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Materials and corrosion |
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Ajouter le résultat dans votre panierInfluence of MWCNT dispersion on corrosion behaviour of their Mg composites / Q. Li in Materials and corrosion, Vol. 63 N° 5 (Mai 2012)
in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 384–387
Titre : Influence of MWCNT dispersion on corrosion behaviour of their Mg composites Type de document : texte imprimé Auteurs : Q. Li, Auteur ; M. C. Turhan, Auteur ; C. A. Rottmair, Auteur Année de publication : 2012 Article en page(s) : pp. 384–387 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : CNT dispersion; corrosion; magnesium alloys; metal matrix composites; multiwall carbon nanotubes Résumé : Carbon nanotubes (CNTs) have been demonstrated as good reinforcements to improve mechanical properties of magnesium alloys. This study reports on the influence of CNT dispersion on corrosion behaviour of their Mg composites. Experiments revealed that the corrosion rate is drastically increased by adding CNTs to the magnesium alloy due to galvanic coupling. Moreover, a homogeneous CNT dispersion leads to reduced corrosion resistivity. Surface pre-treatment is also found to be critical for the corrosion performance for both 1 and 5 wt% CNT composites. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006023/abstract [article] Influence of MWCNT dispersion on corrosion behaviour of their Mg composites [texte imprimé] / Q. Li, Auteur ; M. C. Turhan, Auteur ; C. A. Rottmair, Auteur . - 2012 . - pp. 384–387.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 384–387
Mots-clés : CNT dispersion; corrosion; magnesium alloys; metal matrix composites; multiwall carbon nanotubes Résumé : Carbon nanotubes (CNTs) have been demonstrated as good reinforcements to improve mechanical properties of magnesium alloys. This study reports on the influence of CNT dispersion on corrosion behaviour of their Mg composites. Experiments revealed that the corrosion rate is drastically increased by adding CNTs to the magnesium alloy due to galvanic coupling. Moreover, a homogeneous CNT dispersion leads to reduced corrosion resistivity. Surface pre-treatment is also found to be critical for the corrosion performance for both 1 and 5 wt% CNT composites. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201006023/abstract
in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 388–395
Titre : Corrosion of stainless steels in simulated diesel exhaust environment with urea Type de document : texte imprimé Auteurs : J. Nockert, Auteur ; L. Nyborg, Auteur ; M. Norell, Auteur Année de publication : 2012 Article en page(s) : pp. 388–395 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : AES; diesel exhaust; high temperature corrosion; SCR; stainless steel; urea; XPS Résumé : Laboratory exposures have been performed simulating a selective catalytic reduction (SCR) system with urea injection for NOx reduction in diesel exhaust after-treatment. The corrosion behaviour of three ferritic and one austenitic stainless steel was examined using X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES). Continuous exposure to condensate did not cause any corrosion. Results show that cyclic interaction between high temperature and condensation aggravates the corrosion compared to isothermal exposure at 450 °C. All ferritic alloys exhibited more or less the same behaviour, while the austenitic steel performed better. In fact, the presence of urea decreased the corrosion compared to the environment without urea. The cyclic samples exposed with urea displayed iron sulphate on the surface. The sulphate appeared to decrease the oxide thickness. A sulphur enrichment in the form of sulphide also occurred in the inner chromium-rich oxides of all cyclically exposed samples, both with and without urea. Thus, sulphidation is presumed to be involved in the corrosion process. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005783/abstract [article] Corrosion of stainless steels in simulated diesel exhaust environment with urea [texte imprimé] / J. Nockert, Auteur ; L. Nyborg, Auteur ; M. Norell, Auteur . - 2012 . - pp. 388–395.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 388–395
Mots-clés : AES; diesel exhaust; high temperature corrosion; SCR; stainless steel; urea; XPS Résumé : Laboratory exposures have been performed simulating a selective catalytic reduction (SCR) system with urea injection for NOx reduction in diesel exhaust after-treatment. The corrosion behaviour of three ferritic and one austenitic stainless steel was examined using X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES). Continuous exposure to condensate did not cause any corrosion. Results show that cyclic interaction between high temperature and condensation aggravates the corrosion compared to isothermal exposure at 450 °C. All ferritic alloys exhibited more or less the same behaviour, while the austenitic steel performed better. In fact, the presence of urea decreased the corrosion compared to the environment without urea. The cyclic samples exposed with urea displayed iron sulphate on the surface. The sulphate appeared to decrease the oxide thickness. A sulphur enrichment in the form of sulphide also occurred in the inner chromium-rich oxides of all cyclically exposed samples, both with and without urea. Thus, sulphidation is presumed to be involved in the corrosion process. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005783/abstract
