Dépouillements

High-temperature oxidation behaviour of model CoReCr alloys at low oxygen partial pressure / B. Gorr in Materials and corrosion, Vol. 61 N° 9 (Septembre 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 9 (Septembre 2010) . - pp. 741–747 Titre : High-temperature oxidation behaviour of model CoReCr alloys at low oxygen partial pressure Type de document : texte imprimé Auteurs : B. Gorr, Auteur ; S. Burk, Auteur ; V. B. Trindade, Auteur Année de publication : 2011 Article en page(s) : pp. 741–747 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Cr2O3-scale;  high-temperature  oxidation;  thermodynamic  calculation Résumé : The oxidation behaviour of four model Co-Re-Cr alloys and a commercial Co-based alloy was investigated at 1000 °C and a low-oxygen partial pressure of p(O2) = 10−16 bar, in order to prove the feasibility of a pre-oxidation treatment. Under suitable conditions of the pre-oxidation treatment, the oxidation of the highly reactive alloying element Cr is possible. All the studied alloys form a continuous and dense Cr2O3 scale on the metal surface. The transport of chromium to the surface occurs mainly from the Cr-rich σ-phase, which becomes completely dissolved in the surrounding matrix after long exposure times. As a result of the Cr2O3 scale, growth depletion of Cr occurs in the near surface region, leading to internal oxidation. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905412/abstract [article] High-temperature oxidation behaviour of model CoReCr alloys at low oxygen partial pressure [texte imprimé] / B. Gorr, Auteur ; S. Burk, Auteur ; V. B. Trindade, Auteur . - 2011 . - pp. 741–747. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 9 (Septembre 2010) . - pp. 741–747 Mots-clés : Cr2O3-scale;  high-temperature  oxidation;  thermodynamic  calculation Résumé : The oxidation behaviour of four model Co-Re-Cr alloys and a commercial Co-based alloy was investigated at 1000 °C and a low-oxygen partial pressure of p(O2) = 10−16 bar, in order to prove the feasibility of a pre-oxidation treatment. Under suitable conditions of the pre-oxidation treatment, the oxidation of the highly reactive alloying element Cr is possible. All the studied alloys form a continuous and dense Cr2O3 scale on the metal surface. The transport of chromium to the surface occurs mainly from the Cr-rich σ-phase, which becomes completely dissolved in the surrounding matrix after long exposure times. As a result of the Cr2O3 scale, growth depletion of Cr occurs in the near surface region, leading to internal oxidation. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905412/abstract

Effect of grain refinement on corrosion of ferritic–martensitic steels in supercritical water environment / X. Ren in Materials and corrosion, Vol. 61 N° 9 (Septembre 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 9 (Septembre 2010) . - pp. 748–755 Titre : Effect of grain refinement on corrosion of ferritic–martensitic steels in supercritical water environment Type de document : texte imprimé Auteurs : X. Ren, Auteur ; Sridharan, K., Auteur ; T. R. Allen, Auteur Année de publication : 2011 Article en page(s) : pp. 748–755 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Ferritic–martensitic  steels Résumé : The effects of grain refinement on the corrosion behavior of three ferritic–martensitic (F/M) steels, HT9, T91, and NF616, and two binary model alloys Fe-15%Cr and Fe-18%Cr in supercritical water (SCW) have been investigated. Grain refinement down to a size of about one micron in the surface regions, was achieved by introducing severe plastic deformation by shot peening. After exposure to SCW with 25 ppb oxygen at 500 °C for up to 3000 h, an improvement in corrosion resistance was observed in grain-refined samples because of the enhanced diffusion of chromium on the surface, through a high density of grain boundaries. The chromium content in the steels and the exposure durations in SCW were determined to be important factors influencing the efficacy of the grain refinement effects. These results are supported by both experimental evidence and theoretical predictions. Another approach for grain refinement, equal channel angular pressing (ECAP), was also investigated for T91 steel. ECAP resulted in lower weight gain due to corrosion compared to the untreated samples, but exhibited a slightly higher weight gain compared to the shot-peened samples after long-term exposures in SCW which is probably caused by different fractions of high-angle grain boundaries in grain-refined regions, introduced by different grain refinement techniques. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905446/abstract [article] Effect of grain refinement on corrosion of ferritic–martensitic steels in supercritical water environment [texte imprimé] / X. Ren, Auteur ; Sridharan, K., Auteur ; T. R. Allen, Auteur . - 2011 . - pp. 748–755. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 9 (Septembre 2010) . - pp. 748–755 Mots-clés : Ferritic–martensitic  steels Résumé : The effects of grain refinement on the corrosion behavior of three ferritic–martensitic (F/M) steels, HT9, T91, and NF616, and two binary model alloys Fe-15%Cr and Fe-18%Cr in supercritical water (SCW) have been investigated. Grain refinement down to a size of about one micron in the surface regions, was achieved by introducing severe plastic deformation by shot peening. After exposure to SCW with 25 ppb oxygen at 500 °C for up to 3000 h, an improvement in corrosion resistance was observed in grain-refined samples because of the enhanced diffusion of chromium on the surface, through a high density of grain boundaries. The chromium content in the steels and the exposure durations in SCW were determined to be important factors influencing the efficacy of the grain refinement effects. These results are supported by both experimental evidence and theoretical predictions. Another approach for grain refinement, equal channel angular pressing (ECAP), was also investigated for T91 steel. ECAP resulted in lower weight gain due to corrosion compared to the untreated samples, but exhibited a slightly higher weight gain compared to the shot-peened samples after long-term exposures in SCW which is probably caused by different fractions of high-angle grain boundaries in grain-refined regions, introduced by different grain refinement techniques. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905446/abstract

Electrochemical corrosion behavior of X80 pipeline steel in a near-neutral pH solution / H. B. Xue in Materials and corrosion, Vol. 61 N° 9 (Septembre 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 9 (Septembre 2010) . - pp. 756–761 Titre : Electrochemical corrosion behavior of X80 pipeline steel in a near-neutral pH solution Type de document : texte imprimé Auteurs : H. B. Xue, Auteur ; Y. F. Cheng, Auteur Année de publication : 2011 Article en page(s) : pp. 756–761 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Corrosion;  electrochemical  impedance  spectroscopy;  near-neutral  pH  solution;  photo-electrochemical  measurement;  pipeline  steel Résumé : In this work, the electrochemical corrosion behavior of X80 pipeline steel was investigated in a near-neutral pH solution using electrochemical impedance spectroscopy (EIC) and photo-electrochemical (PEC) measurements as well as X-ray photo-electron spectroscopy (XPS) technique. The effects of hydrogen-charging and stress were considered. The results show that the steel is in an active dissolution state, and a layer of corrosion product is formed and deposited on the electrode surface, which is subjected to further oxidation to form ferric oxide and hydroxide. Photo-illumination enhances anodic dissolution of the steel when it is under anodic polarization due to destroying of the corrosion product film. When the steel is under cathodic polarization, the cathodic current density decreases upon laser illumination due to the photo-oxidation of hydrogen atoms generated during cathodic reactions, which behaves as an anodic reaction to offset the cathodic current density. Hydrogen-charging and stress decrease the corrosion resistance of the steel and enhance the dissolution rate of the steel. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905430/abstract [article] Electrochemical corrosion behavior of X80 pipeline steel in a near-neutral pH solution [texte imprimé] / H. B. Xue, Auteur ; Y. F. Cheng, Auteur . - 2011 . - pp. 756–761. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 9 (Septembre 2010) . - pp. 756–761 Mots-clés : Corrosion;  electrochemical  impedance  spectroscopy;  near-neutral  pH  solution;  photo-electrochemical  measurement;  pipeline  steel Résumé : In this work, the electrochemical corrosion behavior of X80 pipeline steel was investigated in a near-neutral pH solution using electrochemical impedance spectroscopy (EIC) and photo-electrochemical (PEC) measurements as well as X-ray photo-electron spectroscopy (XPS) technique. The effects of hydrogen-charging and stress were considered. The results show that the steel is in an active dissolution state, and a layer of corrosion product is formed and deposited on the electrode surface, which is subjected to further oxidation to form ferric oxide and hydroxide. Photo-illumination enhances anodic dissolution of the steel when it is under anodic polarization due to destroying of the corrosion product film. When the steel is under cathodic polarization, the cathodic current density decreases upon laser illumination due to the photo-oxidation of hydrogen atoms generated during cathodic reactions, which behaves as an anodic reaction to offset the cathodic current density. Hydrogen-charging and stress decrease the corrosion resistance of the steel and enhance the dissolution rate of the steel. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905430/abstract

