Dépouillements

Corrosion of stainless steel grades in molten NaOH/KOH eutectic at 250 °C: AISI304 austenitic and 2205 duplex / B. Bozzini in Materials and corrosion, Vol. 63 N° 11 (Novembre 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 11 (Novembre 2012) . - pp. 967–978 Titre : Corrosion of stainless steel grades in molten NaOH/KOH eutectic at 250 °C: AISI304 austenitic and 2205 duplex Type de document : texte imprimé Auteurs : B. Bozzini, Auteur ; S. Barella, Auteur ; F. Bogani, Auteur Année de publication : 2014 Article en page(s) : pp. 967–978 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Austenitic  stainless  steel;  duplex  stainless  steel;  EIS;  KOH;  molten  alkali;  NaOH Résumé : The present paper focuses on the corrosion of an austenitic (AISI304) and a duplex (2205) stainless steel grade in molten KOH/NaOH 50 w/o eutectic at 250 °C. Experimental activities have been performed consisting in electrochemical measurements (linear sweep voltammetry and electrochemical impedance spectrometry) complemented by metallographic (in-plane and cross-sectional SEM micrography), structural (X-ray diffractometry) and compositional (EDX line-profiles) characterisation of the materials attacked under electrochemically controlled conditions. Electrochemical measurements have shown that AISI304 exhibits a passivating behaviour, characterised by two passivation peaks and a transpassive threshold, while duplex, does not yield a clear indication of passivation. AISI304 was found to fail by intergranular corrosion and to be covered in both passive and transpassive conditions, by an incoherent scale, containing electrolyte species. Duplex samples, instead tends to fail by homogeneous attack and exhibit a range of scale structures, depending on the applied potential. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106386/abstract [article] Corrosion of stainless steel grades in molten NaOH/KOH eutectic at 250 °C: AISI304 austenitic and 2205 duplex [texte imprimé] / B. Bozzini, Auteur ; S. Barella, Auteur ; F. Bogani, Auteur . - 2014 . - pp. 967–978. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 11 (Novembre 2012) . - pp. 967–978 Mots-clés : Austenitic  stainless  steel;  duplex  stainless  steel;  EIS;  KOH;  molten  alkali;  NaOH Résumé : The present paper focuses on the corrosion of an austenitic (AISI304) and a duplex (2205) stainless steel grade in molten KOH/NaOH 50 w/o eutectic at 250 °C. Experimental activities have been performed consisting in electrochemical measurements (linear sweep voltammetry and electrochemical impedance spectrometry) complemented by metallographic (in-plane and cross-sectional SEM micrography), structural (X-ray diffractometry) and compositional (EDX line-profiles) characterisation of the materials attacked under electrochemically controlled conditions. Electrochemical measurements have shown that AISI304 exhibits a passivating behaviour, characterised by two passivation peaks and a transpassive threshold, while duplex, does not yield a clear indication of passivation. AISI304 was found to fail by intergranular corrosion and to be covered in both passive and transpassive conditions, by an incoherent scale, containing electrolyte species. Duplex samples, instead tends to fail by homogeneous attack and exhibit a range of scale structures, depending on the applied potential. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106386/abstract

The influence of secondary phase carbide particles on the passivity behaviour of NiTi shape memory alloys / L. Neelakantan in Materials and corrosion, Vol. 63 N° 11 (Novembre 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 11 (Novembre 2012) . - pp. 979–984 Titre : The influence of secondary phase carbide particles on the passivity behaviour of NiTi shape memory alloys Type de document : texte imprimé Auteurs : L. Neelakantan, Auteur ; B. Monchev, Auteur ; M. Frotscher, Auteur Année de publication : 2014 Article en page(s) : pp. 979–984 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Inclusions;  interfaces;  nickel  titanium  shape  memory  alloys;  pitting;  polarisation Résumé : The current investigation aims at studying the passivity behaviour of NiTi shape memory alloys with different levels of secondary phase titanium carbide (TiC) particles