in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 396–400
Titre : Hot dip galvanizing behavior of advanced high strength steel Type de document : texte imprimé Auteurs : F. Li, Auteur ; Liu, H., Auteur ; W. Shi, Auteur Année de publication : 2012 Article en page(s) : pp. 396–400 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : AHSS; galvanizability; selective oxidation; Thermo-Calc Résumé : This work studied the hot dip galvanizing behavior of three advanced high strength steels annealed under different protective atmospheres. The coating quality, surface oxides, and the mechanical property of steel matrix were examined. The experimental results show that annealing atmosphere can influence the galvanizability and thermodynamics calculation can predict the surface selective oxidation. It was shown for the first time in this work that annealing atmosphere may also influence the mechanical property of the steel matrix. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005905/abstract [article] Hot dip galvanizing behavior of advanced high strength steel [texte imprimé] / F. Li, Auteur ; Liu, H., Auteur ; W. Shi, Auteur . - 2012 . - pp. 396–400.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 396–400
Mots-clés : AHSS; galvanizability; selective oxidation; Thermo-Calc Résumé : This work studied the hot dip galvanizing behavior of three advanced high strength steels annealed under different protective atmospheres. The coating quality, surface oxides, and the mechanical property of steel matrix were examined. The experimental results show that annealing atmosphere can influence the galvanizability and thermodynamics calculation can predict the surface selective oxidation. It was shown for the first time in this work that annealing atmosphere may also influence the mechanical property of the steel matrix. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005905/abstract
in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 401–407
Titre : Influence of tensile stress on corrosion behaviour of high-strength galvanized steel bridge wires in simulated acid rain Type de document : texte imprimé Auteurs : W. J. Yang, Auteur ; P. Yang, Auteur ; X. M. Li, Auteur Année de publication : 2012 Article en page(s) : pp. 401–407 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Corrosion; Galvanized steel wire; Simulated acid rain; Tensile stress Résumé : Corrosion behaviour of the high-strength galvanized steel wires under tensile stress was researched by electrochemical polarization and salt spray test (SST) using simulated acid rain as electrolyte. Electrochemical polarization and SST results showed corrosion rate rose significantly with increasing tensile stress; white grains were observed by SEM after polarization, while cellular and dendritic crystals appeared on the rust layer after SST. XRD and TG-DTA results revealed (Zn(OH)2)3 · ZnSO4 · 5H2O was the main corrosion product, and traces of Fe2(SO4)2O · 7H2O, Fe2(SO4)3, Fe2O3 · H2O were also detected. A three-stage corrosion process for the galvanized steel wires during SST was proposed. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005921/abstract [article] Influence of tensile stress on corrosion behaviour of high-strength galvanized steel bridge wires in simulated acid rain [texte imprimé] / W. J. Yang, Auteur ; P. Yang, Auteur ; X. M. Li, Auteur . - 2012 . - pp. 401–407.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 401–407
Mots-clés : Corrosion; Galvanized steel wire; Simulated acid rain; Tensile stress Résumé : Corrosion behaviour of the high-strength galvanized steel wires under tensile stress was researched by electrochemical polarization and salt spray test (SST) using simulated acid rain as electrolyte. Electrochemical polarization and SST results showed corrosion rate rose significantly with increasing tensile stress; white grains were observed by SEM after polarization, while cellular and dendritic crystals appeared on the rust layer after SST. XRD and TG-DTA results revealed (Zn(OH)2)3 · ZnSO4 · 5H2O was the main corrosion product, and traces of Fe2(SO4)2O · 7H2O, Fe2(SO4)3, Fe2O3 · H2O were also detected. A three-stage corrosion process for the galvanized steel wires during SST was proposed. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005921/abstract
in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 408–415
