Dépouillements

Correlation between electrochemical impedance and current distribution of carbon steel under organic coating / D. Kong in Materials and corrosion, Vol. 63 N° 6 (Juin 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 475–480 Titre : Correlation between electrochemical impedance and current distribution of carbon steel under organic coating Type de document : texte imprimé Auteurs : D. Kong, Auteur ; Y. Wang, Auteur ; W. Zhang, Auteur Année de publication : 2012 Article en page(s) : pp. 475–480 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Current  distribution;  EIS;  organic  coating;  wire  beam  electrode Résumé : The current distribution of carbon steel beneath intact organic coating exposed to 3.5% NaCl solution was investigated by the wire beam electrode (WBE) method. The electrochemical impedance spectroscopy (EIS) of individual electrodes with high current was characterized to analyze the behavior of the coating degradation and metal corrosion at coating/metal interface. The polarity switch of the electrode under the coating was observed. The mechanism of coating degradation and carbon steel substrate corrosion was discussed from a point of electrochemical distribution. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006035/abstract [article] Correlation between electrochemical impedance and current distribution of carbon steel under organic coating [texte imprimé] / D. Kong, Auteur ; Y. Wang, Auteur ; W. Zhang, Auteur . - 2012 . - pp. 475–480. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 475–480 Mots-clés : Current  distribution;  EIS;  organic  coating;  wire  beam  electrode Résumé : The current distribution of carbon steel beneath intact organic coating exposed to 3.5% NaCl solution was investigated by the wire beam electrode (WBE) method. The electrochemical impedance spectroscopy (EIS) of individual electrodes with high current was characterized to analyze the behavior of the coating degradation and metal corrosion at coating/metal interface. The polarity switch of the electrode under the coating was observed. The mechanism of coating degradation and carbon steel substrate corrosion was discussed from a point of electrochemical distribution. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006035/abstract

Transformation/dissolution studies on the release of iron and chromium from particles of alloys compared with their pure metals and selected metal oxides / Y. Hedberg in Materials and corrosion, Vol. 63 N° 6 (Juin 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 481–491 Titre : Transformation/dissolution studies on the release of iron and chromium from particles of alloys compared with their pure metals and selected metal oxides Type de document : texte imprimé Auteurs : Y. Hedberg, Auteur ; I. Odnevall Wallinder, Auteur Année de publication : 2012 Article en page(s) : pp. 481–491 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Ferrochromium  alloy;  hazard  assessment;  metal  particles;  metal  release;  transformation/dissolution Résumé : Transformation/dissolution (T/D) data for different Cr- and Fe-based alloys (a FeCr alloy, stainless steel AISI 316L, an alloy side product (SP) from stainless steel production) compared with their pure metals (Cr, Fe) and selected metal oxides (Cr2O3, Fe3O4) was generated and is used throughout the entire REACH assessment documentation of chromium metal and ferrochromium alloys to derive conclusions regarding their acute and chronic ecotoxicity hazard classification. Short and long term tests were conducted to assess data for acute and chronic aquatic toxicity following the recognized standardized T/D protocol. Tests were performed in media of different pH (pH 6.0 and pH 8.0), time periods, and solution composition, also investigating the effect of different experimental parameters. Generated data elucidates the complexity of the metal release process and its dependence on many interacting material-, surface-, and experimental factors as well as on the chemistry of the metal–water system being metal species specific. It is evident that the extent of metal release cannot be predicted by either the bulk or the surface composition, and that metal speciation measurements of released metals are essential to assess aquatic toxicity induced by metal/alloy particles. Observed released Fe and Cr concentrations were significantly lower than reported acute and chronic ecotoxicological endpoints. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005943/abstract [article] Transformation/dissolution studies on the release of iron and chromium from particles of alloys compared with their pure metals and selected metal oxides [texte imprimé] / Y. Hedberg, Auteur ; I. Odnevall Wallinder, Auteur . - 2012 . - pp. 481–491. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 481–491 Mots-clés : Ferrochromium  alloy;  hazard  assessment;  metal  particles;  metal  release;  transformation/dissolution Résumé : Transformation/dissolution (T/D) data for different Cr- and Fe-based alloys (a FeCr alloy, stainless steel AISI 316L, an alloy side product (SP) from stainless steel production) compared with their pure metals (Cr, Fe) and selected metal oxides (Cr2O3, Fe3O4) was generated and is used throughout the entire REACH assessment documentation of chromium metal and ferrochromium alloys to derive conclusions regarding their acute and chronic ecotoxicity hazard classification. Short and long term tests were conducted to assess data for acute and chronic aquatic toxicity following the recognized standardized T/D protocol. Tests were performed in media of different pH (pH 6.0 and pH 8.0), time periods, and solution composition, also investigating the effect of different experimental parameters. Generated data elucidates the complexity of the metal release process and its dependence on many interacting material-, surface-, and experimental factors as well as on the chemistry of the metal–water system being metal species specific. It is evident that the extent of metal release cannot be predicted by either the bulk or the surface composition, and that metal speciation measurements of released metals are essential to assess aquatic toxicity induced by metal/alloy particles. Observed released Fe and Cr concentrations were significantly lower than reported acute and chronic ecotoxicological endpoints. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005943/abstract