in an electrolyte of 0.9% sodium chloride at 37 °C. The influence of carbides and thermo-mechanical treatment/cold working on the passivity breakdown is highlighted. The polarisation studies on the as-cast and cold worked NiTi with high (0.05 wt%) and low (0.005 wt%) carbon levels show a significant difference in oxide stability. The alloy with extremely low carbon content shows a higher breakdown potential. Higher carbon levels result in higher density of larger TiC and these carbide/matrix interfaces are more susceptible to pitting. The qualitative behaviour of passive layer formed at 0.5 V on the cold worked NiTi alloy with different carbon levels was ascertained by electrochemical impedance spectroscopy (EIS). The oxide on the NiTi alloy with high (0.05 wt%) carbon levels showed lower resistance and poor stability at this condition. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106402/abstract [article] The influence of secondary phase carbide particles on the passivity behaviour of NiTi shape memory alloys [texte imprimé] / L. Neelakantan, Auteur ; B. Monchev, Auteur ; M. Frotscher, Auteur . - 2014 . - pp. 979–984. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 11 (Novembre 2012) . - pp. 979–984 Mots-clés : Inclusions;  interfaces;  nickel  titanium  shape  memory  alloys;  pitting;  polarisation Résumé : The current investigation aims at studying the passivity behaviour of NiTi shape memory alloys with different levels of secondary phase titanium carbide (TiC) particles in an electrolyte of 0.9% sodium chloride at 37 °C. The influence of carbides and thermo-mechanical treatment/cold working on the passivity breakdown is highlighted. The polarisation studies on the as-cast and cold worked NiTi with high (0.05 wt%) and low (0.005 wt%) carbon levels show a significant difference in oxide stability. The alloy with extremely low carbon content shows a higher breakdown potential. Higher carbon levels result in higher density of larger TiC and these carbide/matrix interfaces are more susceptible to pitting. The qualitative behaviour of passive layer formed at 0.5 V on the cold worked NiTi alloy with different carbon levels was ascertained by electrochemical impedance spectroscopy (EIS). The oxide on the NiTi alloy with high (0.05 wt%) carbon levels showed lower resistance and poor stability at this condition. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106402/abstract

Electrochemical and SEM characterization of NiTi alloy coated with chitosan by PLD technique / D. Mareci in Materials and corrosion, Vol. 63 N° 11 (Novembre 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 11 (Novembre 2012) . - pp. 985–991 Titre : Electrochemical and SEM characterization of NiTi alloy coated with chitosan by PLD technique Type de document : texte imprimé Auteurs : D. Mareci, Auteur ; N. Cimpoesu, Auteur ; M. I. Popa, Auteur Année de publication : 2014 Article en page(s) : pp. 985–991 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Chitosan;  EIS;  NiTi  alloy;  PLD;  SEM Résumé : The production of a wide variety of biocompatible thin films by laser ablation deposed on the biomaterial substrates does not induce inflammatory response and repulsion by the immunization human body. Anodic potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques were used for the study of the electrochemical behavior of coated NiTi with chitosan through pulsed laser deposition (PLD) technique. Experiments were carried out using two different electrolytes: physiological 0.9 wt% NaCl solution (PS) and PS + hydrochloric acid (APS) at 37 ± 1 °C. In addition, scanning electron microscopy was employed to observe the surface morphology after maintaining in both electrolytes. The corrosion resistance was evaluated by means of the corrosion and passive corrosion currents. The electrochemical properties of the coated NiTi sample at the open circuit potential at different immersion time in PS and APS were studied by EIS. Equivalent circuits were used to model EIS data, in order to characterize samples' surface. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201206501/abstract [article] Electrochemical and SEM characterization of NiTi alloy coated with chitosan by PLD technique [texte imprimé] / D. Mareci, Auteur ; N. Cimpoesu, Auteur ; M. I. Popa, Auteur . - 2014 . - pp. 985–991. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 11 (Novembre 2012) . - pp. 985–991 Mots-clés : Chitosan;  EIS;  NiTi  alloy;  PLD;  SEM Résumé : The production of a wide variety of biocompatible thin films by laser ablation deposed on the biomaterial substrates does not induce inflammatory response and repulsion by the immunization human body. Anodic potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques were used for the study of the electrochemical behavior of coated NiTi with chitosan through pulsed laser deposition (PLD) technique. Experiments were carried out using two different electrolytes: physiological 0.9 wt% NaCl solution (PS) and PS + hydrochloric acid (APS) at 37 ± 1 °C. In addition, scanning electron microscopy was employed to observe the surface morphology after maintaining in both electrolytes. The corrosion resistance was evaluated by means of the corrosion and passive corrosion currents. The electrochemical properties of the coated NiTi sample at the open circuit potential at different immersion time in PS and APS were studied by EIS. Equivalent circuits were used to model EIS data, in order to characterize samples' surface. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201206501/abstract

Corrosion behaviour of Ti–Ta–Sn alloy systems in 0.9% NaCl solution / W. Q. Khan in Materials and corrosion, Vol. 63 N° 11 (Novembre 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 11 (Novembre 2012) . - pp. 992–996 Titre : Corrosion behaviour of Ti–Ta–Sn alloy systems in 0.9% NaCl solution Type de document : texte imprimé Auteurs : W. Q. Khan, Auteur ; K. M. Deen, Auteur ; K. M. Ghauri, Auteur Année de publication : 2014 Article en page(s) : pp. 992–996 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Electrochemical;  electrochemical  impedance  spectroscopy;  microstructural;  passive  film;  X-ray  diffraction Résumé : Two alloys of varying contents of tantalum (Ta) and tin (Sn) were prepared and homogenized to evaluate their microstructural and electrochemical characteristics. The microstructural features were revealed through optical microscopy and X-ray diffraction methods. The formation and stability of passive film was studied by open circuit potential, potentiodynamic polarization and electrochemical scratch tests. The electrochemical impedance spectroscopy results simulated with equivalent electrical circuit suggested bilayer structure of outer porous and inner barrier oxide films. The quantitative data showed thick inner barrier oxide film retarded electrochemical reactions at low ‘Ta’ and ‘Sn’ concentration. The increased percentage of ‘Ta’ and ‘Sn’ deteriorated barrier properties by agglomeration of Ta2Sn3 and Ta0.15Ti0.85 precipitates within grains and at the grain boundaries. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201206523/abstract [article] Corrosion behaviour of Ti–Ta–Sn alloy systems in 0.9% NaCl solution [texte imprimé] / W. Q. Khan, Auteur ; K. M. Deen, Auteur ; K. M. Ghauri, Auteur . - 2014 . - pp. 992–996. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 11 (Novembre 2012) . - pp. 992–996 Mots-clés : Electrochemical;  electrochemical  impedance  spectroscopy;  microstructural;  passive  film;  X-ray  diffraction Résumé : Two alloys of varying contents of tantalum (Ta) and tin (Sn) were prepared and homogenized to evaluate their microstructural and electrochemical characteristics. The microstructural features were revealed through optical microscopy and X-ray diffraction methods. The formation and stability of passive film was studied by open circuit potential, potentiodynamic polarization and electrochemical scratch tests. The electrochemical impedance spectroscopy results simulated with equivalent electrical circuit suggested bilayer structure of outer porous and inner barrier oxide films. The quantitative data showed thick inner barrier oxide film retarded electrochemical reactions at low ‘Ta’ and ‘Sn’ concentration. The increased percentage of ‘Ta’ and ‘Sn’ deteriorated barrier properties by agglomeration of Ta2Sn3 and Ta0.15Ti0.85 precipitates within grains and at the grain boundaries. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201206523/abstract

