Dépouillements

The effect of absorbed hydrogen on the corrosion behavior of sintered NdFeB magnet / Yang, H. in Materials and corrosion, Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 4 (Avril 2012) . - pp. 292–296 Titre : The effect of absorbed hydrogen on the corrosion behavior of sintered NdFeB magnet Type de document : texte imprimé Auteurs : Yang, H., Auteur ; S. Mao, Auteur ; Z. Song, Auteur Année de publication : 2012 Article en page(s) : pp. 292–296 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Cathodic  hydrogen  charging;  corrosion  resistance;  exfoliation  corrosion;  hydrogen  absorption;  NdFeB  magnet Résumé : The absorption of hydrogen by NdFeB magnet has been investigated by using the electrochemical charging technique at constant cathodic current density Ic ranging from 0 to 4 mA/cm2. Open circuit potential measurements (OCP) and polarization curves were carried out to study the corrosion behavior of the charged NdFeB magnet in 0.01 mol/L NaCl solution. The results showed that hydrogen had a strong influence on the corrosion of NdFeB magnet. The open circuit potential became gradually negative due to the hydrogen incorporation into the NdFeB magnet. The corrosion resistance was reduced gradually with the increasing cathodic current density Ic. The surface structure and the morphology of the charged NdFeB magnet were examined by XRD and SEM. The results revealed that the effect of the absorbed hydrogen focused mostly on accelerating the exfoliation corrosion of Nd2Fe14B matrix grain. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005956/abstract [article] The effect of absorbed hydrogen on the corrosion behavior of sintered NdFeB magnet [texte imprimé] / Yang, H., Auteur ; S. Mao, Auteur ; Z. Song, Auteur . - 2012 . - pp. 292–296. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 4 (Avril 2012) . - pp. 292–296 Mots-clés : Cathodic  hydrogen  charging;  corrosion  resistance;  exfoliation  corrosion;  hydrogen  absorption;  NdFeB  magnet Résumé : The absorption of hydrogen by NdFeB magnet has been investigated by using the electrochemical charging technique at constant cathodic current density Ic ranging from 0 to 4 mA/cm2. Open circuit potential measurements (OCP) and polarization curves were carried out to study the corrosion behavior of the charged NdFeB magnet in 0.01 mol/L NaCl solution. The results showed that hydrogen had a strong influence on the corrosion of NdFeB magnet. The open circuit potential became gradually negative due to the hydrogen incorporation into the NdFeB magnet. The corrosion resistance was reduced gradually with the increasing cathodic current density Ic. The surface structure and the morphology of the charged NdFeB magnet were examined by XRD and SEM. The results revealed that the effect of the absorbed hydrogen focused mostly on accelerating the exfoliation corrosion of Nd2Fe14B matrix grain. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005956/abstract

Guideline for an assessment of electrochemical noise measurement devices / S. Ritter in Materials and corrosion, Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 4 (Avril 2012) . - pp. 297–302 Titre : Guideline for an assessment of electrochemical noise measurement devices Type de document : texte imprimé Auteurs : S. Ritter, Auteur ; F. Huet, Auteur ; R. A. Cottis, Auteur Année de publication : 2012 Article en page(s) : pp. 297–302 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Corrosion  monitoring;  dummy  cell;  electrochemical  noise;  guideline;  measurement  equipment Résumé : Pro-active ageing management is becoming more and more important for the economical and safe operation of industrial plants. A key element for a pro-active ageing management approach is to apply in situ corrosion monitoring. The electrochemical noise (EN) technique is an example of a promising method, especially for monitoring localised corrosion phenomena. Currently, research work on the EN technique is carried out in several laboratories worldwide for different kind of industrial applications but also for the investigation of corrosion mechanisms. A prerequisite for performing serious research on the EN measurement technique is a careful evaluation of the measuring system, even if commercially available EN measurement instruments are used. Therefore, testing on well-defined dummy cells should always be a preliminary step to assess the baseline noise of the EN measurement equipment and to ensure data validity. For this purpose a guideline has been developed by the European Cooperative Group on Corrosion Monitoring of Nuclear Materials (ECG-COMON 1) as an outcome from round-robin testing on EN. The current guideline describes a simple procedure for the performance and evaluation of EN measurement equipment using dummy cells. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005839/abstract [article] Guideline for an assessment of electrochemical noise measurement devices [texte imprimé] / S. Ritter, Auteur ; F. Huet, Auteur ; R. A. Cottis, Auteur . - 2012 . - pp. 297–302. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 4 (Avril 2012) . - pp. 297–302 Mots-clés : Corrosion  monitoring;  dummy  cell;  electrochemical  noise;  guideline;  measurement  equipment Résumé : Pro-active ageing management is becoming more and more important for the economical and safe operation of industrial plants. A key element for a pro-active ageing management approach is to apply in situ corrosion monitoring. The electrochemical noise (EN) technique is an example of a promising method, especially for monitoring localised corrosion phenomena. Currently, research work on the EN technique is carried out in several laboratories worldwide for different kind of industrial applications but also for the investigation of corrosion mechanisms. A prerequisite for performing serious research on the EN measurement technique is a careful evaluation of the measuring system, even if commercially available EN measurement instruments are used. Therefore, testing on well-defined dummy cells should always be a preliminary step to assess the baseline noise of the EN measurement equipment and to ensure data validity. For this purpose a guideline has been developed by the European Cooperative Group on Corrosion Monitoring of Nuclear Materials (ECG-COMON 1) as an outcome from round-robin testing on EN. The current guideline describes a simple procedure for the performance and evaluation of EN measurement equipment using dummy cells. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005839/abstract