Effects of SRB on cathodic protection of Q235 steel in soils / C. Sun in Materials and corrosion, Vol. 61 N° 9 (Septembre 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 9 (Septembre 2010) . - pp. 762–767 Titre : Effects of SRB on cathodic protection of Q235 steel in soils Type de document : texte imprimé Auteurs : C. Sun, Auteur ; J. Xu, Auteur ; F.H. Wang, Auteur Année de publication : 2011 Article en page(s) : pp. 762–767 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Cathodic  protection;Q235  steel;  soils;  SRB Résumé : The effects of sulfate reducing bacteria (SRB) on cathodic protection (CP) of the Q235 steel in the soils have been studied by bacterial analyses, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM) and energy-dispersive X-ray analysis (EDX). The results showed that the pH value of the soil around the steel gradually increased, the number of SRB and the corrosion rate of the steel decreased, and the CP efficiency increased with the increasing of applied cathodic potential. At the cathodic polarization potential of −1050 mV, SRB still survived in the soils. At the same potential, the CP efficiency in the soil without SRB was higher than that with SRB, and the corrosion rate of the steel in the soil with SRB was much higher than that without SRB. The cathodic current density applied for the steel in the soil with SRB was bigger than that without SRB at the same cathodic potential. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905339/abstract [article] Effects of SRB on cathodic protection of Q235 steel in soils [texte imprimé] / C. Sun, Auteur ; J. Xu, Auteur ; F.H. Wang, Auteur . - 2011 . - pp. 762–767. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 9 (Septembre 2010) . - pp. 762–767 Mots-clés : Cathodic  protection;Q235  steel;  soils;  SRB Résumé : The effects of sulfate reducing bacteria (SRB) on cathodic protection (CP) of the Q235 steel in the soils have been studied by bacterial analyses, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM) and energy-dispersive X-ray analysis (EDX). The results showed that the pH value of the soil around the steel gradually increased, the number of SRB and the corrosion rate of the steel decreased, and the CP efficiency increased with the increasing of applied cathodic potential. At the cathodic polarization potential of −1050 mV, SRB still survived in the soils. At the same potential, the CP efficiency in the soil without SRB was higher than that with SRB, and the corrosion rate of the steel in the soil with SRB was much higher than that without SRB. The cathodic current density applied for the steel in the soil with SRB was bigger than that without SRB at the same cathodic potential. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905339/abstract

Electrochemical aspects of Ti–Ta alloys in HBSS / D. Mareci in Materials and corrosion, Vol. 61 N° 9 (Septembre 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 9 (Septembre 2010) . - pp. 768–774 Titre : Electrochemical aspects of Ti–Ta alloys in HBSS Type de document : texte imprimé Auteurs : D. Mareci, Auteur ; R. Chelariu, Auteur ; G. Ciurescu, Auteur Année de publication : 2011 Article en page(s) : pp. 768–774 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Albumin  protein;  corrosion  resistance;  EIS;  potentiodynamic  polarization;  Ti–Ta  alloy Résumé : Corrosion behaviour of the studied Ti–Ta alloys with Ta contents of 30, 40 and 50 wt% together with the currently used metallic biomaterials commercial pure titanium (Cp–Ti) was investigated for biomedical applications. All the samples were tested by potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS) in Hank's balanced salt solution (HBSS) with and without albumin protein at 25 °C. Very low corrosion current densities and passive current densities (in the order of 10−6 A/cm2) were obtained from the polarization curves, indicating a typical passive behaviour for all the samples in HBSS with and without albumin. The EIS technique was applied to study the nature of the passive film formed on all the samples at various imposed potentials −500 mV (SCE), 0 mV (SCE), 500 mV (SCE) and 1000 mV (SCE). The equivalent circuit (EC) used successfully to describe the behaviour of the samples suggests a single passive film present on the metals' surface in HBSS with and without albumin. The results showed that the presence of albumin in HBSS had an influence on the zero current potential (ZCP), polarization resistance (Rp) and capacitance (C). The presence of albumin protein in HBSS improved slightly the corrosion resistance of the entire sample. The experimental results confirm that the electrochemical behaviour of the studied Ti–Ta alloys is better to that of Cp–Ti, suggesting their promising potential for biomedical applications. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905527/abstract [article] Electrochemical aspects of Ti–Ta alloys in HBSS [texte imprimé] / D. Mareci, Auteur ; R. Chelariu, Auteur ; G. Ciurescu, Auteur . - 2011 . - pp. 768–774. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 9 (Septembre 2010) . - pp. 768–774 Mots-clés : Albumin  protein;  corrosion  resistance;  EIS;  potentiodynamic  polarization;  Ti–Ta  alloy Résumé : Corrosion behaviour of the studied Ti–Ta alloys with Ta contents of 30, 40 and 50 wt% together with the currently used metallic biomaterials commercial pure titanium (Cp–Ti) was investigated for biomedical applications. All the samples were tested by potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS) in Hank's balanced salt solution (HBSS) with and without albumin protein at 25 °C. Very low corrosion current densities and passive current densities (in the order of 10−6 A/cm2) were obtained from the polarization curves, indicating a typical passive behaviour for all the samples in HBSS with and without albumin. The EIS technique was applied to study the nature of the passive film formed on all the samples at various imposed potentials −500 mV (SCE), 0 mV (SCE), 500 mV (SCE) and 1000 mV (SCE). The equivalent circuit (EC) used successfully to describe the behaviour of the samples suggests a single passive film present on the metals' surface in HBSS with and without albumin. The results showed that the presence of albumin in HBSS had an influence on the zero current potential (ZCP), polarization resistance (Rp) and capacitance (C). The presence of albumin protein in HBSS improved slightly the corrosion resistance of the entire sample. The experimental results confirm that the electrochemical behaviour of the studied Ti–Ta alloys is better to that of Cp–Ti, suggesting their promising potential for biomedical applications. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905527/abstract

Corrosion behaviour and biocompatibility of a new dental noble AuPdAgTi alloy / D. Raducanu in Materials and corrosion, Vol. 61 N° 9 (Septembre 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 9 (Septembre 2010) . - pp. 775–782 Titre : Corrosion behaviour and biocompatibility of a new dental noble AuPdAgTi alloy Type de document : texte imprimé Auteurs : D. Raducanu, Auteur ; A. Cimpean, Auteur ; E. Vasilescu, Auteur Année de publication : 2011 Article en page(s) : pp. 775–782 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Au-20Pd-10Ag-5Ti  alloy;  cell  adhesion;  corrosion  parameters;  morphology  and  proliferation Résumé : The aims of the study were to investigate the electrochemical response of a new dental Au-20Pd-10Ag-5Ti alloy in artificial Carter-Brugirard saliva and to assess its biocompatibility using gingival fibroblast culture. Electrochemical techniques of potentiodynamic and linear polarization were used. Also, the open circuit potentials and the corresponding open circuit potential gradients were monitored for 5000 exposure hours. The gingival fibroblast response to Au-20Pd-10Ag-5Ti alloy was estimated by LDH-cytotoxicity, MTT cell proliferation assays, the assessment of substrate-dependent changes in extracellular fibronectin network, cell morphology and actin cytoskeleton organization. The cyclic potentiodynamic curves of Au-20Pd-10Ag-5Ti alloy exhibited a passive behaviour with transpassive dissolution of silver, without pitting corrosion. Open circuit potentials were finally stable at noble values. Open circuit potential gradients have low values that could not generate galvanic or local corrosion. The new Au-20Pd-10Ag-5Ti alloy did not promote cell damage and alterations in cell adhesion and morphological features, exhibiting a good biocompatibility. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005636/abstract [article] Corrosion behaviour and biocompatibility of a new dental noble AuPdAgTi alloy [texte imprimé] / D. Raducanu, Auteur ; A. Cimpean, Auteur ; E. Vasilescu, Auteur . - 2011 . - pp. 775–782. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 9 (Septembre 2010) . - pp. 775–782 Mots-clés : Au-20Pd-10Ag-5Ti  alloy;  cell  adhesion;  corrosion  parameters;  morphology  and  proliferation Résumé : The aims of the study were to investigate the electrochemical response of a new dental Au-20Pd-10Ag-5Ti alloy in artificial Carter-Brugirard saliva and to assess its biocompatibility using gingival fibroblast culture. Electrochemical techniques of potentiodynamic and linear polarization were used. Also, the open circuit potentials and the corresponding open circuit potential gradients were monitored for 5000 exposure hours. The gingival fibroblast response to Au-20Pd-10Ag-5Ti alloy was estimated by LDH-cytotoxicity, MTT cell proliferation assays, the assessment of substrate-dependent changes in extracellular fibronectin network, cell morphology and actin cytoskeleton organization. The cyclic potentiodynamic curves of Au-20Pd-10Ag-5Ti alloy exhibited a passive behaviour with transpassive dissolution of silver, without pitting corrosion. Open circuit potentials were finally stable at noble values. Open circuit potential gradients have low values that could not generate galvanic or local corrosion. The new Au-20Pd-10Ag-5Ti alloy did not promote cell damage and alterations in cell adhesion and morphological features, exhibiting a good biocompatibility. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005636/abstract