Electrochemical corrosion behaviour of Sn–Ag–Cu (SAC) eutectic alloy in a chloride containing environment / F. Rosalbino in Materials and corrosion, Vol. 63 N° 6 (Juin 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 492–496 Titre : Electrochemical corrosion behaviour of Sn–Ag–Cu (SAC) eutectic alloy in a chloride containing environment Type de document : texte imprimé Auteurs : F. Rosalbino, Auteur ; G. Zanicchi, Auteur ; R. Carlini, Auteur Année de publication : 2012 Article en page(s) : pp. 492–496 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Electrochemical  impedance  spectroscopy  (EIS);  NaCl  solution;  polarization  curves;  Sn–Ag–Cu  eutectic  alloy;  tin  oxy-chloride Résumé : The corrosion behaviour of the Sn94.5Ag3.8Cu1.5 (SAC) eutectic alloy was investigated in 0.1 M NaCl solution by potentiodynamic polarization and impedance spectroscopy measurements and compared with that of the conventional Sn73.9Pb23.1 eutectic solder employed for a long time in the packaging of microelectronic components and devices. Scanning electron microscopy (SEM) and electron probe microanalysis (EPMA) were used to characterize the SAC eutectic alloy prior to and after the electrochemical tests. The electrochemical results indicated that the Sn–Ag–Cu eutectic alloy exhibits better corrosion behaviour than the Sn–Pb eutectic solder in NaCl solution. The presence of a corrosion products layer constituted by tin oxy-chloride was detected at the surface of both alloys investigated after the electrochemical tests. The better corrosion behaviour of SAC eutectic alloy compared to Sn–Pb eutectic solder is ascribed to the formation of a more compact surface film of corrosion products with improved protective properties owing to the presence of copper and silver, as revealed by EPMA. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005979/abstract [article] Electrochemical corrosion behaviour of Sn–Ag–Cu (SAC) eutectic alloy in a chloride containing environment [texte imprimé] / F. Rosalbino, Auteur ; G. Zanicchi, Auteur ; R. Carlini, Auteur . - 2012 . - pp. 492–496. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 492–496 Mots-clés : Electrochemical  impedance  spectroscopy  (EIS);  NaCl  solution;  polarization  curves;  Sn–Ag–Cu  eutectic  alloy;  tin  oxy-chloride Résumé : The corrosion behaviour of the Sn94.5Ag3.8Cu1.5 (SAC) eutectic alloy was investigated in 0.1 M NaCl solution by potentiodynamic polarization and impedance spectroscopy measurements and compared with that of the conventional Sn73.9Pb23.1 eutectic solder employed for a long time in the packaging of microelectronic components and devices. Scanning electron microscopy (SEM) and electron probe microanalysis (EPMA) were used to characterize the SAC eutectic alloy prior to and after the electrochemical tests. The electrochemical results indicated that the Sn–Ag–Cu eutectic alloy exhibits better corrosion behaviour than the Sn–Pb eutectic solder in NaCl solution. The presence of a corrosion products layer constituted by tin oxy-chloride was detected at the surface of both alloys investigated after the electrochemical tests. The better corrosion behaviour of SAC eutectic alloy compared to Sn–Pb eutectic solder is ascribed to the formation of a more compact surface film of corrosion products with improved protective properties owing to the presence of copper and silver, as revealed by EPMA. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005979/abstract

