Dépouillements

Corrosion and corrosion protection of support structures for offshore wind energy devices (OWEA) / A. Momber in Materials and corrosion, Vol. 62 N° 5 (Mai 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 5 (Mai 2011) . - pp. 391–404 Titre : Corrosion and corrosion protection of support structures for offshore wind energy devices (OWEA) Type de document : texte imprimé Auteurs : A. Momber, Auteur Année de publication : 2011 Article en page(s) : pp. 391–404 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Cathodic  protection  Coatings  Corrosivity  Wind  energy Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The paper provides a review about the corrosion and corrosion protection of offshore wind energy devices (OWEA). Firstly, special features resulting from location and operation of OWEA are being discussed. Secondly, types of corrosion and corrosion phenomena are summarized in a systematic way. Finally, practical solutions to the corrosion protection of OWEA, including steel allowances, cathodic protection and coatings and linings, are discussed. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005691/abstract [article] Corrosion and corrosion protection of support structures for offshore wind energy devices (OWEA) [texte imprimé] / A. Momber, Auteur . - 2011 . - pp. 391–404. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 5 (Mai 2011) . - pp. 391–404 Mots-clés : Cathodic  protection  Coatings  Corrosivity  Wind  energy Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The paper provides a review about the corrosion and corrosion protection of offshore wind energy devices (OWEA). Firstly, special features resulting from location and operation of OWEA are being discussed. Secondly, types of corrosion and corrosion phenomena are summarized in a systematic way. Finally, practical solutions to the corrosion protection of OWEA, including steel allowances, cathodic protection and coatings and linings, are discussed. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005691/abstract

Effect of preparation method on the anti-corrosive properties of nanocrystalline Zn–CoO ceramic pigments / S. Rasouli in Materials and corrosion, Vol. 62 N° 5 (Mai 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 5 (Mai 2011) . - pp. 405–410 Titre : Effect of preparation method on the anti-corrosive properties of nanocrystalline Zn–CoO ceramic pigments Type de document : texte imprimé Auteurs : S. Rasouli, Auteur ; I. Danaee, Auteur Année de publication : 2011 Article en page(s) : pp. 405–410 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Anti-corrosive  High  energy  milling  Mild  steel  electrode  Pigment  Solution  combustion Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Zn–CoO green ceramic pigments were synthesized by two different methods; high energy ball milling and solution combustion, with two different fuels; citric acid and glycine. Products were characterized by X-ray diffraction and scanning–transmission electron microscopy (TEM). The anti-corrosive properties of the obtained pigments were investigated by electrochemical impedance spectroscopy (EIS) techniques. Results have shown that either by solid state reaction or combustion by citric acid, a calcination step was needed to obtain the desired phase whereas by glycine fuel, pure ZnO phase was obtained directly. TEM showed particles with mean particle size of about 70, 150, and 180 nm for glycine, citric acid, and solid state reaction samples, respectively. The corrosion performance of the coating in 3% w/v NaCl solution was evaluated by EIS and polarization measurements. According to the measurements of EIS and electrochemical polarization, the coatings with glycine-based pigment showed the highest corrosion resistance among the prepared coatings. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005758/abstract [article] Effect of preparation method on the anti-corrosive properties of nanocrystalline Zn–CoO ceramic pigments [texte imprimé] / S. Rasouli, Auteur ; I. Danaee, Auteur . - 2011 . - pp. 405–410. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 5 (Mai 2011) . - pp. 405–410 Mots-clés : Anti-corrosive  High  energy  milling  Mild  steel  electrode  Pigment  Solution  combustion Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Zn–CoO green ceramic pigments were synthesized by two different methods; high energy ball milling and solution combustion, with two different fuels; citric acid and glycine. Products were characterized by X-ray diffraction and scanning–transmission electron microscopy (TEM). The anti-corrosive properties of the obtained pigments were investigated by electrochemical impedance spectroscopy (EIS) techniques. Results have shown that either by solid state reaction or combustion by citric acid, a calcination step was needed to obtain the desired phase whereas by glycine fuel, pure ZnO phase was obtained directly. TEM showed particles with mean particle size of about 70, 150, and 180 nm for glycine, citric acid, and solid state reaction samples, respectively. The corrosion performance of the coating in 3% w/v NaCl solution was evaluated by EIS and polarization measurements. According to the measurements of EIS and electrochemical polarization, the coatings with glycine-based pigment showed the highest corrosion resistance among the prepared coatings. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005758/abstract