Titre : Corrosion performance and mechanical properties of joined automotive materials Type de document : texte imprimé Auteurs : N. LeBozec, Auteur ; A. LeGac, Auteur ; D. Thierry, Auteur Année de publication : 2012 Article en page(s) : pp. 408–415 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : adhesive bonding; automotive; clinching; corrosion; joint strength; welding Résumé : The automotive industry envisions that an optimized vehicle in terms of performance and cost can be achieved only by using different materials at different vehicle locations in order to utilize the functionality of the different materials to a full extent. Currently, steel and aluminum are the most important construction materials for the mass production of automotive structure. However, other materials such as magnesium alloys and stainless steel are also used. The use of dissymmetric assemblies of materials in the automotive industry has also led to the development of joining technologies other than spot welding and arc welding such as clinching, adhesive bonding, laser welding, and MIG brazing. However, and despite the development of these new joining technologies, there are still important gaps of knowledge with regards to the corrosion performance of different joint populations using dissymmetric and symmetric materials. Materials commonly used in the automotive industry including steel and aluminum-based susbtrates were assembled with different combinations using various joining techniques in order to evaluate their corrosion performance as well their mechanical properties after cyclic accelerated corrosion tests. The results indicated a relationship between the corrosion inside the confined joint and the decrease of the mechanical properties of the assemblies. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005888/abstract [article] Corrosion performance and mechanical properties of joined automotive materials [texte imprimé] / N. LeBozec, Auteur ; A. LeGac, Auteur ; D. Thierry, Auteur . - 2012 . - pp. 408–415.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 408–415
Mots-clés : adhesive bonding; automotive; clinching; corrosion; joint strength; welding Résumé : The automotive industry envisions that an optimized vehicle in terms of performance and cost can be achieved only by using different materials at different vehicle locations in order to utilize the functionality of the different materials to a full extent. Currently, steel and aluminum are the most important construction materials for the mass production of automotive structure. However, other materials such as magnesium alloys and stainless steel are also used. The use of dissymmetric assemblies of materials in the automotive industry has also led to the development of joining technologies other than spot welding and arc welding such as clinching, adhesive bonding, laser welding, and MIG brazing. However, and despite the development of these new joining technologies, there are still important gaps of knowledge with regards to the corrosion performance of different joint populations using dissymmetric and symmetric materials. Materials commonly used in the automotive industry including steel and aluminum-based susbtrates were assembled with different combinations using various joining techniques in order to evaluate their corrosion performance as well their mechanical properties after cyclic accelerated corrosion tests. The results indicated a relationship between the corrosion inside the confined joint and the decrease of the mechanical properties of the assemblies. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005888/abstract
in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 416–420
Titre : A zinc/silicon dioxide composite film: Fabrication and anti-corrosion characterization Type de document : texte imprimé Auteurs : Z. F. Lin, Auteur ; D. Zhang, Auteur ; Y. Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 416–420 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Carbon steel; composite film; EIS; polarization Résumé : A zinc/silicon dioxide composite film has been electrodeposited on carbon steel surface via adding tetraethylorthosilicate (TEOS) in zinc nitrate solution. The advantage of this method is that the metal/inorganic composite film can be fabricated without adding solid particles in solution. Polarization curve results showed that the composite film obtained at a TEOS concentration of 0.012 M had the best corrosion resistance. Electrochemical impedance spectroscopy results indicated that this film had a corrosion protection effect in 3.5 wt% sodium chloride solution for hundreds of hours. This kind of composite film can be potentially applied as anti-corrosion coating for metal corrosion protection. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005974/abstract [article] A zinc/silicon dioxide composite film: Fabrication and anti-corrosion characterization [texte imprimé] / Z. F. Lin, Auteur ; D. Zhang, Auteur ; Y. Wang, Auteur . - 2012 . - pp. 416–420.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 416–420
Mots-clés : Carbon steel; composite film; EIS; polarization Résumé : A zinc/silicon dioxide composite film has been electrodeposited on carbon steel surface via adding tetraethylorthosilicate (TEOS) in zinc nitrate solution. The advantage of this method is that the metal/inorganic composite film can be fabricated without adding solid particles in solution. Polarization curve results showed that the composite film obtained at a TEOS concentration of 0.012 M had the best corrosion resistance. Electrochemical impedance spectroscopy results indicated that this film had a corrosion protection effect in 3.5 wt% sodium chloride solution for hundreds of hours. This kind of composite film can be potentially applied as anti-corrosion coating for metal corrosion protection. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005974/abstract
