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The effect of tannins and pH on the corrosion of steel in wood extracts / S. L. Zelinka in Materials and corrosion, Vol. 62 N° 8 (Août 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 8 (Août 2011) . - pp. 739-744 Titre : The effect of tannins and pH on the corrosion of steel in wood extracts Type de document : texte imprimé Auteurs : S. L. Zelinka, Auteur ; D. S. Stone, Auteur Année de publication : 2011 Article en page(s) : pp. 739-744 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Corrosion  Isocorrosion  diagram  PH  Tannins  Wood  Wood  extractive Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Tannins and pH are often cited as factors that affect the corrosiveness of wood yet there are few data to confirm these statements. The purpose of this paper is to systematically investigate the effect of tannins and pH on corrosion of metals in wood. Four wood species known to vary in both their pH and extractives were chosen and extracted with water. The pH, tannin content, and corrosion rate of carbon steel were determined for each extract. To test if pH and tannin were the only factors influencing corrosion, “synthetic” extracts were made by adding tannins to distilled water and adjusting the pH. At a given pH, increasing the tannin content inhibited corrosion and at a given level of tannin content, lowering the pH increased corrosion. An isocorrosion map as a function of pH and tannins was developed by using simple kinetic models to extrapolate the data. The data may be useful in estimating the relative corrosiveness of new, nonmetallic wood preservatives based upon the chemistry of naturally durable wood species. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005845/abstract [article] The effect of tannins and pH on the corrosion of steel in wood extracts [texte imprimé] / S. L. Zelinka, Auteur ; D. S. Stone, Auteur . - 2011 . - pp. 739-744. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 8 (Août 2011) . - pp. 739-744 Mots-clés : Corrosion  Isocorrosion  diagram  PH  Tannins  Wood  Wood  extractive Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Tannins and pH are often cited as factors that affect the corrosiveness of wood yet there are few data to confirm these statements. The purpose of this paper is to systematically investigate the effect of tannins and pH on corrosion of metals in wood. Four wood species known to vary in both their pH and extractives were chosen and extracted with water. The pH, tannin content, and corrosion rate of carbon steel were determined for each extract. To test if pH and tannin were the only factors influencing corrosion, “synthetic” extracts were made by adding tannins to distilled water and adjusting the pH. At a given pH, increasing the tannin content inhibited corrosion and at a given level of tannin content, lowering the pH increased corrosion. An isocorrosion map as a function of pH and tannins was developed by using simple kinetic models to extrapolate the data. The data may be useful in estimating the relative corrosiveness of new, nonmetallic wood preservatives based upon the chemistry of naturally durable wood species. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005845/abstract

Correlation of content and corrosion protection of volatile corrosion inhibitors in packaging material – regaining trust in VCI / S. Eibl in Materials and corrosion, Vol. 62 N° 8 (Août 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 8 (Août 2011) . - pp. 745-752 Titre : Correlation of content and corrosion protection of volatile corrosion inhibitors in packaging material – regaining trust in VCI Type de document : texte imprimé Auteurs : S. Eibl, Auteur ; D. Reiner, Auteur Année de publication : 2011 Article en page(s) : pp. 745-752 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Amine  Corrosion  prevention  Nitrite  VCI  Volatile  corrosion  inhibitor Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Two representative types of commercial volatile corrosion inhibitor (VCI) packaging materials without a potential for health hazards according to TRGS 615 were investigated: a paper containing ethanol amine and a polyethylene foil containing sodium nitrite as main VCI ingredients. For a variation of VCI concentration the packaging material was thermally treated at 60–100 °C and the amount of VCI remaining was determined after this accelerated desorption. Additionally a nitrite-free polyethylene foil was impregnated with various amounts of sodium nitrite. Correlations of VCI content – of both the amine and nitrite – with corrosion protection of mild steel were observed. For ethanol amine a color change reaction is proposed to indicate the remaining potential of corrosion protection. This work is aimed at regaining trust in VCI technology. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905546/abstract [article] Correlation of content and corrosion protection of volatile corrosion inhibitors in packaging material – regaining trust in VCI [texte imprimé] / S. Eibl, Auteur ; D. Reiner, Auteur . - 2011 . - pp. 745-752. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 8 (Août 2011) . - pp. 745-752 Mots-clés : Amine  Corrosion  prevention  Nitrite  VCI  Volatile  corrosion  inhibitor Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Two representative types of commercial volatile corrosion inhibitor (VCI) packaging materials without a potential for health hazards according to TRGS 615 were investigated: a paper containing ethanol amine and a polyethylene foil containing sodium nitrite as main VCI ingredients. For a variation of VCI concentration the packaging material was thermally treated at 60–100 °C and the amount of VCI remaining was determined after this accelerated desorption. Additionally a nitrite-free polyethylene foil was impregnated with various amounts of sodium nitrite. Correlations of VCI content – of both the amine and nitrite – with corrosion protection of mild steel were observed. For ethanol amine a color change reaction is proposed to indicate the remaining potential of corrosion protection. This work is aimed at regaining trust in VCI technology. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905546/abstract

Susceptibility of 316L stainless steel to crevice corrosion in submersible solenoid valve / B. P. Cai in Materials and corrosion, Vol. 62 N° 8 (Août 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 8 (Août 2011) . - pp. 753-759 Titre : Susceptibility of 316L stainless steel to crevice corrosion in submersible solenoid valve Type de document : texte imprimé Auteurs : B. P. Cai, Auteur ; Y. H. Liu, Auteur ; X. J. Tian, Auteur Année de publication : 2011 Article en page(s) : pp. 753-759 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : AFM  Crevice  corrosion  SEM  Stainless  steel Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The susceptibility of 316L stainless steel to crevice corrosion was investigated by using immersion test and electrochemical test. Three kinds of crevices including 316L-to-polytetrafluoroethylene (PTFE) crevice, 316L-to-fluoroelastomeric (FKM) crevice and 316L-to-316L crevice were tested in artificial seawater at 50°C. The results indicate that 316L stainless steel specimen is the most susceptible to crevice corrosion when it is coupled to 316L stainless steel crevice former, while it is the least susceptible when it is coupled to FKM crevice former. It suggests that during submersible solenoid valve design, the crevice of metal-to-metal should be moderately large so that crevice corrosion can not initiate and propagate, and FKM O-ring rather than PTFE O-ring should be selected as obturating ring. The corroded surface morphology was investigated using scanning electron microscopy (SEM) and atomic force microscopy (AFM). Three regions including passive region, active region and variable region can be observed on crevice corrosion sites. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005917/abstract [article] Susceptibility of 316L stainless steel to crevice corrosion in submersible solenoid valve [texte imprimé] / B. P. Cai, Auteur ; Y. H. Liu, Auteur ; X. J. Tian, Auteur . - 2011 . - pp. 753-759. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 8 (Août 2011) . - pp. 753-759 Mots-clés : AFM  Crevice  corrosion  SEM  Stainless  steel Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The susceptibility of 316L stainless steel to crevice corrosion was investigated by using immersion test and electrochemical test. Three kinds of crevices including 316L-to-polytetrafluoroethylene (PTFE) crevice, 316L-to-fluoroelastomeric (FKM) crevice and 316L-to-316L crevice were tested in artificial seawater at 50°C. The results indicate that 316L stainless steel specimen is the most susceptible to crevice corrosion when it is coupled to 316L stainless steel crevice former, while it is the least susceptible when it is coupled to FKM crevice former. It suggests that during submersible solenoid valve design, the crevice of metal-to-metal should be moderately large so that crevice corrosion can not initiate and propagate, and FKM O-ring rather than PTFE O-ring should be selected as obturating ring. The corroded surface morphology was investigated using scanning electron microscopy (SEM) and atomic force microscopy (AFM). Three regions including passive region, active region and variable region can be observed on crevice corrosion sites. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005917/abstract