Evolution of corrosion protection performance of hybrid silica based sol–gel nanocoatings by doping inorganic inhibitor / N. Pirhady Tavandashti in Materials and corrosion, Vol. 62 N° 5 (Mai 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 5 (Mai 2011) . - pp. 411–415 Titre : Evolution of corrosion protection performance of hybrid silica based sol–gel nanocoatings by doping inorganic inhibitor Type de document : texte imprimé Auteurs : N. Pirhady Tavandashti, Auteur ; S. Sanjabi, Auteur ; T. Shahrabi, Auteur Année de publication : 2011 Article en page(s) : pp. 411–415 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Aluminium  alloy  Cerium  nitrate  Hybrid  coating  Impedance  spectroscopy  Sol–gel Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Silica based hybrid sol–gel coatings were developed to protect AA2024 alloy from corrosion. In order to have an active protection, cerium nitrate corrosion inhibitor was introduced into the coating system. The anti-corrosion properties of the coatings were evaluated by electrochemical impedance spectroscopy (EIS) and potentiodynamic scanning (PDS) methods. The structure of the films was studied by scanning electron microscopy (SEM) after corrosion. The results indicate that the improvement of the protection properties of the films occurred with immersion time. This would imply that cerium ions could reach the defects, hindering the corrosion reactions and thus reduces the corrosion rate. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905529/abstract [article] Evolution of corrosion protection performance of hybrid silica based sol–gel nanocoatings by doping inorganic inhibitor [texte imprimé] / N. Pirhady Tavandashti, Auteur ; S. Sanjabi, Auteur ; T. Shahrabi, Auteur . - 2011 . - pp. 411–415. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 5 (Mai 2011) . - pp. 411–415 Mots-clés : Aluminium  alloy  Cerium  nitrate  Hybrid  coating  Impedance  spectroscopy  Sol–gel Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Silica based hybrid sol–gel coatings were developed to protect AA2024 alloy from corrosion. In order to have an active protection, cerium nitrate corrosion inhibitor was introduced into the coating system. The anti-corrosion properties of the coatings were evaluated by electrochemical impedance spectroscopy (EIS) and potentiodynamic scanning (PDS) methods. The structure of the films was studied by scanning electron microscopy (SEM) after corrosion. The results indicate that the improvement of the protection properties of the films occurred with immersion time. This would imply that cerium ions could reach the defects, hindering the corrosion reactions and thus reduces the corrosion rate. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905529/abstract

Oxidation mechanism of the Inconel 601 alloy at high temperatures / H. Buscail in Materials and corrosion, Vol. 62 N° 5 (Mai 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 5 (Mai 2011) . - pp. 416–422 Titre : Oxidation mechanism of the Inconel 601 alloy at high temperatures Type de document : texte imprimé Auteurs : H. Buscail, Auteur ; S. Perrier, Auteur ; C. Josse, Auteur Année de publication : 2011 Article en page(s) : pp. 416–422 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Aluminum  Cr2O3  Inconel  601  Nickel-base  superalloy  OxidationTitanium  X-ray  diffraction  (XRD) Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The Inconel 601 alloy oxidation was performed in air, in the temperature range 1000–1150 °C, during 90 h. Kinetic results show that the parabolic behavior is always followed in this temperature range. The Arrhenius plot of the kp values shows two different activation energies. Between 1000 and 1050 °C the activation energy is Ea1 = 160 ± 10 kJ/mol. In the 1050–1150 °C temperature range a higher value is calculated Ea2 = 252 ± 20 kJ/mol. The Ea2 value and the X-ray diffraction (XRD) results and scanning electron microscope (SEM) energy dispersive X-ray spectroscopy (EDS) examinations are in accordance with a scale growth mechanism limited by a growing Cr2O3 scale acting as a diffusion barrier. In the 1000–1050 °C temperature range the activation energy is lower and the structural analyses show that the oxide scale is not only composed of Cr2O3. Then, the oxide scale is composed of titanium oxides (TiO2 and Ti2Cr7O17) and chromia mixed together. A doping effect of the chromia scale by titanium can be envisaged. Our results also show the presence of some Mn1.5Cr1.5O4 at the external interface. This external subscale spalls off easily during cooling after the highest temperature oxidation tests. Nevertheless, XRD results and SEM–EDS observations show that the Cr2O3 scale remains very adherent on the substrate and can give a good oxidation protection. This good adherence can be related to the presence of a low amount of aluminum in the Inconel 601 alloy composition. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905519/abstract [article] Oxidation mechanism of the Inconel 601 alloy at high temperatures [texte imprimé] / H. Buscail, Auteur ; S. Perrier, Auteur ; C. Josse, Auteur . - 2011 . - pp. 416–422. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 5 (Mai 2011) . - pp. 416–422 Mots-clés : Aluminum  Cr2O3  Inconel  601  Nickel-base  superalloy  OxidationTitanium  X-ray  diffraction  (XRD) Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The Inconel 601 alloy oxidation was performed in air, in the temperature range 1000–1150 °C, during 90 h. Kinetic results show that the parabolic behavior is always followed in this temperature range. The Arrhenius plot of the kp values shows two different activation energies. Between 1000 and 1050 °C the activation energy is Ea1 = 160 ± 10 kJ/mol. In the 1050–1150 °C temperature range a higher value is calculated Ea2 = 252 ± 20 kJ/mol. The Ea2 value and the X-ray diffraction (XRD) results and scanning electron microscope (SEM) energy dispersive X-ray spectroscopy (EDS) examinations are in accordance with a scale growth mechanism limited by a growing Cr2O3 scale acting as a diffusion barrier. In the 1000–1050 °C temperature range the activation energy is lower and the structural analyses show that the oxide scale is not only composed of Cr2O3. Then, the oxide scale is composed of titanium oxides (TiO2 and Ti2Cr7O17) and chromia mixed together. A doping effect of the chromia scale by titanium can be envisaged. Our results also show the presence of some Mn1.5Cr1.5O4 at the external interface. This external subscale spalls off easily during cooling after the highest temperature oxidation tests. Nevertheless, XRD results and SEM–EDS observations show that the Cr2O3 scale remains very adherent on the substrate and can give a good oxidation protection. This good adherence can be related to the presence of a low amount of aluminum in the Inconel 601 alloy composition. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905519/abstract

Correction of chloride threshold concentration and time-to-corrosion due to reinforcement presence / H. Yu in Materials and corrosion, Vol. 62 N° 5 (Mai 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 5 (Mai 2011) . - pp. 423–430 Titre : Correction of chloride threshold concentration and time-to-corrosion due to reinforcement presence Type de document : texte imprimé Auteurs : H. Yu, Auteur ; W. Hartt, Auteur Année de publication : 2011 Article en page(s) : pp. 423–430 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Chloride  threshold  concentration  Diffusion  coefficient  Reinforcement  Time-to-corrosion Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Reinforcement presence affecting corrosion threshold concentration, Ct, determination and time-to-corrosion, Ti, has been investigated. Elevated Ct and decreased Ti due to reinforcement physical obstruction on the path of chloride ingression into concrete has been examined with finite element modeling. Results indicated that reinforcement with larger size, better corrosion resistance, less cover thickness, or a more flat leading edge causes more pronounced Ti reduction. Experimental results exposed aggregate content discrepancy within reinforced bar vicinity zone. According to this finding, a multi-shell chloride diffusion model, in which specific chloride ion diffusivity in each shell surrounding bar presents, is proposed. The Ct results of proposed model are discussed along with those acquired from traditional one-dimensional model, in which chloride diffusion follows Fick's second law without considering reinforcement presence, and two-dimensional model with the effect of reinforcement physical obstruction regarded. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905516/abstract [article] Correction of chloride threshold concentration and time-to-corrosion due to reinforcement presence [texte imprimé] / H. Yu, Auteur ; W. Hartt, Auteur . - 2011 . - pp. 423–430. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 5 (Mai 2011) . - pp. 423–430 Mots-clés : Chloride  threshold  concentration  Diffusion  coefficient  Reinforcement  Time-to-corrosion Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Reinforcement presence affecting corrosion threshold concentration, Ct, determination and time-to-corrosion, Ti, has been investigated. Elevated Ct and decreased Ti due to reinforcement physical obstruction on the path of chloride ingression into concrete has been examined with finite element modeling. Results indicated that reinforcement with larger size, better corrosion resistance, less cover thickness, or a more flat leading edge causes more pronounced Ti reduction. Experimental results exposed aggregate content discrepancy within reinforced bar vicinity zone. According to this finding, a multi-shell chloride diffusion model, in which specific chloride ion diffusivity in each shell surrounding bar presents, is proposed. The Ct results of proposed model are discussed along with those acquired from traditional one-dimensional model, in which chloride diffusion follows Fick's second law without considering reinforcement presence, and two-dimensional model with the effect of reinforcement physical obstruction regarded. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905516/abstract

Research on coating deterioration process under fully immersing condition by using multi-parameters / X. Zhao in Materials and corrosion, Vol. 62 N° 5 (Mai 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 5 (Mai 2011) . - pp. 431–435 Titre : Research on coating deterioration process under fully immersing condition by using multi-parameters Type de document : texte imprimé Auteurs : X. Zhao, Auteur ; J. Wang, Auteur ; W. Li, Auteur Année de publication : 2011 Article en page(s) : pp. 431–435 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Changing  rate  of  impedance  Deterioration  process  EIS Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : In this paper, a parameter, named as the changing rate of impedance (CRI) derived from electrochemical impedance spectroscopy (EIS) data was selected. The deterioration process of organic coating was investigated by analyzing this parameter using neural network toolbox. In addition, four parameters characterizing the coating state were fitted by appropriate equivalent circuits (ECs). Integrating all the results of CRI and the evaluation of fitted parameters, it can be deduced that three stages were presented in the entire coating deterioration process, which separately represented the process of water penetration, corrosion acceleration, and coating deterioration. Furthermore, CRI was proved to be a credible parameter to depict coating state in its entire deterioration process. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905496/abstract [article] Research on coating deterioration process under fully immersing condition by using multi-parameters [texte imprimé] / X. Zhao, Auteur ; J. Wang, Auteur ; W. Li, Auteur . - 2011 . - pp. 431–435. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 5 (Mai 2011) . - pp. 431–435 Mots-clés : Changing  rate  of  impedance  Deterioration  process  EIS Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : In this paper, a parameter, named as the changing rate of impedance (CRI) derived from electrochemical impedance spectroscopy (EIS) data was selected. The deterioration process of organic coating was investigated by analyzing this parameter using neural network toolbox. In addition, four parameters characterizing the coating state were fitted by appropriate equivalent circuits (ECs). Integrating all the results of CRI and the evaluation of fitted parameters, it can be deduced that three stages were presented in the entire coating deterioration process, which separately represented the process of water penetration, corrosion acceleration, and coating deterioration. Furthermore, CRI was proved to be a credible parameter to depict coating state in its entire deterioration process. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905496/abstract

Corrosion properties of a plastic mould steel with special focus on the processing route / H. Hill in Materials and corrosion, Vol. 62 N° 5 (Mai 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 5 (Mai 2011) . - pp. 436–443 Titre : Corrosion properties of a plastic mould steel with special focus on the processing route Type de document : texte imprimé Auteurs : H. Hill, Auteur ; S. Huth, Auteur ; S. Weber, Auteur Année de publication : 2011 Article en page(s) : pp. 436–443 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Plastic  mould  steels  Computational  thermodynamics  Hot  isostatic  pressing  (HIP)  Super  solidus  liquid  phase  sintering  (SLPS)  Corrosion  resistance  Wear  resistance Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Applications in plastics processing bear increased requirements for the used materials, especially with respect to their corrosion and wear resistance. For this reason, special powder metallurgical tools steels were developed that fulfil these demands. The common processing route for their production is hot isostatic pressing (HIP) of pre-alloyed powders which is followed by hot working if semi-finished