in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 421–430
Titre : Influence of heat treatment on corrosion behaviour of Al_Zn_Mg_Cu_Zr_Sc alloy Type de document : texte imprimé Auteurs : Y. P. Xiao, Auteur ; Q. L. Pan, Auteur ; W.B. Li, Auteur Année de publication : 2012 Article en page(s) : pp. 421–430 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Al_Zn_Mg_Cu_Zr_Sc alloy; exfoliation corrosion; heat treatment; electrochemical impedance spectroscopy; polarization Résumé : Corrosion behaviour of different tempers (namely NA, UA, PA and OA) of Al_Zn_Mg_Cu_Zr_Sc alloy was studied by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), optical microscopy (OM) and transmission electron microscopy (TEM). Over aged (OA) can decrease the susceptibility to exfoliation due to the discontinuous distribution of the η precipitates at the grain boundaries, cause a negative shift of the corrosion potential (Ecorr) and lead to the prolonging of the time of the appearance of two time constants in impedance diagrams. In addition, Al_Zn_Mg_Cu_Zr_Sc alloy with over aged treatment has an enhanced resistance to exfoliation corrosion. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005923/abstract [article] Influence of heat treatment on corrosion behaviour of Al_Zn_Mg_Cu_Zr_Sc alloy [texte imprimé] / Y. P. Xiao, Auteur ; Q. L. Pan, Auteur ; W.B. Li, Auteur . - 2012 . - pp. 421–430.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 421–430
Mots-clés : Al_Zn_Mg_Cu_Zr_Sc alloy; exfoliation corrosion; heat treatment; electrochemical impedance spectroscopy; polarization Résumé : Corrosion behaviour of different tempers (namely NA, UA, PA and OA) of Al_Zn_Mg_Cu_Zr_Sc alloy was studied by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), optical microscopy (OM) and transmission electron microscopy (TEM). Over aged (OA) can decrease the susceptibility to exfoliation due to the discontinuous distribution of the η precipitates at the grain boundaries, cause a negative shift of the corrosion potential (Ecorr) and lead to the prolonging of the time of the appearance of two time constants in impedance diagrams. In addition, Al_Zn_Mg_Cu_Zr_Sc alloy with over aged treatment has an enhanced resistance to exfoliation corrosion. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005923/abstract
in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 431–437
Titre : Effect of sulphate reducing bacteria on corrosion of Al_Zn_In_Sn sacrificial anodes in marine sediment Type de document : texte imprimé Auteurs : F. Liu, Auteur ; J. Zhang, Auteur ; S. Zhang, Auteur Année de publication : 2012 Article en page(s) : pp. 431–437 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Metals and alloys; corrosion; electrochemical impedance spectroscopy (EIS); scanning electron microscopy (SEM) Résumé : Microbiologically influenced corrosion (MIC) of Al_Zn_In_Sn sacrificial anodes in marine sediment was investigated by exposing samples to sulphate reducing bacteria (SRB). Samples exposed to the sterile marine sediment were used as control. The results show that pitting corrosion occurs in both the sterile marine sediment and the SRB-containing marine sediment. However, the corrosion can be increased sharply by the SRB metabolic activity due to the cathodic depolarization effect. In fact, the effect is based on the consumption of hydrogen which probably results in the acceleration of galvanic corrosion between corrosion products and metal substrate. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005955/abstract [article] Effect of sulphate reducing bacteria on corrosion of Al_Zn_In_Sn sacrificial anodes in marine sediment [texte imprimé] / F. Liu, Auteur ; J. Zhang, Auteur ; S. Zhang, Auteur . - 2012 . - pp. 431–437.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 431–437
Mots-clés : Metals and alloys; corrosion; electrochemical impedance spectroscopy (EIS); scanning electron microscopy (SEM) Résumé : Microbiologically influenced corrosion (MIC) of Al_Zn_In_Sn sacrificial anodes in marine sediment was investigated by exposing samples to sulphate reducing bacteria (SRB). Samples exposed to the sterile marine sediment were used as control. The results show that pitting corrosion occurs in both the sterile marine sediment and the SRB-containing marine sediment. However, the corrosion can be increased sharply by the SRB metabolic activity due to the cathodic depolarization effect. In fact, the effect is based on the consumption of hydrogen which probably results in the acceleration of galvanic corrosion between corrosion products and metal substrate. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005955/abstract
in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 438–444