Influence of heat flux on localised corrosion of stainless steel under boiling conditions / J. Stoulil in Materials and corrosion, Vol. 62 N° 8 (Août 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 8 (Août 2011) . - pp. 760-765 Titre : Influence of heat flux on localised corrosion of stainless steel under boiling conditions Type de document : texte imprimé Auteurs : J. Stoulil, Auteur ; J. Bystriansky, Auteur Année de publication : 2011 Article en page(s) : pp. 760-765 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Heat  transfer  Pitting  Stress  corrosion  cracking Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The article deals with the influence of heat flux on localised forms of corrosion of stainless steels under the conditions of phase transition on a metal surface. The observations focused on the influence of the initiation and propagation of pitting corrosion and stress corrosion cracking. Pitting corrosion was tested in the environment of 0.6% FeCl3 + 0.3% EDTA + 0.1% HCl, the susceptibility to stress corrosion cracking was verified in 35% MgCl2. The tests proved a negative influence of heat flux on the initiation and propagation of non-uniform corrosion. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905557/abstract [article] Influence of heat flux on localised corrosion of stainless steel under boiling conditions [texte imprimé] / J. Stoulil, Auteur ; J. Bystriansky, Auteur . - 2011 . - pp. 760-765. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 8 (Août 2011) . - pp. 760-765 Mots-clés : Heat  transfer  Pitting  Stress  corrosion  cracking Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The article deals with the influence of heat flux on localised forms of corrosion of stainless steels under the conditions of phase transition on a metal surface. The observations focused on the influence of the initiation and propagation of pitting corrosion and stress corrosion cracking. Pitting corrosion was tested in the environment of 0.6% FeCl3 + 0.3% EDTA + 0.1% HCl, the susceptibility to stress corrosion cracking was verified in 35% MgCl2. The tests proved a negative influence of heat flux on the initiation and propagation of non-uniform corrosion. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905557/abstract

Corrosion behavior of newly developed Ti–Ag–Fe dental alloys in neutral saline solution / B. B. Zhang in Materials and corrosion, Vol. 62 N° 8 (Août 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 8 (Août 2011) . - pp. 766-770 Titre : Corrosion behavior of newly developed Ti–Ag–Fe dental alloys in neutral saline solution Type de document : texte imprimé Auteurs : B. B. Zhang, Auteur ; B. L. Wang, Auteur ; Li, L., Auteur Année de publication : 2011 Article en page(s) : pp. 766-770 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Corrosion  Electrochemical  impedance  Microstructure  Ti–Ag–Fe  alloy Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The corrosion behavior of Ti–5Ag–xFe alloys (x = 1, 2.5, 5 wt%) in neutral saline solution was investigated by the open-circuit potential (OCP), potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and potentiostatic tests. The microstructural observation indicated that β-Ti phase was retained by the addition of Fe into Ti–Ag alloys. Compared with commercially pure (CP) Ti, Ti–5Ag–xFe alloys exhibited higher corrosion potentials, lower current densities, and larger impedance, these suggested that Ti–5Ag–xFe alloys have nobler electrochemical corrosion behavior when compared with CP Ti in neutral saline solution. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905561/abstract [article] Corrosion behavior of newly developed Ti–Ag–Fe dental alloys in neutral saline solution [texte imprimé] / B. B. Zhang, Auteur ; B. L. Wang, Auteur ; Li, L., Auteur . - 2011 . - pp. 766-770. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 8 (Août 2011) . - pp. 766-770 Mots-clés : Corrosion  Electrochemical  impedance  Microstructure  Ti–Ag–Fe  alloy Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The corrosion behavior of Ti–5Ag–xFe alloys (x = 1, 2.5, 5 wt%) in neutral saline solution was investigated by the open-circuit potential (OCP), potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and potentiostatic tests. The microstructural observation indicated that β-Ti phase was retained by the addition of Fe into Ti–Ag alloys. Compared with commercially pure (CP) Ti, Ti–5Ag–xFe alloys exhibited higher corrosion potentials, lower current densities, and larger impedance, these suggested that Ti–5Ag–xFe alloys have nobler electrochemical corrosion behavior when compared with CP Ti in neutral saline solution. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905561/abstract