parts are to be produced. As an alternative to HIP, super solidus liquid phase sintering (SLPS) permits the consolidation of pre-alloyed tool steel powders to near net-shape parts. It can be performed in different sintering atmospheres. In this work, the plastic mould steel X190CrVMo20-4 was processed by SLPS in vacuum as well as under nitrogen atmosphere. The resulting materials were analysed with respect to their microstructure, tempering behaviour and corrosion resistance in 0.5 molar sulphuric acid in dependence of the heat treatment. As a reference, the HIPed and the HIPed and worked state were also investigated. The results show that different heat treatments alter the ranking of the sintered and the HIPed state with respect to corrosion resistance. As expected, a high tempering for maximum secondary hardness causes a significant loss of corrosion resistance. The experimental findings were supported by thermodynamic calculations based on slight alterations in chemical composition that result from the different manufacturing processes. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905570/abstract [article] Corrosion properties of a plastic mould steel with special focus on the processing route [texte imprimé] / H. Hill, Auteur ; S. Huth, Auteur ; S. Weber, Auteur . - 2011 . - pp. 436–443. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 5 (Mai 2011) . - pp. 436–443 Mots-clés : Plastic  mould  steels  Computational  thermodynamics  Hot  isostatic  pressing  (HIP)  Super  solidus  liquid  phase  sintering  (SLPS)  Corrosion  resistance  Wear  resistance Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Applications in plastics processing bear increased requirements for the used materials, especially with respect to their corrosion and wear resistance. For this reason, special powder metallurgical tools steels were developed that fulfil these demands. The common processing route for their production is hot isostatic pressing (HIP) of pre-alloyed powders which is followed by hot working if semi-finished parts are to be produced. As an alternative to HIP, super solidus liquid phase sintering (SLPS) permits the consolidation of pre-alloyed tool steel powders to near net-shape parts. It can be performed in different sintering atmospheres. In this work, the plastic mould steel X190CrVMo20-4 was processed by SLPS in vacuum as well as under nitrogen atmosphere. The resulting materials were analysed with respect to their microstructure, tempering behaviour and corrosion resistance in 0.5 molar sulphuric acid in dependence of the heat treatment. As a reference, the HIPed and the HIPed and worked state were also investigated. The results show that different heat treatments alter the ranking of the sintered and the HIPed state with respect to corrosion resistance. As expected, a high tempering for maximum secondary hardness causes a significant loss of corrosion resistance. The experimental findings were supported by thermodynamic calculations based on slight alterations in chemical composition that result from the different manufacturing processes. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905570/abstract

Corrosion behaviors of carbon steel in 55% LiBr solution containing PWVA inhibitor / X. Q. Hu in Materials and corrosion, Vol. 62 N° 5 (Mai 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 5 (Mai 2011) . - pp. 444–448 Titre : Corrosion behaviors of carbon steel in 55% LiBr solution containing PWVA inhibitor Type de document : texte imprimé Auteurs : X. Q. Hu, Auteur ; C. H. Liang, Auteur ; X. N. Wu, Auteur Année de publication : 2011 Article en page(s) : pp. 444–448 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Corrosion  Corrosion  test  Inhibition  Inhibitor Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The inhibition performance of PWVA inhibitor on carbon steel was studied in 55% LiBr + 0.07 mol/L LiOH solution. Results indicated that PWVA inhibitor decreased both anodic and cathodic polarization current density and widened the passive potential region of carbon steel in the test solution. It could be classified as mixed inhibitor. PWVA has a strong oxidizability. It could form an intact and compact film which consisted of Fe2O3 on carbon steel surface in the test solution. The passive film retarded Br− which corroded the metal matrix in the test solution. When the concentration of PWVA was 300 mg/L, it showed an excellent inhibition effect. However, when the temperature was higher than 173 °C, the corrosion rate of carbon steel in 55% LiBr + 0.07 mol/L LiOH solution increased rapidly. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905528/abstract [article] Corrosion behaviors of carbon steel in 55% LiBr solution containing PWVA inhibitor [texte imprimé] / X. Q. Hu, Auteur ; C. H. Liang, Auteur ; X. N. Wu, Auteur . - 2011 . - pp. 444–448. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 5 (Mai 2011) . - pp. 444–448 Mots-clés : Corrosion  Corrosion  test  Inhibition  Inhibitor Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The inhibition performance of PWVA inhibitor on carbon steel was studied in 55% LiBr + 0.07 mol/L LiOH solution. Results indicated that PWVA inhibitor decreased both anodic and cathodic polarization current density and widened the passive potential region of carbon steel in the test solution. It could be classified as mixed inhibitor. PWVA has a strong oxidizability. It could form an intact and compact film which consisted of Fe2O3 on carbon steel surface in the test solution. The passive film retarded Br− which corroded the metal matrix in the test solution. When the concentration of PWVA was 300 mg/L, it showed an excellent inhibition effect. However, when the temperature was higher than 173 °C, the corrosion rate of carbon steel in 55% LiBr + 0.07 mol/L LiOH solution increased rapidly. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905528/abstract

The possibility for formation of macro-cell corrosion in a liquid with low electrical conductivity / M. Matsumura in Materials and corrosion, Vol. 62 N° 5 (Mai 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 5 (Mai 2011) . - pp. 449–453 Titre : The possibility for formation of macro-cell corrosion in a liquid with low electrical conductivity Type de document : texte imprimé Auteurs : M. Matsumura, Auteur Année de publication : 2011 Article en page(s) : pp. 449–453 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Carbon  steel  pipe  Flow  accelerated  corrosion  Macro-cell  corrosion  Micro-cell  corrosion  Mihama  nuclear  power  plant  Pure  water Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The possibility of electrochemical corrosion of carbon steel at the rate of 3.25 × 10−5 A/cm2 in water was examined under the conditions present during an accidental pipe rupture at the Mihama nuclear power plant: liquid conductivity, 7.5 µS/cm; dissolved oxygen concentration, 5 ppb or less; pH 8.6∼9.3; ferrous ion concentration, 20 ppb or less; temperature, 142 °C. The corrosion rate of iron in a micro-cell with a dissolved oxygen reduction cathode was estimated to be only 1/400 of the preceding rate. On the other hand, that in a micro-cell with a hydrogen ion reduction cathode was estimated to be as high as 1/10 of the preceding rate, that is, 3.25 × 10−6 A/cm2. Two important factors may have influenced the corrosion rate: the remarkable wall thinning, which must have been the direct cause of the rupture of the pipe, was located close to, and downstream from, an orifice; and, the water temperature was in the range at which carbon steel makes a transition from the active to the passive state. Taking these facts into consideration, it appears possible that micro-cells with different corrosion rates might be generated and integrated into a macro-cell, where the iron dissolution rate might be accelerated to as much as 10 times that of the micro-cell. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905573/abstract [article] The possibility for formation of macro-cell corrosion in a liquid with low electrical conductivity [texte imprimé] / M. Matsumura, Auteur . - 2011 . - pp. 449–453. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 5 (Mai 2011) . - pp. 449–453 Mots-clés : Carbon  steel  pipe  Flow  accelerated  corrosion  Macro-cell  corrosion  Micro-cell  corrosion  Mihama  nuclear  power  plant  Pure  water Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The possibility of electrochemical corrosion of carbon steel at the rate of 3.25 × 10−5 A/cm2 in water was examined under the conditions present during an accidental pipe rupture at the Mihama nuclear power plant: liquid conductivity, 7.5 µS/cm; dissolved oxygen concentration, 5 ppb or less; pH 8.6∼9.3; ferrous ion concentration, 20 ppb or less; temperature, 142 °C. The corrosion rate of iron in a micro-cell with a dissolved oxygen reduction cathode was estimated to be only 1/400 of the preceding rate. On the other hand, that in a micro-cell with a hydrogen ion reduction cathode was estimated to be as high as 1/10 of the preceding rate, that is, 3.25 × 10−6 A/cm2. Two important factors may have influenced the corrosion rate: the remarkable wall thinning, which must have been the direct cause of the rupture of the pipe, was located close to, and downstream from, an orifice; and, the water temperature was in the range at which carbon steel makes a transition from the active to the passive state. Taking these facts into consideration, it appears possible that micro-cells with different corrosion rates might be generated and integrated into a macro-cell, where the iron dissolution rate might be accelerated to as much as 10 times that of the micro-cell. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905573/abstract

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