The effect of Ca on corrosion behavior of heat-treated Mg–Al–Zn alloy / Y.-Q. Wang in Materials and corrosion, Vol. 63 N° 6 (Juin 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 497–504 Titre : The effect of Ca on corrosion behavior of heat-treated Mg–Al–Zn alloy Type de document : texte imprimé Auteurs : Y.-Q. Wang, Auteur ; M.-Z. Li, Auteur ; C. Li, Auteur Année de publication : 2012 Article en page(s) : pp. 497–504 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Ca;  corrosion;  magnesium  alloy;  microstructure Résumé : The effect of 0.5, 1.0, and 1.5 wt% Ca additions on the microstructure and corrosion resistance of the heat-treated Mg–Al–Zn alloy was investigated. Addition of 0.5 wt% Ca did not form any new phase but suppressed the discontinuous precipitation of the β-Mg17Al12 phase by being dissolved in both the second phase and magnesium matrix. In the materials containing higher amounts of Ca, however, metallographic investigation shows that Ca added to Mg–Al–Zn can obviously decrease the size of β-Mg17Al12 and forms Al4Ca intermetallic compounds in the shape of bone-like morphology. The corrosion tests used include constant immersion technique, and potentiodynamic polarization experiments and salt spray test. Surface examination and analytical studies were carried out using optical and scanning electron microscopy, EDX, and XRD. The results of corrosion tests show that magnesium alloy Mg–Al–Zn with 1.0 wt% Ca addition has the best corrosion resistance behavior. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005957/abstract [article] The effect of Ca on corrosion behavior of heat-treated Mg–Al–Zn alloy [texte imprimé] / Y.-Q. Wang, Auteur ; M.-Z. Li, Auteur ; C. Li, Auteur . - 2012 . - pp. 497–504. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 497–504 Mots-clés : Ca;  corrosion;  magnesium  alloy;  microstructure Résumé : The effect of 0.5, 1.0, and 1.5 wt% Ca additions on the microstructure and corrosion resistance of the heat-treated Mg–Al–Zn alloy was investigated. Addition of 0.5 wt% Ca did not form any new phase but suppressed the discontinuous precipitation of the β-Mg17Al12 phase by being dissolved in both the second phase and magnesium matrix. In the materials containing higher amounts of Ca, however, metallographic investigation shows that Ca added to Mg–Al–Zn can obviously decrease the size of β-Mg17Al12 and forms Al4Ca intermetallic compounds in the shape of bone-like morphology. The corrosion tests used include constant immersion technique, and potentiodynamic polarization experiments and salt spray test. Surface examination and analytical studies were carried out using optical and scanning electron microscopy, EDX, and XRD. The results of corrosion tests show that magnesium alloy Mg–Al–Zn with 1.0 wt% Ca addition has the best corrosion resistance behavior. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005957/abstract

Effect of alternating voltage treatment on corrosion resistance of AZ91D magnesium alloy / X. Liu in Materials and corrosion, Vol. 63 N° 6 (Juin 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 505–516 Titre : Effect of alternating voltage treatment on corrosion resistance of AZ91D magnesium alloy Type de document : texte imprimé Auteurs : X. Liu, Auteur ; T. Zhang, Auteur ; Y. Shao, Auteur Année de publication : 2012 Article en page(s) : pp. 505–516 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Corrosion;  electrochemical  techniques;  magnesium  alloy;  surface;  XPS Résumé : AZ91D magnesium alloy was treated by the alternating voltage (AV) treatment technique. The optimal AV-treatment parameters of the alloy were determined by orthogonal experiments. Polarization curve, electrochemical impedance spectroscopy (EIS), and scanning electrochemical microscopy (SECM) were used to understand the effect of AV-treatment on the corrosion resistance of the alloy. AFM, contact angle, and XPS were employed to investigate further the influence of AV-treatment on the properties of the surface film formed on the alloy after AV-treatment. The results showed that a uniform and stable film was formed and the corrosion resistance of AZ91D magnesium alloy was significantly improved after AV-treatment. This was caused by the noticeable change of the chemical structure and semi-conducting properties of the surface film after AV-treatment. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005999/abstract [article] Effect of alternating voltage treatment on corrosion resistance of AZ91D magnesium alloy [texte imprimé] / X. Liu, Auteur ; T. Zhang, Auteur ; Y. Shao, Auteur . - 2012 . - pp. 505–516. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 505–516 Mots-clés : Corrosion;  electrochemical  techniques;  magnesium  alloy;  surface;  XPS Résumé : AZ91D magnesium alloy was treated by the alternating voltage (AV) treatment technique. The optimal AV-treatment parameters of the alloy were determined by orthogonal experiments. Polarization curve, electrochemical impedance spectroscopy (EIS), and scanning electrochemical microscopy (SECM) were used to understand the effect of AV-treatment on the corrosion resistance of the alloy. AFM, contact angle, and XPS were employed to investigate further the influence of AV-treatment on the properties of the surface film formed on the alloy after AV-treatment. The results showed that a uniform and stable film was formed and the corrosion resistance of AZ91D magnesium alloy was significantly improved after AV-treatment. This was caused by the noticeable change of the chemical structure and semi-conducting properties of the surface film after AV-treatment. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005999/abstract

