and bacillus cereus ACE4 on corrosion of carbon steel API 5LX [texte imprimé] / Aruliah Rajasekar, Auteur ; Rajasekhar Balasubramanian, Auteur ; Joshua VM Kuma, Auteur . - 2011 . - pp. 10041–10046. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 17 (Septembre 2011) . - pp. 10041–10046 Mots-clés : Corrosion  Carbon  Steel Résumé : This paper reports the microbiologically induced corrosion (MIC) and electrochemical behavior of carbon steel (API 5LX) in the presence of hydrocarbon-degrading bacteria Bacillus cereus ACE4 (a Gram-positive bacterium) and Serratia marcescens ACE2 (a Gram-negative bacterium). Weight loss studies and metallographic analysis of the metal API 5LX exposed to a simulated corrosive environment showed that the bacterium ACE4 caused severe pitting corrosion than that of bacterium ACE2. As part of biodegradation studies, the impact of aryl hydrocarbon hydroxylase (AHH) on diesel degradation was investigated along with reduction of total hydrocarbons. It was clearly observed that, during the biodegradation experiment in the presence of B. cereus ACE4, the content of the total hydrocarbons decreased significantly due to their metabolism induced by AHH enzymes when compared to S. marcescens ACE2. Degraded petroleum hydrocarbons (diesel) act as a good nutrient for bacteria, which in turn increases the proliferation of bacteria on the steel and determines the nature of corrosion. Metal oxides such as MnO2 and Fe2O3 were found as part of the corrosion products, indicating that the ACE4 bacterium is capable of converting the elements on the carbon steel (API 5LX) to their metal oxides and thus accelerating severe pitting corrosion on the surface of the pipeline networks. Overall, the study provides an insight into the microbiologically influenced corrosion of carbon steel API 5LX by two hydrocarbon-degrading bacteria in diesel fuel/water mixtures. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200709q

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