Study on hot corrosion behavior of Yb2Zr2O7 ceramic against Na2SO4+V2O5molten salts at temperatures of 900-1200 °C en air / Li, S. in Materials and corrosion, Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 4 (Avril 2012) . - pp. 303–309 Titre : Study on hot corrosion behavior of Yb2Zr2O7 ceramic against Na2SO4+V2O5molten salts at temperatures of 900-1200 °C en air Type de document : texte imprimé Auteurs : Li, S., Auteur ; Z.-G. Liu, Auteur ; J.-H. Ouyang, Auteur Année de publication : 2012 Article en page(s) : pp. 303–309 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : fluxing  mechanism;  hot  corrosion;  Na2SO4;  V2O5;  Yb2Zr2O7 Résumé : Yb2Zr2O7 ceramic powders synthesized by chemical-coprecipitation and calcination method were pressureless-sintered at 1700 °C for 10 h in air to fabricate dense bulk materials. Hot corrosion studies were performed on Yb2Zr2O7 against Na2SO4 and Na2SO4 + V2O5 (molar ratio = 1:1) molten salts in a temperature range of 900–1200 °C for 8 h in air, respectively. Chemical reactions were investigated using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The Yb2Zr2O7 ceramic was severely corroded by Na2SO4 + V2O5 molten salt, however, no chemical reaction was found between individual Na2SO4 and Yb2Zr2O7. Yb2Zr2O7 reacted with Na2SO4 + V2O5 molten salt to form YbVO4 and m-ZrO2. The thickness of hot corrosion scales formed at different temperatures was investigated to evaluate hot corrosion behavior based on fluxing mechanism. The introduction of vanadium into sulfate led to subsequent formation of NaVO3, which was acidic enough to dissolve Yb2Zr2O7 by acidic fluxing. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005779/abstract [article] Study on hot corrosion behavior of Yb2Zr2O7 ceramic against Na2SO4+V2O5molten salts at temperatures of 900-1200 °C en air [texte imprimé] / Li, S., Auteur ; Z.-G. Liu, Auteur ; J.-H. Ouyang, Auteur . - 2012 . - pp. 303–309. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 4 (Avril 2012) . - pp. 303–309 Mots-clés : fluxing  mechanism;  hot  corrosion;  Na2SO4;  V2O5;  Yb2Zr2O7 Résumé : Yb2Zr2O7 ceramic powders synthesized by chemical-coprecipitation and calcination method were pressureless-sintered at 1700 °C for 10 h in air to fabricate dense bulk materials. Hot corrosion studies were performed on Yb2Zr2O7 against Na2SO4 and Na2SO4 + V2O5 (molar ratio = 1:1) molten salts in a temperature range of 900–1200 °C for 8 h in air, respectively. Chemical reactions were investigated using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The Yb2Zr2O7 ceramic was severely corroded by Na2SO4 + V2O5 molten salt, however, no chemical reaction was found between individual Na2SO4 and Yb2Zr2O7. Yb2Zr2O7 reacted with Na2SO4 + V2O5 molten salt to form YbVO4 and m-ZrO2. The thickness of hot corrosion scales formed at different temperatures was investigated to evaluate hot corrosion behavior based on fluxing mechanism. The introduction of vanadium into sulfate led to subsequent formation of NaVO3, which was acidic enough to dissolve Yb2Zr2O7 by acidic fluxing. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005779/abstract