EIS study on pitting corrosion of 7150 aluminum alloy in sodium chloride and hydrochloric acid solution / G. S. Peng in Materials and corrosion, Vol. 61 N° 9 (Septembre 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 9 (Septembre 2010) . - pp. 783–789 Titre : EIS study on pitting corrosion of 7150 aluminum alloy in sodium chloride and hydrochloric acid solution Type de document : texte imprimé Auteurs : G. S. Peng, Auteur ; K. H. Chen, Auteur ; H. C. Fang, Auteur Année de publication : 2011 Article en page(s) : pp. 783–789 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : 7150  aluminum  alloy;  EIS;  MgZn2;  original  oxide  layer;  pitting  corrosion Résumé : The pitting corrosion behavior of 7150 aluminum alloy was studied by electrochemical impedance spectroscopy (EIS) in the sodium chloride and hydrochloric acid solution. Based on EIS features and corrosion morphologies as well as corrosion potential, the process of pitting corrosion could be clearly divided into four stages: at the first stage, the Nyquist diagram was composed of two overlapping capacitive loops at the high-medial frequency and one inductive loop at the low frequency. At the second stage (metastable pits developing stage), there existed one small capacitive loop at the high frequency and one big capacitive loop at the medial frequency. At the third stage (stable pits developing stage), two time constants were more clearly distinguished, corresponding to two obvious capacitive loops. At the fourth stage, there appeared one capacitive loop, attributing to uniform corrosion. An equivalent circuit was designed to fit EIS, and the experimental results and the fitted results had good correspondence. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905413/abstract [article] EIS study on pitting corrosion of 7150 aluminum alloy in sodium chloride and hydrochloric acid solution [texte imprimé] / G. S. Peng, Auteur ; K. H. Chen, Auteur ; H. C. Fang, Auteur . - 2011 . - pp. 783–789. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 9 (Septembre 2010) . - pp. 783–789 Mots-clés : 7150  aluminum  alloy;  EIS;  MgZn2;  original  oxide  layer;  pitting  corrosion Résumé : The pitting corrosion behavior of 7150 aluminum alloy was studied by electrochemical impedance spectroscopy (EIS) in the sodium chloride and hydrochloric acid solution. Based on EIS features and corrosion morphologies as well as corrosion potential, the process of pitting corrosion could be clearly divided into four stages: at the first stage, the Nyquist diagram was composed of two overlapping capacitive loops at the high-medial frequency and one inductive loop at the low frequency. At the second stage (metastable pits developing stage), there existed one small capacitive loop at the high frequency and one big capacitive loop at the medial frequency. At the third stage (stable pits developing stage), two time constants were more clearly distinguished, corresponding to two obvious capacitive loops. At the fourth stage, there appeared one capacitive loop, attributing to uniform corrosion. An equivalent circuit was designed to fit EIS, and the experimental results and the fitted results had good correspondence. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905413/abstract

Electrochemical impedance spectroscopy investigation of chlorinated rubber-based coatings containing polyaniline as anticorrosion agent / A. F. Baldissera in Materials and corrosion, Vol. 61 N° 9 (Septembre 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 9 (Septembre 2010) . - pp. 790–801 Titre : Electrochemical impedance spectroscopy investigation of chlorinated rubber-based coatings containing polyaniline as anticorrosion agent Type de document : texte imprimé Auteurs : A. F. Baldissera, Auteur ; D. B. Freitas, Auteur ; C. A. Ferreira, Auteur Année de publication : 2011 Article en page(s) : pp. 790–801 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Chlorinated  rubber;  corrosion;  electrochemical  impedance  spectroscopy;  paint;  polyaniline Résumé : Corrosion protection of mild steel by a newly developed chlorinated rubber (CR)-based coating system containing the inherently conductive polymer polyaniline (PAni) as an anticorrosion agent was studied. The synthesis of PAni and preparation of CR-based paint containing this polymer are described herein. The corrosion behavior of mild steel samples coated with a CR resin, CR/PAni-EB (emeraldine base), CR/PAni-ES (emeraldine salt), and CR/DBSA-doped PAni were investigated in 3.5% NaCl solution. For this purpose, electrochemical impedance spectroscopy and corrosion potential versus time measurements were utilized. It was found that the addition of the two forms of PAni, doped and undoped, to the CR resin increased its corrosion protection efficiency. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905254/abstract [article] Electrochemical impedance spectroscopy investigation of chlorinated rubber-based coatings containing polyaniline as anticorrosion agent [texte imprimé] / A. F. Baldissera, Auteur ; D. B. Freitas, Auteur ; C. A. Ferreira, Auteur . - 2011 . - pp. 790–801. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 9 (Septembre 2010) . - pp. 790–801 Mots-clés : Chlorinated  rubber;  corrosion;  electrochemical  impedance  spectroscopy;  paint;  polyaniline Résumé : Corrosion protection of mild steel by a newly developed chlorinated rubber (CR)-based coating system containing the inherently conductive polymer polyaniline (PAni) as an anticorrosion agent was studied. The synthesis of PAni and preparation of CR-based paint containing this polymer are described herein. The corrosion behavior of mild steel samples coated with a CR resin, CR/PAni-EB (emeraldine base), CR/PAni-ES (emeraldine salt), and CR/DBSA-doped PAni were investigated in 3.5% NaCl solution. For this purpose, electrochemical impedance spectroscopy and corrosion potential versus time measurements were utilized. It was found that the addition of the two forms of PAni, doped and undoped, to the CR resin increased its corrosion protection efficiency. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905254/abstract

Influence of N,N′-dimethylaminoethanol as an inhibitor on the chloride threshold level for corrosion of steel reinforcement / J. Xu in Materials and corrosion, Vol. 61 N° 9 (Septembre 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 9 (Septembre 2010) . - pp. 802–809 Titre : Influence of N,N′-dimethylaminoethanol as an inhibitor on the chloride threshold level for corrosion of steel reinforcement Type de document : texte imprimé Auteurs : J. Xu, Auteur ; L. Jiang, Auteur ; F. Xing, Auteur Année de publication : 2011 Article en page(s) : pp. 802–809 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Chloride  threshold  level;  concrete;  inhibitor;  N,N′-dimethylaminoethanol;  steel  reinforcement Résumé : The aim of this study is to examine the influence of N,N′-dimethylaminoethanol (DMEA) as an inhibitor on the chloride threshold level for corrosion of steel in a concrete contaminated by chlorides. The experiment has been carried out in a saturated Ca(OH)2 solution and chloride contaminated concrete containing different chloride and DMEA level. The critical point of corrosion onset is concluded by combining the open-circuit potential (Ecorr) with corrosion current (Icorr), which is decided by electrochemical impedance spectra (EIS) in the solution. Besides, the EIS has also been applied to determinate the chloride threshold level in the chloride contaminated concrete. It has been found that the presence of DMEA represented as an amino-alcohol inhibitor, exerts little influence on the chloride threshold level for corrosion of steel in the solution. Similarly, the effect of the DMEA on the chloride threshold level in the chloride contaminated concrete, is also negligible. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905393/abstract [article] Influence of N,N′-dimethylaminoethanol as an inhibitor on the chloride threshold level for corrosion of steel reinforcement [texte imprimé] / J. Xu, Auteur ; L. Jiang, Auteur ; F. Xing, Auteur . - 2011 . - pp. 802–809. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 9 (Septembre 2010) . - pp. 802–809 Mots-clés : Chloride  threshold  level;  concrete;  inhibitor;  N,N′-dimethylaminoethanol;  steel  reinforcement Résumé : The aim of this study is to examine the influence of N,N′-dimethylaminoethanol (DMEA) as an inhibitor on the chloride threshold level for corrosion of steel in a concrete contaminated by chlorides. The experiment has been carried out in a saturated Ca(OH)2 solution and chloride contaminated concrete containing different chloride and DMEA level. The critical point of corrosion onset is concluded by combining the open-circuit potential (Ecorr) with corrosion current (Icorr), which is decided by electrochemical impedance spectra (EIS) in the solution. Besides, the EIS has also been applied to determinate the chloride threshold level in the chloride contaminated concrete. It has been found that the presence of DMEA represented as an amino-alcohol inhibitor, exerts little influence on the chloride threshold level for corrosion of steel in the solution. Similarly, the effect of the DMEA on the chloride threshold level in the chloride contaminated concrete, is also negligible. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905393/abstract

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