Titre : Alternative methods for copper corrosion studies in household plumbing systems Type de document : texte imprimé Auteurs : A. Armanious, Auteur ; K Johannsen, Auteur Année de publication : 2012 Article en page(s) : pp. 438–444 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Copper; corrosion; malachite; corrosion testing; water; kinetics; DOC; phosphate; chlorination Résumé : Copper corrosion poses a serious challenge to the practice of using copper pipes in household plumbing installations. Copper corrosion can cause health, aesthetic and economic problems. Pipe rig experiments have always been used to study copper corrosion. But the long duration of such experiments, which can last for up to six months, makes them tedious and relatively expensive, thereby limiting the progress of copper corrosion research. The purpose of this study is to establish a laboratory scale experimental setup that takes less time and can be used to study the kinetics of the processes involved in copper corrosion. The developed setup offers a promising alternative to studying copper corrosion using experiments that last for just 24 hours. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005796/abstract [article] Alternative methods for copper corrosion studies in household plumbing systems [texte imprimé] / A. Armanious, Auteur ; K Johannsen, Auteur . - 2012 . - pp. 438–444.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 438–444
Mots-clés : Copper; corrosion; malachite; corrosion testing; water; kinetics; DOC; phosphate; chlorination Résumé : Copper corrosion poses a serious challenge to the practice of using copper pipes in household plumbing installations. Copper corrosion can cause health, aesthetic and economic problems. Pipe rig experiments have always been used to study copper corrosion. But the long duration of such experiments, which can last for up to six months, makes them tedious and relatively expensive, thereby limiting the progress of copper corrosion research. The purpose of this study is to establish a laboratory scale experimental setup that takes less time and can be used to study the kinetics of the processes involved in copper corrosion. The developed setup offers a promising alternative to studying copper corrosion using experiments that last for just 24 hours. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005796/abstract
in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 445–455
Titre : Generation of nanocrystalline NiO particles by solution combustion method and its Zn_NiO composite coating for corrosion protection Type de document : texte imprimé Auteurs : K. G. Chandrappa, Auteur ; T.V. Venkatesha, Auteur ; K.O. Nayana, Auteur Année de publication : 2012 Article en page(s) : pp. 445–455 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Composite coating; corrosion; heat treatment; impedance; nanocrystalline; nickel oxide; TEM; XRD Résumé : The nanocrystalline nickel oxide (NiO) particles have been successfully prepared by a simple, fast, economical, and eco-friendly solution-combustion method using Ni(NO3)2· 6H2O (oxidizer) and sugar (dextrose as fuel). The as-prepared compound was calcined for an hour at different temperatures. The synthesized NiO was characterized by XRD, TGA, SEM/EDX, TEM, XPS, FT-IR, and UV–Vis spectral methods. The crystallite sizes of the NiO particles were measured. Rietveld refinement of X-ray data matches the cubic structure with space group of Fm3m (No. 225). The thermal behavior of as-prepared compound was examined. Scanning electron micrographs show uniform cubic like morphology of NiO and its chemical composition was measured. The TEM results reveal that the particle sizes were in the order of 70–80 nm. The red shift was noticed in UV–Vis absorption spectra. As an application part the Zn_NiO composite coating was prepared by electrodeposition method and its corrosion behavior was analyzed by Tafel, impedance and anodic polarization in aggressive medium. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005966/abstract [article] Generation of nanocrystalline NiO particles by solution combustion method and its Zn_NiO composite coating for corrosion protection [texte imprimé] / K. G. Chandrappa, Auteur ; T.V. Venkatesha, Auteur ; K.O. Nayana, Auteur . - 2012 . - pp. 445–455.
Génie mécanique
Langues : Anglais (eng)
in Materials and corrosion > Vol. 63 N° 5 (Mai 2012) . - pp. 445–455
Mots-clés : Composite coating; corrosion; heat treatment; impedance; nanocrystalline; nickel oxide; TEM; XRD Résumé : The nanocrystalline nickel oxide (NiO) particles have been successfully prepared by a simple, fast, economical, and eco-friendly solution-combustion method using Ni(NO3)2· 6H2O (oxidizer) and sugar (dextrose as fuel). The as-prepared compound was calcined for an hour at different temperatures. The synthesized NiO was characterized by XRD, TGA, SEM/EDX, TEM, XPS, FT-IR, and UV–Vis spectral methods. The crystallite sizes of the NiO particles were measured. Rietveld refinement of X-ray data matches the cubic structure with space group of Fm3m (No. 225). The thermal behavior of as-prepared compound was examined. Scanning electron micrographs show uniform cubic like morphology of NiO and its chemical composition was measured. The TEM results reveal that the particle sizes were in the order of 70–80 nm. The red shift was noticed in UV–Vis absorption spectra. As an application part the Zn_NiO composite coating was prepared by electrodeposition method and its corrosion behavior was analyzed by Tafel, impedance and anodic polarization in aggressive medium. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005966/abstract
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