Influence of microstructure on mechanical properties and corrosion behavior of 3%Cr steel in CO2 environment / L. N. Xu in Materials and corrosion, Vol. 63 N° 11 (Novembre 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 11 (Novembre 2012) . - pp. 997–1003 Titre : Influence of microstructure on mechanical properties and corrosion behavior of 3%Cr steel in CO2 environment Type de document : texte imprimé Auteurs : L. N. Xu, Auteur ; S. Q. Guo, Auteur ; C. L. Gao, Auteur Année de publication : 2014 Article en page(s) : pp. 997–1003 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Chromium  bearing  steel;  CO2  corrosion;  corrosion  behavior;  mechanical  property;  microstructure Résumé : Corrosion behavior and mechanical properties of two 3%Cr pipeline steels were studied which have same chemical compositions but different microstructures, bainite-ferrite and ferrite-pearlite microstructures. Analysis of chemical compositions and surface morphology of the corrosion scale were performed using X-ray diffraction and scanning electron microscopy in conjunction with energy dispersive X-ray spectroscopy. The semi-passive character of corrosion scale was investigated using polarization curves measurements. The influence of microstructure on the chromium enrichment in the corrosion scale for different test periods was investigated. The microstructure was observed to affect the corrosion behavior even when the steel surface has been covered with corrosion scales and continue to have an effect until the corrosion scale possessing semi-passive character. Possessing both good strength and corrosion resistance, 3%Cr steel with bainite-ferrite microstructure was very promising for pipeline steel applications. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106389/abstract [article] Influence of microstructure on mechanical properties and corrosion behavior of 3%Cr steel in CO2 environment [texte imprimé] / L. N. Xu, Auteur ; S. Q. Guo, Auteur ; C. L. Gao, Auteur . - 2014 . - pp. 997–1003. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 11 (Novembre 2012) . - pp. 997–1003 Mots-clés : Chromium  bearing  steel;  CO2  corrosion;  corrosion  behavior;  mechanical  property;  microstructure Résumé : Corrosion behavior and mechanical properties of two 3%Cr pipeline steels were studied which have same chemical compositions but different microstructures, bainite-ferrite and ferrite-pearlite microstructures. Analysis of chemical compositions and surface morphology of the corrosion scale were performed using X-ray diffraction and scanning electron microscopy in conjunction with energy dispersive X-ray spectroscopy. The semi-passive character of corrosion scale was investigated using polarization curves measurements. The influence of microstructure on the chromium enrichment in the corrosion scale for different test periods was investigated. The microstructure was observed to affect the corrosion behavior even when the steel surface has been covered with corrosion scales and continue to have an effect until the corrosion scale possessing semi-passive character. Possessing both good strength and corrosion resistance, 3%Cr steel with bainite-ferrite microstructure was very promising for pipeline steel applications. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106389/abstract

Effect of aluminum on the corrosion resistance of low-alloy steel in 10 wt% sulfuric acid solution / N. D. Nam in Materials and corrosion, Vol. 63 N° 11 (Novembre 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 11 (Novembre 2012) . - pp. 1004–1010 Titre : Effect of aluminum on the corrosion resistance of low-alloy steel in 10 wt% sulfuric acid solution Type de document : texte imprimé Auteurs : N. D. Nam, Auteur ; W. C. Kim, Auteur ; J.-G. Kim, Auteur Année de publication : 2014 Article en page(s) : pp. 1004–1010 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Acid  corrosion;  aluminum;  electrochemical  impedance  spectroscopy;  low-alloy  steel;  potentiodynamic Résumé : The aqueous corrosion behavior of low-alloy steel with aluminum contents was examined in a 10 wt% H2SO4 (pH 0.13) solution using electrochemical techniques and surface analyses. The corrosion resistance of the new alloy steel was evaluated in terms of electrochemical parameters, such as passive current density, film, and charge transfer resistances. The results showed that a high Al content in the steel imparted better passivation behavior resulting in a lower corrosion rate. It related to the enrichment of iron carbonate and hydrocarbon by the dissolution of the carbide phase. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106351/abstract [article] Effect of aluminum on the corrosion resistance of low-alloy steel in 10 wt% sulfuric acid solution [texte imprimé] / N. D. Nam, Auteur ; W. C. Kim, Auteur ; J.-G. Kim, Auteur . - 2014 . - pp. 1004–1010. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 11 (Novembre 2012) . - pp. 1004–1010 Mots-clés : Acid  corrosion;  aluminum;  electrochemical  impedance  spectroscopy;  low-alloy  steel;  potentiodynamic Résumé : The aqueous corrosion behavior of low-alloy steel with aluminum contents was examined in a 10 wt% H2SO4 (pH 0.13) solution using electrochemical techniques and surface analyses. The corrosion resistance of the new alloy steel was evaluated in terms of electrochemical parameters, such as passive current density, film, and charge transfer resistances. The results showed that a high Al content in the steel imparted better passivation behavior resulting in a lower corrosion rate. It related to the enrichment of iron carbonate and hydrocarbon by the dissolution of the carbide phase. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106351/abstract

An embedded multi-parameter corrosion sensor for reinforced concrete structures / H. Yu in Materials and corrosion, Vol. 63 N° 11 (Novembre 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 11 (Novembre 2012) . - pp. 1011–1016 Titre : An embedded multi-parameter corrosion sensor for reinforced concrete structures Type de document : texte imprimé Auteurs : H. Yu, Auteur ; L. Caseres, Auteur Année de publication : 2014 Article en page(s) : pp. 1011–1016 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Chloride  threshold  concentration;  corrosion  sensor;  linear  polarization  resistance  (LPR);  reinforcing  steel  bar  (rebar);  simulated  pore  solutions  (SPSs) Résumé : A prototype of an embedded corrosion sensor has been developed for assessing the corrosion status of reinforcing steel bar (rebar) in concrete. The integrated sensor unit includes an Ag/AgCl probe, a metallic oxide probe, a multi-electrode array sensor (MAS), and a four-pin (Wenner) array stainless steel electrode for chloride content, pH, microcell corrosion current, and localized concrete resistivity measurements, respectively. A stable solid probe was used as the reference probe in this unit to express the potentiometric measurement of chloride content and pH probes. In this study, the chloride and pH probes were calibrated in simulated pore solutions (SPSs) regarding temperature and pH fluctuations. The corrosion current results of the MAS probe in SPSs matched very well with those obtained by the linear polarization resistance technique, which was conducted on companion carbon steel specimens. A sensor prototype was embedded into a paste cylinder for long-term performance evaluation. Up-to-date results show that the sensor probes exhibit excellent sensitivity and reliability through 1 year of monitoring. Continuous monitoring in the laboratory for extended periods is underway. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106113/abstract [article] An embedded multi-parameter corrosion sensor for reinforced concrete structures [texte imprimé] / H. Yu, Auteur ; L. Caseres, Auteur . - 2014 . - pp. 1011–1016. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 11 (Novembre 2012) . - pp. 1011–1016 Mots-clés : Chloride  threshold  concentration;  corrosion  sensor;  linear  polarization  resistance  (LPR);  reinforcing  steel  bar  (rebar);  simulated  pore  solutions  (SPSs) Résumé : A prototype of an embedded corrosion sensor has been developed for assessing the corrosion status of reinforcing steel bar (rebar) in concrete. The integrated sensor unit includes an Ag/AgCl probe, a metallic oxide probe, a multi-electrode array sensor (MAS), and a four-pin (Wenner) array stainless steel electrode for chloride content, pH, microcell corrosion current, and localized concrete resistivity measurements, respectively. A stable solid probe was used as the reference probe in this unit to express the potentiometric measurement of