Effect of porosity of phosphate coating on corrosion resistance of galvanized and phosphated steels. Part I, Measurement of porosity of phosphate / C. H. S. B. Teixeira in Materials and corrosion, Vol. 62 N° 8 (Août 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 8 (Août 2011) . - pp. 771-777 Titre : Effect of porosity of phosphate coating on corrosion resistance of galvanized and phosphated steels. Part I, Measurement of porosity of phosphate Type de document : texte imprimé Auteurs : C. H. S. B. Teixeira, Auteur ; E. A. Alvarenga, Auteur ; W. L. Vasconcelos, Auteur Année de publication : 2011 Article en page(s) : pp. 771-777 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Cathodic  polarization  Immersion  Phosphate  coating  Porosity  Spraying Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The corrosion resistance of phosphated and painted steels is associated with the integrity of phosphate and paint layers. In this work, a methodology to measure the porosity of phosphated coatings based on cathodic polarization technique with an electrolyte of a sodium sulfate aqueous solution was developed. The morphology and mass of phosphate layers were determined. Phosphating was performed using the spraying and immersion techniques, varying the refiner content of bath in the immersion operation. The phosphate coatings obtained by immersion with a refiner showed the lowest values of porosities among the samples studied. The phosphate layers, obtained by spraying, immersion without a refiner, and immersion with a half content of refiner, showed the lowest porosity on electrogalvanized steel. The phosphate layer obtained by immersion with a refiner displayed the lowest porosity on the substrate of ungalvanized steel. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905503/abstract [article] Effect of porosity of phosphate coating on corrosion resistance of galvanized and phosphated steels. Part I, Measurement of porosity of phosphate [texte imprimé] / C. H. S. B. Teixeira, Auteur ; E. A. Alvarenga, Auteur ; W. L. Vasconcelos, Auteur . - 2011 . - pp. 771-777. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 8 (Août 2011) . - pp. 771-777 Mots-clés : Cathodic  polarization  Immersion  Phosphate  coating  Porosity  Spraying Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The corrosion resistance of phosphated and painted steels is associated with the integrity of phosphate and paint layers. In this work, a methodology to measure the porosity of phosphated coatings based on cathodic polarization technique with an electrolyte of a sodium sulfate aqueous solution was developed. The morphology and mass of phosphate layers were determined. Phosphating was performed using the spraying and immersion techniques, varying the refiner content of bath in the immersion operation. The phosphate coatings obtained by immersion with a refiner showed the lowest values of porosities among the samples studied. The phosphate layers, obtained by spraying, immersion without a refiner, and immersion with a half content of refiner, showed the lowest porosity on electrogalvanized steel. The phosphate layer obtained by immersion with a refiner displayed the lowest porosity on the substrate of ungalvanized steel. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905503/abstract