Corrosion rate of construction materials in hot phosphoric acid with the contribution of anodic polarization / M. Kouril in Materials and corrosion, Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 4 (Avril 2012) . - pp. 310–316 Titre : Corrosion rate of construction materials in hot phosphoric acid with the contribution of anodic polarization Type de document : texte imprimé Auteurs : M. Kouril, Auteur ; E. Christensen, Auteur ; S. Eriksen, Auteur Année de publication : 2012 Article en page(s) : pp. 310–316 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Anodic  polarization;  mass  loss;  niobium;  phosphoric  acid;  silicon  carbide;  stainless  steel;  tantalum  coating;  titanium;  water  electrolyser Résumé : The paper is focused on selection of a proper material for construction elements of water electrolysers, which make use of a 85% phosphoric acid as an electrolyte at temperature of 150 °C and which might be loaded with anodic polarization up to 2.5 V versus a saturated Ag/AgCl electrode (SSCE). Several grades of stainless steels were tested as well as tantalum, niobium, titanium, nickel alloys and silicon carbide. The corrosion rate was evaluated by means of mass loss at free corrosion potential as well as under various levels of polarization. The only corrosion resistant material in 85% phosphoric acid at 150 °C and at polarization of 2.5 V/SSCE is tantalum. In that case, even a gentle cathodic polarization is harmful in such an acidic environment. Hydrogen reduction leads to tantalum hydride formation, to loss of mechanical properties and to complete disintegration of the metal. Contrary to tantalum, titanium is free of any corrosion resistance in hot phosphoric acid. Its corrosion rate ranges from tens of millimetres to metres per year depending on temperature of the acid. Alloy bonded tantalum coating was recognized as an effective corrosion protection for both titanium and stainless steel. Its serviceability might be limited by slow dissolution of tantalum that is in order of units of mm/year. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006021/abstract [article] Corrosion rate of construction materials in hot phosphoric acid with the contribution of anodic polarization [texte imprimé] / M. Kouril, Auteur ; E. Christensen, Auteur ; S. Eriksen, Auteur . - 2012 . - pp. 310–316. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 4 (Avril 2012) . - pp. 310–316 Mots-clés : Anodic  polarization;  mass  loss;  niobium;  phosphoric  acid;  silicon  carbide;  stainless  steel;  tantalum  coating;  titanium;  water  electrolyser Résumé : The paper is focused on selection of a proper material for construction elements of water electrolysers, which make use of a 85% phosphoric acid as an electrolyte at temperature of 150 °C and which might be loaded with anodic polarization up to 2.5 V versus a saturated Ag/AgCl electrode (SSCE). Several grades of stainless steels were tested as well as tantalum, niobium, titanium, nickel alloys and silicon carbide. The corrosion rate was evaluated by means of mass loss at free corrosion potential as well as under various levels of polarization. The only corrosion resistant material in 85% phosphoric acid at 150 °C and at polarization of 2.5 V/SSCE is tantalum. In that case, even a gentle cathodic polarization is harmful in such an acidic environment. Hydrogen reduction leads to tantalum hydride formation, to loss of mechanical properties and to complete disintegration of the metal. Contrary to tantalum, titanium is free of any corrosion resistance in hot phosphoric acid. Its corrosion rate ranges from tens of millimetres to metres per year depending on temperature of the acid. Alloy bonded tantalum coating was recognized as an effective corrosion protection for both titanium and stainless steel. Its serviceability might be limited by slow dissolution of tantalum that is in order of units of mm/year. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006021/abstract

Effect of sodium silicate pretreatment on phosphate layer: Morphology and corrosion resistance behavior / J. Wang in Materials and corrosion, Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 4 (Avril 2012) . - pp. 317–322 Titre : Effect of sodium silicate pretreatment on phosphate layer: Morphology and corrosion resistance behavior Type de document : texte imprimé Auteurs : J. Wang, Auteur ; W. Zhou, Auteur ; Y. Du, Auteur Année de publication : 2012 Article en page(s) : pp. 317–322 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Phosphating;  pretreatment;  sodium  silicate Résumé : Phosphating is a widely adopted treatment in industry for many purposes. In this paper, carbon steel was pretreated with sodium silicate before phosphating. X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical measurements were used to evaluate the pretreatment effect by sodium silicate on the phosphating layer. The results demonstrate that the phosphate layer pretreated by sodium silicate has a better corrosion resistance as compared with the un-pretreated ones. More compact and uniform coatings composed of finer crystals were obtained with the pretreatment of sodium silicate. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005742/abstract [article] Effect of sodium silicate pretreatment on phosphate layer: Morphology and corrosion resistance behavior [texte imprimé] / J. Wang, Auteur ; W. Zhou, Auteur ; Y. Du, Auteur . - 2012 . - pp. 317–322. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 4 (Avril 2012) . - pp. 317–322 Mots-clés : Phosphating;  pretreatment;  sodium  silicate Résumé : Phosphating is a widely adopted treatment in industry for many purposes. In this paper, carbon steel was pretreated with sodium silicate before phosphating. X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical measurements were used to evaluate the pretreatment effect by sodium silicate on the phosphating layer. The results demonstrate that the phosphate layer pretreated by sodium silicate has a better corrosion resistance as compared with the un-pretreated ones. More compact and uniform coatings composed of finer crystals were obtained with the pretreatment of sodium silicate. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005742/abstract