Corrosion behaviour of Cr13 steel in CO2 saturated brine with high chloride concentration / O. Yevtushenko in Materials and corrosion, Vol. 63 N° 6 (Juin 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 517–521 Titre : Corrosion behaviour of Cr13 steel in CO2 saturated brine with high chloride concentration Type de document : texte imprimé Auteurs : O. Yevtushenko, Auteur ; R. Bäßler, Auteur ; A. Pfennig, Auteur Année de publication : 2012 Article en page(s) : pp. 517–521 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Stainless  steel;  pitting  corrosion;  electrochemistry;  carbon  dioxide Résumé : The corrosion behaviour of martensitic stainless injection-pipeline steel X46Cr13 exposed to CO2 saturated artificial saline brine with high chloride concentration similar to onshore CCS-site at Ketzin, Germany has been investigated by means of electrochemical technique and microscopic observations at short exposure times (up to 24 h) and by mass loss and metallographic observations at exposure times up to 17520 h. Pitting corrosion kinetics has been characterised and the predictions about the corrosion mechanism are made. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005932/abstract [article] Corrosion behaviour of Cr13 steel in CO2 saturated brine with high chloride concentration [texte imprimé] / O. Yevtushenko, Auteur ; R. Bäßler, Auteur ; A. Pfennig, Auteur . - 2012 . - pp. 517–521. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 517–521 Mots-clés : Stainless  steel;  pitting  corrosion;  electrochemistry;  carbon  dioxide Résumé : The corrosion behaviour of martensitic stainless injection-pipeline steel X46Cr13 exposed to CO2 saturated artificial saline brine with high chloride concentration similar to onshore CCS-site at Ketzin, Germany has been investigated by means of electrochemical technique and microscopic observations at short exposure times (up to 24 h) and by mass loss and metallographic observations at exposure times up to 17520 h. Pitting corrosion kinetics has been characterised and the predictions about the corrosion mechanism are made. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005932/abstract

Influence of heat treatments at 475 and 400 °C on the pitting corrosion resistance and sensitization of UNS S32750 and UNS S32760 superduplex stainless steels / S. S. M. Tavares in Materials and corrosion, Vol. 63 N° 6 (Juin 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 522–526 Titre : Influence of heat treatments at 475 and 400 °C on the pitting corrosion resistance and sensitization of UNS S32750 and UNS S32760 superduplex stainless steels Type de document : texte imprimé Auteurs : S. S. M. Tavares, Auteur ; A. Loureiro, Auteur ; J. M. Pardal, Auteur Année de publication : 2012 Article en page(s) : pp. 522–526 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Low  temperature  aging;  pitting  corrosion;  superduplex  stainless  steel Résumé : Some precipitation reactions of superduplex stainless steels (SDSS) can improve hardness, yield, and ultimate strength, but with substantial decrease of corrosion resistance. One of these reactions is the spinodal decomposition of ferrite into Cr-rich fine precipitates (α′) and Cr-depleted matrix during low temperature aging. In this work, the effect of the α′ precipitation on the pitting corrosion resistance was investigated. The results showed that short duration heat treatments at 475 °C do not decrease the pitting corrosion resistance, but increase the hardness of UNS S32750 and S32760 SDSS. The limits of heat treatment duration for both steels were determined. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006016/abstract [article] Influence of heat treatments at 475 and 400 °C on the pitting corrosion resistance and sensitization of UNS S32750 and UNS S32760 superduplex stainless steels [texte imprimé] / S. S. M. Tavares, Auteur ; A. Loureiro, Auteur ; J. M. Pardal, Auteur . - 2012 . - pp. 522–526. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 522–526 Mots-clés : Low  temperature  aging;  pitting  corrosion;  superduplex  stainless  steel Résumé : Some precipitation reactions of superduplex stainless steels (SDSS) can improve hardness, yield, and ultimate strength, but with substantial decrease of corrosion resistance. One of these reactions is the spinodal decomposition of ferrite into Cr-rich fine precipitates (α′) and Cr-depleted matrix during low temperature aging. In this work, the effect of the α′ precipitation on the pitting corrosion resistance was investigated. The results showed that short duration heat treatments at 475 °C do not decrease the pitting corrosion resistance, but increase the hardness of UNS S32750 and S32760 SDSS. The limits of heat treatment duration for both steels were determined. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006016/abstract