Co-effect of bis(cyclohexanone) oxalyldihydrazone and copper(II) ion on the corrosion of cold rolled steel in 0.5 M hydrochloric acid solution / Q. Qu in Materials and corrosion, Vol. 62 N° 8 (Août 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 8 (Août 2011) . - pp. 778-785 Titre : Co-effect of bis(cyclohexanone) oxalyldihydrazone and copper(II) ion on the corrosion of cold rolled steel in 0.5 M hydrochloric acid solution Type de document : texte imprimé Auteurs : Q. Qu, Auteur ; G. Gao, Auteur ; H. Guo, Auteur Année de publication : 2011 Article en page(s) : pp. 778-785 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Bis(cyclohexanone)  oxalyldihydrazone  Cold  rolled  steel  Copper(II)  ion  Corrosion  Hydrochloric  acid Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Effects of bis(cyclohexanone) oxalyldihydrazone (BCO) and copper(II) ion (Cu2+) on the corrosion of cold rolled steel (CRS) in 0.5 M hydrochloric acid (HCl) solution were investigated using Tafel polarization curve and electrochemical impedance spectroscopy (EIS) at 20 °C. Results elucidate that the inhibition efficiency increases with increase in BCO concentration, and the addition of 10−5 M Cu2+ significantly enhances the inhibition efficiency of BCO. Polarization curve results elucidate that the single BCO acts as a mixed-type inhibitor while the combination of Cu2+ and BCO acts as cathodic inhibitor. Ultraviolet and visible spectrophotometer (UV–Vis) results show that BCO molecules do not interact with Cu2+ and Fe2+ in 0.5 M HCl solution. Atomic force microscope (AFM) result indicates that a protective layer forms on CRS surface after immersion in 0.5 M HCl containing BCO in the absence and presence of Cu2+. The adsorption of BCO is found to follow the Langmuir adsorption isotherm in the presence and absence of Cu2+. The mechanism of typically chemical adsorption is proposed via the value of free energy of adsorption (ΔG) in the presence of BCO and Cu2+. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905522/abstract [article] Co-effect of bis(cyclohexanone) oxalyldihydrazone and copper(II) ion on the corrosion of cold rolled steel in 0.5 M hydrochloric acid solution [texte imprimé] / Q. Qu, Auteur ; G. Gao, Auteur ; H. Guo, Auteur . - 2011 . - pp. 778-785. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 8 (Août 2011) . - pp. 778-785 Mots-clés : Bis(cyclohexanone)  oxalyldihydrazone  Cold  rolled  steel  Copper(II)  ion  Corrosion  Hydrochloric  acid Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Effects of bis(cyclohexanone) oxalyldihydrazone (BCO) and copper(II) ion (Cu2+) on the corrosion of cold rolled steel (CRS) in 0.5 M hydrochloric acid (HCl) solution were investigated using Tafel polarization curve and electrochemical impedance spectroscopy (EIS) at 20 °C. Results elucidate that the inhibition efficiency increases with increase in BCO concentration, and the addition of 10−5 M Cu2+ significantly enhances the inhibition efficiency of BCO. Polarization curve results elucidate that the single BCO acts as a mixed-type inhibitor while the combination of Cu2+ and BCO acts as cathodic inhibitor. Ultraviolet and visible spectrophotometer (UV–Vis) results show that BCO molecules do not interact with Cu2+ and Fe2+ in 0.5 M HCl solution. Atomic force microscope (AFM) result indicates that a protective layer forms on CRS surface after immersion in 0.5 M HCl containing BCO in the absence and presence of Cu2+. The adsorption of BCO is found to follow the Langmuir adsorption isotherm in the presence and absence of Cu2+. The mechanism of typically chemical adsorption is proposed via the value of free energy of adsorption (ΔG) in the presence of BCO and Cu2+. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905522/abstract

Comparative analysis for the corrosion susceptibility of Cu, Al, Al–Cu and C-steel in soil solution / E. A. Noor in Materials and corrosion, Vol. 62 N° 8 (Août 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 8 (Août 2011) . - pp. 786-795 Titre : Comparative analysis for the corrosion susceptibility of Cu, Al, Al–Cu and C-steel in soil solution Type de document : texte imprimé Auteurs : E. A. Noor, Auteur Année de publication : 2011 Article en page(s) : pp. 786-795 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Biofilm  corrosion  Electrochemical  impedance  Polarization  Soil  solution  Sulphate  reducing  bacteria Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Corrosion of different materials (Cu, Al, Al–Cu and C-steel) in soil solution was evaluated at ambient temperature using various techniques. The weight loss of the studied materials varied exponentially with time. Kinetic data revealed that the corrosion of Cu and Al–Cu are diffusion controlled while Al and C-steel show gradual change from diffusion control to charge transfer control. Nonferrous materials have better durability factors than C-steel. Good consistency between the data obtained from EIS and PDP measurements was observed. SEM showed a biogenic corrosion layer with density that depends on the metal type. Correlation between corrosion rates and the estimated soil solution corrosivity was obtained. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905572/abstract [article] Comparative analysis for the corrosion susceptibility of Cu, Al, Al–Cu and C-steel in soil solution [texte imprimé] / E. A. Noor, Auteur . - 2011 . - pp. 786-795. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 8 (Août 2011) . - pp. 786-795 Mots-clés : Biofilm  corrosion  Electrochemical  impedance  Polarization  Soil  solution  Sulphate  reducing  bacteria Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Corrosion of different materials (Cu, Al, Al–Cu and C-steel) in soil solution was evaluated at ambient temperature using various techniques. The weight loss of the studied materials varied exponentially with time. Kinetic data revealed that the corrosion of Cu and Al–Cu are diffusion controlled while Al and C-steel show gradual change from diffusion control to charge transfer control. Nonferrous materials have better durability factors than C-steel. Good consistency between the data obtained from EIS and PDP measurements was observed. SEM showed a biogenic corrosion layer with density that depends on the metal type. Correlation between corrosion rates and the estimated soil solution corrosivity was obtained. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905572/abstract

Integral diagnostic in the failure causes of external corrosion of a natural gas transport pipeline / J. L. Mora-Mendoza in Materials and corrosion, Vol. 62 N° 8 (Août 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 8 (Août 2011) . - pp. 796-801 Titre : Integral diagnostic in the failure causes of external corrosion of a natural gas transport pipeline Type de document : texte imprimé Auteurs : J. L. Mora-Mendoza, Auteur ; L. C. Saucedo-Robles, Auteur ; H. Rodriguez-Clemente, Auteur Année de publication : 2011 Article en page(s) : pp. 796-801 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Cathodic  protection  (CP)CIS-DCVG  External  corrosion  In-line  inspection  (ILI)  Protective  coating Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The objective of this study consisted in investigating the possible causes which give rise to the presence of low wall pipe thicknesses on a 16″ natural gas transport pipeline, even though during the last 12-year period cathodic protection (CP) potentials were kept in the protection range at which external corrosion should not occur. Results from in-line inspection from a 16″ natural gas transport pipeline showed 46 indications with more than 80% wall thickness lost due to external corrosion in the second segment of the pipeline. Direct inspection at the indication locations, review of the CP system performance, pipeline maintenance programs and studies, allowed to make an integral diagnostic where it was found out that the main cause of external corrosion was an inappropriate coating application since the pipeline construction, this situation has originated the increase of CP shielding effects through time. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905581/abstract [article] Integral diagnostic in the failure causes of external corrosion of a natural gas transport pipeline [texte imprimé] / J. L. Mora-Mendoza, Auteur ; L. C. Saucedo-Robles, Auteur ; H. Rodriguez-Clemente, Auteur . - 2011 . - pp. 796-801. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 8 (Août 2011) . - pp. 796-801 Mots-clés : Cathodic  protection  (CP)CIS-DCVG  External  corrosion  In-line  inspection  (ILI)  Protective  coating Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The objective of this study consisted in investigating the possible causes which give rise to the presence of low wall pipe thicknesses on a 16″ natural gas transport pipeline, even though during the last 12-year period cathodic protection (CP) potentials were kept in the protection range at which external corrosion should not occur. Results from in-line inspection from a 16″ natural gas transport pipeline showed 46 indications with more than 80% wall thickness lost due to external corrosion in the second segment of the pipeline. Direct inspection at the indication locations, review of the CP system performance, pipeline maintenance programs and studies, allowed to make an integral diagnostic where it was found out that the main cause of external corrosion was an inappropriate coating application since the pipeline construction, this situation has originated the increase of CP shielding effects through time. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905581/abstract

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