Oxidation of tungstate-containing green rust (Cl–) in aqueous solution / K. Shinoda in Materials and corrosion, Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 4 (Avril 2012) . - pp. 343–349 Titre : Oxidation of tungstate-containing green rust (Cl–) in aqueous solution Type de document : texte imprimé Auteurs : K. Shinoda, Auteur ; S. Fujieda, Auteur ; S. Tsuri, Auteur Année de publication : 2012 Article en page(s) : pp. 343–349 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Green  rust;  iron  oxyhydroxide;  tungstate;  oxidation;  X-ray  diffraction;  X-ray  absorption  spectroscopy Résumé : The influence of tungstate on the oxidation of green rust [GR(Cl–)], which contains both Fe(II) and Fe(III), was investigated by synthesizing suspensions of GR(Cl–) containing tungstate and oxidizing them via injection of N2 gas containing O2. XRD and TEM analyses were used for characterizing the solid particles formed during synthesis and oxidation. The results showed that the formation of fine α-FeOOH was enhanced by the addition of tungstate to the GR(Cl–) suspensions, while GR(Cl–) without tungstate was transformed primarily into γ-FeOOH. The pH, oxidation-reduction potential (ORP), and dissolved oxygen (DO) values of the aqueous solution were measured during oxidation of GR(Cl–) with and without tungstate. The results showed that whereas the pH value of the solution was decreased and the ORP value was increased monotonically by oxidation of GR(Cl–), the pH and ORP values during oxidation the GR(Cl–) suspension containing tungstate revealed characteristic changes with time. XAS was also used for characterizing the chemical state and local structure of tungstate in the oxidized particles. The results indicated that the local structure of WOmath image was essentially retained in the particles precipitated from GR(Cl–) suspensions. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005922/abstract [article] Oxidation of tungstate-containing green rust (Cl–) in aqueous solution [texte imprimé] / K. Shinoda, Auteur ; S. Fujieda, Auteur ; S. Tsuri, Auteur . - 2012 . - pp. 343–349. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 4 (Avril 2012) . - pp. 343–349 Mots-clés : Green  rust;  iron  oxyhydroxide;  tungstate;  oxidation;  X-ray  diffraction;  X-ray  absorption  spectroscopy Résumé : The influence of tungstate on the oxidation of green rust [GR(Cl–)], which contains both Fe(II) and Fe(III), was investigated by synthesizing suspensions of GR(Cl–) containing tungstate and oxidizing them via injection of N2 gas containing O2. XRD and TEM analyses were used for characterizing the solid particles formed during synthesis and oxidation. The results showed that the formation of fine α-FeOOH was enhanced by the addition of tungstate to the GR(Cl–) suspensions, while GR(Cl–) without tungstate was transformed primarily into γ-FeOOH. The pH, oxidation-reduction potential (ORP), and dissolved oxygen (DO) values of the aqueous solution were measured during oxidation of GR(Cl–) with and without tungstate. The results showed that whereas the pH value of the solution was decreased and the ORP value was increased monotonically by oxidation of GR(Cl–), the pH and ORP values during oxidation the GR(Cl–) suspension containing tungstate revealed characteristic changes with time. XAS was also used for characterizing the chemical state and local structure of tungstate in the oxidized particles. The results indicated that the local structure of WOmath image was essentially retained in the particles precipitated from GR(Cl–) suspensions. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005922/abstract