Corrosion behaviour in physiological fluids of surface films formed on titanium alloys / J. C. Mirza Rosca in Materials and corrosion, Vol. 63 N° 6 (Juin 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 527–533 Titre : Corrosion behaviour in physiological fluids of surface films formed on titanium alloys Type de document : texte imprimé Auteurs : J. C. Mirza Rosca, Auteur ; E. Vasilescu, Auteur ; P. Drob, Auteur Année de publication : 2012 Article en page(s) : pp. 527–533 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Chemical  and  heat  treatments;  EIS;  microhardness;  open  circuit  potentials Résumé : The properties of the surface films formed on Ti and its Ti–5Al–4V and Ti–6Al–3.5Fe alloys by chemical (immersion in 10 M NaOH) and thermal treatment (500 °C) were studied in this paper. Their corrosion behaviour in Ringer solution was investigated. After treatments, the sample microhardness was measured. Also, the sample surfaces were observed by an optical microscope before and after immersion in Ringer solutions. The electrochemical behaviour of the surface films obtained by the chemical and thermal treatments was studied using the methods of the electrochemical impedance spectroscopy (EIS) and monitoring of open circuit potentials at different immersion periods (up to 60 days) in Ringer solution. Microhardness increased with the increasing loads for the studied materials, showing the existence of a compact protective layer. Microscopic observations exhibited more compact coatings after 60 days of exposure in Ringer solution, due to the formation of an apatite layer. EIS spectra revealed surface films with two layers: an inner, barrier protective layer and an outer, porous apatite layer. The impedance increases in time denoting that the films have grown by apatite nucleation. Also, EIS spectra showed that the complex treatment by chemical + heat method is the most efficiently. For the samples treated by the two processes (chemical + heat) the values of the open circuit potentials are nobler than of the chemical treated samples, denoting better protective, bioactive films. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106102/abstract [article] Corrosion behaviour in physiological fluids of surface films formed on titanium alloys [texte imprimé] / J. C. Mirza Rosca, Auteur ; E. Vasilescu, Auteur ; P. Drob, Auteur . - 2012 . - pp. 527–533. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 527–533 Mots-clés : Chemical  and  heat  treatments;  EIS;  microhardness;  open  circuit  potentials Résumé : The properties of the surface films formed on Ti and its Ti–5Al–4V and Ti–6Al–3.5Fe alloys by chemical (immersion in 10 M NaOH) and thermal treatment (500 °C) were studied in this paper. Their corrosion behaviour in Ringer solution was investigated. After treatments, the sample microhardness was measured. Also, the sample surfaces were observed by an optical microscope before and after immersion in Ringer solutions. The electrochemical behaviour of the surface films obtained by the chemical and thermal treatments was studied using the methods of the electrochemical impedance spectroscopy (EIS) and monitoring of open circuit potentials at different immersion periods (up to 60 days) in Ringer solution. Microhardness increased with the increasing loads for the studied materials, showing the existence of a compact protective layer. Microscopic observations exhibited more compact coatings after 60 days of exposure in Ringer solution, due to the formation of an apatite layer. EIS spectra revealed surface films with two layers: an inner, barrier protective layer and an outer, porous apatite layer. The impedance increases in time denoting that the films have grown by apatite nucleation. Also, EIS spectra showed that the complex treatment by chemical + heat method is the most efficiently. For the samples treated by the two processes (chemical + heat) the values of the open circuit potentials are nobler than of the chemical treated samples, denoting better protective, bioactive films. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106102/abstract