chloride content and pH probes. In this study, the chloride and pH probes were calibrated in simulated pore solutions (SPSs) regarding temperature and pH fluctuations. The corrosion current results of the MAS probe in SPSs matched very well with those obtained by the linear polarization resistance technique, which was conducted on companion carbon steel specimens. A sensor prototype was embedded into a paste cylinder for long-term performance evaluation. Up-to-date results show that the sensor probes exhibit excellent sensitivity and reliability through 1 year of monitoring. Continuous monitoring in the laboratory for extended periods is underway. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106113/abstract

The synergistic effect of Na3PO4 and benzotriazole on the inhibition of copper corrosion in tetra-n-butylammonium bromide aerated aqueous solution / S. Liu in Materials and corrosion, Vol. 63 N° 11 (Novembre 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 11 (Novembre 2012) . - pp. 1017–1025 Titre : The synergistic effect of Na3PO4 and benzotriazole on the inhibition of copper corrosion in tetra-n-butylammonium bromide aerated aqueous solution Type de document : texte imprimé Auteurs : S. Liu, Auteur ; Dong, J., Auteur ; W. W. Guan, Auteur Année de publication : 2014 Article en page(s) : pp. 1017–1025 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Benzotriazole;  copper;  inhibition;  sodium  phosphate;  tetra-n-butylammonium  bromide Résumé : The effect of Na3PO4 and the mixture of benzotriazole (BTA) and Na3PO4 (SP) on the corrosion of copper in 17 wt% (0.534 mol/L) tetra-n-butylammonium bromide (TBAB) aerated aqueous solution has been investigated by means of weight-loss test, potentiodynamic polarization test, electrochemical impedance spectroscopy (EIS), and scanning electron microscopy/energy dispersive X-ray techniques. The experimental results showed that a dosage of Na3PO4 stimulated the copper corrosion, and the corrosion rate increased with increasing Na3PO4 concentration, whereas the mixture of BTA and Na3PO4 could protect copper in aqueous TBAB solution. The inhibition action of the mixture of BTA and Na3PO4 on the corrosion of copper is mainly due to the inhibition of the anodic process of corrosion. The inhibition efficiency of a mixture consisting of 2 g/L BTA and 1 g/L Na3PO4 was about 96%. The mixture of BTA and Na3PO4 inhibits the corrosion of copper better than BTA by itself, indicating that Na3PO4 has a synergistic role with BTA on the corrosion inhibition of copper in TBAB aqueous solution. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106346/abstract [article] The synergistic effect of Na3PO4 and benzotriazole on the inhibition of copper corrosion in tetra-n-butylammonium bromide aerated aqueous solution [texte imprimé] / S. Liu, Auteur ; Dong, J., Auteur ; W. W. Guan, Auteur . - 2014 . - pp. 1017–1025. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 11 (Novembre 2012) . - pp. 1017–1025 Mots-clés : Benzotriazole;  copper;  inhibition;  sodium  phosphate;  tetra-n-butylammonium  bromide Résumé : The effect of Na3PO4 and the mixture of benzotriazole (BTA) and Na3PO4 (SP) on the corrosion of copper in 17 wt% (0.534 mol/L) tetra-n-butylammonium bromide (TBAB) aerated aqueous solution has been investigated by means of weight-loss test, potentiodynamic polarization test, electrochemical impedance spectroscopy (EIS), and scanning electron microscopy/energy dispersive X-ray techniques. The experimental results showed that a dosage of Na3PO4 stimulated the copper corrosion, and the corrosion rate increased with increasing Na3PO4 concentration, whereas the mixture of BTA and Na3PO4 could protect copper in aqueous TBAB solution. The inhibition action of the mixture of BTA and Na3PO4 on the corrosion of copper is mainly due to the inhibition of the anodic process of corrosion. The inhibition efficiency of a mixture consisting of 2 g/L BTA and 1 g/L Na3PO4 was about 96%. The mixture of BTA and Na3PO4 inhibits the corrosion of copper better than BTA by itself, indicating that Na3PO4 has a synergistic role with BTA on the corrosion inhibition of copper in TBAB aqueous solution. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201106346/abstract

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