A study on the 65-35 brass corrosion inhibitor / C. Liang in Materials and corrosion, Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 4 (Avril 2012) . - pp. 350–354 Titre : A study on the 65-35 brass corrosion inhibitor Type de document : texte imprimé Auteurs : C. Liang, Auteur ; G. Gao, Auteur ; B. Wu, Auteur Année de publication : 2012 Article en page(s) : pp. 350–354 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Corrosion;  inhibitor;  brass;  potentiostatic Résumé : The influence of new inhibitor namely 1,3-bis-diethylamino-propan-2-ol (DEAP) on the dezincification corrosion of 65-35 brass in simulated atmospheric water was studied by potentiostatic current transient measurement, solution analysis and surface evaluation techniques. Potentiostatic current transient results showed that the investigated inhibitor can effectively inhibit the chemical dissolution of brass in simulated atmospheric water. Solution analysis revealed that the weigh loss of brass electrode remarkably decreased in the presence of DEAP, changing from 7.375 × 10−3 mg (blank) to 9.567 × 10−4 mg (10−2  M). The scanning electron microscope (SEM) and electron probe microanalyzer (EPMA) measurements showed that DEAP may better adsorb to zinc component than to copper component, inhibiting the dezincification of brass in solution by a mixed complex film of Zn(II)-DEAP and Cu(I)-DEAP. The nature of the inhibited film was analyzed by an X-ray photoelectron spectroscope (XPS) analyzer. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005795/abstract [article] A study on the 65-35 brass corrosion inhibitor [texte imprimé] / C. Liang, Auteur ; G. Gao, Auteur ; B. Wu, Auteur . - 2012 . - pp. 350–354. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 4 (Avril 2012) . - pp. 350–354 Mots-clés : Corrosion;  inhibitor;  brass;  potentiostatic Résumé : The influence of new inhibitor namely 1,3-bis-diethylamino-propan-2-ol (DEAP) on the dezincification corrosion of 65-35 brass in simulated atmospheric water was studied by potentiostatic current transient measurement, solution analysis and surface evaluation techniques. Potentiostatic current transient results showed that the investigated inhibitor can effectively inhibit the chemical dissolution of brass in simulated atmospheric water. Solution analysis revealed that the weigh loss of brass electrode remarkably decreased in the presence of DEAP, changing from 7.375 × 10−3 mg (blank) to 9.567 × 10−4 mg (10−2  M). The scanning electron microscope (SEM) and electron probe microanalyzer (EPMA) measurements showed that DEAP may better adsorb to zinc component than to copper component, inhibiting the dezincification of brass in solution by a mixed complex film of Zn(II)-DEAP and Cu(I)-DEAP. The nature of the inhibited film was analyzed by an X-ray photoelectron spectroscope (XPS) analyzer. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005795/abstract

Corrosion behavior of SRB Desulfobulbus propionicus isolated from an Indian petroleum refinery on mild steel / B. Anandkumar in Materials and corrosion, Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 4 (Avril 2012) . - pp. 355–362 Titre : Corrosion behavior of SRB Desulfobulbus propionicus isolated from an Indian petroleum refinery on mild steel Type de document : texte imprimé Auteurs : B. Anandkumar, Auteur ; R. P. George, Auteur ; S. Maruthamuthu, Auteur Année de publication : 2012 Article en page(s) : pp. 355–362 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Microbiological  corrosion;  mild  steel;  polarization;  weight  loss;  X-ray  diffraction Résumé : In this study, Desulfobulbus propionicus (D. propionicus), a sulfate reducing bacterium (SRB) was isolated and identified in cooling towers by molecular biologic techniques. This bacterial species has been reported for the first time in the cooling towers of an Indian petroleum refinery. Corrosion behaviors were analyzed by electrochemical and weight loss methods. The high corrosion rate and the enhancement of anodic current in increased chloride environment was noticed in the presence of D. propionicus indicating that this SRB species enhances the pitting corrosion of mild steel. Propionate metabolism in H2S production is discussed as a new pathway of corrosion enhancement. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005883/abstract [article] Corrosion behavior of SRB Desulfobulbus propionicus isolated from an Indian petroleum refinery on mild steel [texte imprimé] / B. Anandkumar, Auteur ; R. P. George, Auteur ; S. Maruthamuthu, Auteur . - 2012 . - pp. 355–362. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 4 (Avril 2012) . - pp. 355–362 Mots-clés : Microbiological  corrosion;  mild  steel;  polarization;  weight  loss;  X-ray  diffraction Résumé : In this study, Desulfobulbus propionicus (D. propionicus), a sulfate reducing bacterium (SRB) was isolated and identified in cooling towers by molecular biologic techniques. This bacterial species has been reported for the first time in the cooling towers of an Indian petroleum refinery. Corrosion behaviors were analyzed by electrochemical and weight loss methods. The high corrosion rate and the enhancement of anodic current in increased chloride environment was noticed in the presence of D. propionicus indicating that this SRB species enhances the pitting corrosion of mild steel. Propionate metabolism in H2S production is discussed as a new pathway of corrosion enhancement. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005883/abstract

Exemplaires

Bibliothèque Ecole Nationale Polytechnique d'Alger

Accueil

Se connecter

Météo

Adresse