Study of criterion for assuring the effectiveness of cathodic protection of buried steel pipelines being interfered with alternative current / X. He in Materials and corrosion, Vol. 63 N° 6 (Juin 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 534–543 Titre : Study of criterion for assuring the effectiveness of cathodic protection of buried steel pipelines being interfered with alternative current Type de document : texte imprimé Auteurs : X. He, Auteur ; G. Jiang, Auteur ; Y. Qiu, Auteur Année de publication : 2012 Article en page(s) : pp. 534–543 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : AC  corrosion;  buried  pipeline;  cathodic  protection;  criterion Résumé : Interference of alternative current (AC) on corrosion of X65 steel was investigated in soil. It was observed that the unfavorable effect of interfering AC was able to be effectively inhibited by increasing the direct current density of the cathodic protection (CP) system. A clear correlation was established between the CP current density and the tolerable AC current density. This led to a new criterion for assuring the effectiveness of CP of buried pipelines being interfered with AC. Field experimental results on a buried pipeline running below a 500 kV transmission line showed that the criterion could satisfactorily predict the risk of AC interfering on the CP system. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006036/abstract [article] Study of criterion for assuring the effectiveness of cathodic protection of buried steel pipelines being interfered with alternative current [texte imprimé] / X. He, Auteur ; G. Jiang, Auteur ; Y. Qiu, Auteur . - 2012 . - pp. 534–543. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 534–543 Mots-clés : AC  corrosion;  buried  pipeline;  cathodic  protection;  criterion Résumé : Interference of alternative current (AC) on corrosion of X65 steel was investigated in soil. It was observed that the unfavorable effect of interfering AC was able to be effectively inhibited by increasing the direct current density of the cathodic protection (CP) system. A clear correlation was established between the CP current density and the tolerable AC current density. This led to a new criterion for assuring the effectiveness of CP of buried pipelines being interfered with AC. Field experimental results on a buried pipeline running below a 500 kV transmission line showed that the criterion could satisfactorily predict the risk of AC interfering on the CP system. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006036/abstract

Electrochemical investigations on corrosion protection oils / G. Eich in Materials and corrosion, Vol. 63 N° 6 (Juin 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 544–548 Titre : Electrochemical investigations on corrosion protection oils Type de document : texte imprimé Auteurs : G. Eich, Auteur ; J. Schneider, Auteur ; J. Zimmermann, Auteur Année de publication : 2012 Article en page(s) : pp. 544–548 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Corrosion  preventive  oil;  corrosion  test;  electrochemical  impedance  spectroscopy;  inhibitor;  neutral  salt  spray  test Résumé : Tribologically affected surfaces of high-strength steels often only may be protected against corrosion by the use of specific protecting oils. The protective effectiveness of these products is usually assessed by neutral salt spray test during qualification. As this test method takes a long time and because the reproducibility is poor a new test method was developed based on electrochemistry. It could be shown that a distinction was possible between well and nonprotecting oils based on current density curves and electrochemical impedance spectroscopy. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005882/abstract [article] Electrochemical investigations on corrosion protection oils [texte imprimé] / G. Eich, Auteur ; J. Schneider, Auteur ; J. Zimmermann, Auteur . - 2012 . - pp. 544–548. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 6 (Juin 2012) . - pp. 544–548 Mots-clés : Corrosion  preventive  oil;  corrosion  test;  electrochemical  impedance  spectroscopy;  inhibitor;  neutral  salt  spray  test Résumé : Tribologically affected surfaces of high-strength steels often only may be protected against corrosion by the use of specific protecting oils. The protective effectiveness of these products is usually assessed by neutral salt spray test during qualification. As this test method takes a long time and because the reproducibility is poor a new test method was developed based on electrochemistry. It could be shown that a distinction was possible between well and nonprotecting oils based on current density curves and electrochemical impedance spectroscopy. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005882/abstract

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