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4-Chloro-benzoic acid [1,2,4]triazol-1-ylmethyl ester as an effective inhibitor of mild steel corrosion in HCl solution / Z. Tao in Materials and corrosion, Vol. 61 N° 10 (Octobre 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 10 (Octobre 2010) . - pp. 877–884 Titre : 4-Chloro-benzoic acid [1,2,4]triazol-1-ylmethyl ester as an effective inhibitor of mild steel corrosion in HCl solution Type de document : texte imprimé Auteurs : Z. Tao, Auteur ; S. Zhang, Auteur ; W. Li, Auteur Année de publication : 2011 Article en page(s) : pp. 877–884 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Corrosion  inhibition;  corrosion  test;  electrochemical  techniques;  electron  microscopy Résumé : 4-Chloro-benzoic acid [1,2,4]triazol-1-ylmethyl ester (CBT) was synthesized and its inhibiting action on the corrosion of mild steel in 1 M hydrochloric acid solutions was investigated by means of weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and scanning electron microscope (SEM). The results showed that CBT is an excellent inhibitor for mild steel in acid medium and its inhibition efficiency (IE%) is up to 90.2% at a concentration of 10−3 M at 298 K. EIS showed that the charge transfer controls the corrosion process in the uninhibited and inhibited solutions. Potentiodynamic polarization studies clearly reveal that CBT acts essentially as mixed-type inhibitor. Thermodynamic parameters such as adsorption heat (), adsorption entropy (), and adsorption free energy En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905291/abstract [article] 4-Chloro-benzoic acid [1,2,4]triazol-1-ylmethyl ester as an effective inhibitor of mild steel corrosion in HCl solution [texte imprimé] / Z. Tao, Auteur ; S. Zhang, Auteur ; W. Li, Auteur . - 2011 . - pp. 877–884. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 10 (Octobre 2010) . - pp. 877–884 Mots-clés : Corrosion  inhibition;  corrosion  test;  electrochemical  techniques;  electron  microscopy Résumé : 4-Chloro-benzoic acid [1,2,4]triazol-1-ylmethyl ester (CBT) was synthesized and its inhibiting action on the corrosion of mild steel in 1 M hydrochloric acid solutions was investigated by means of weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and scanning electron microscope (SEM). The results showed that CBT is an excellent inhibitor for mild steel in acid medium and its inhibition efficiency (IE%) is up to 90.2% at a concentration of 10−3 M at 298 K. EIS showed that the charge transfer controls the corrosion process in the uninhibited and inhibited solutions. Potentiodynamic polarization studies clearly reveal that CBT acts essentially as mixed-type inhibitor. Thermodynamic parameters such as adsorption heat (), adsorption entropy (), and adsorption free energy En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905291/abstract

Conditions for early cretaceous emerald formation at Dyakou, China / G. Xue in Economic geology, Vol. 105 N° 2 (Mars/Avril 2010) 

Public ISBD [article]  in Economic geology > Vol. 105 N° 2 (Mars/Avril 2010) . - pp. 339-349 Titre : Conditions for early cretaceous emerald formation at Dyakou, China : fluid inclusion, Ar-Ar, and stable isotope studies Type de document : texte imprimé Auteurs : G. Xue, Auteur ; D. Marshall, Auteur ; S. Zhang, Auteur Année de publication : 2011 Article en page(s) : pp. 339-349 Note générale : Econopmic geology Langues : Anglais (eng) Mots-clés : Emerald  formation  Fluid  inclusion  Isotope  China Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : The Dyakou emerald occurrence is located in Malipo County in the province of Yunnan, southern China. The occurrence lies in the northern part of the Laojunshan-Song Chay metamorphic core complex, which is exposed in an area of approximately 2,000 km2 and extends across the border between China and Vietnam. Emerald mineralization is hosted by pegmatite and associated quartz veins that intrude deformed Proterozoic biotite-muscovite granofels and schist. Hydrogen and oxygen isotope results from the emerald channel waters and emerald, respectively, are consistent with an igneous fluid source. The δ18O fractionation between emerald and quartz yields vein temperatures of 365° to 420°C. Fluid inclusions indicate that the emerald precipitated from saline brines ranging from almost pure water to 10.5 mass percent NaCl equiv. Fluid inclusion isochores intersected with δ18O data yield pressures changing along the geothermal gradient from 1,500 to 3,300 bars. Ar-Ar geochronology of biotite and muscovite from the emerald veins yields consistent ages of 124 ± 1 Ma. These constraints combined with field observations indicate that the Dyakou emerald deposit is consistent with the igneous-related model for emerald formation. DEWEY : 553 ISSN : 0361-0128 En ligne : http://econgeol.geoscienceworld.org/content/105/2/339.abstract [article] Conditions for early cretaceous emerald formation at Dyakou, China : fluid inclusion, Ar-Ar, and stable isotope studies [texte imprimé] / G. Xue, Auteur ; D. Marshall, Auteur ; S. Zhang, Auteur . - 2011 . - pp. 339-349. Econopmic geology Langues : Anglais (eng) in Economic geology > Vol. 105 N° 2 (Mars/Avril 2010) . - pp. 339-349 Mots-clés : Emerald  formation  Fluid  inclusion  Isotope  China Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : The Dyakou emerald occurrence is located in Malipo County in the province of Yunnan, southern China. The occurrence lies in the northern part of the Laojunshan-Song Chay metamorphic core complex, which is exposed in an area of approximately 2,000 km2 and extends across the border between China and Vietnam. Emerald mineralization is hosted by pegmatite and associated quartz veins that intrude deformed Proterozoic biotite-muscovite granofels and schist. Hydrogen and oxygen isotope results from the emerald channel waters and emerald, respectively, are consistent with an igneous fluid source. The δ18O fractionation between emerald and quartz yields vein temperatures of 365° to 420°C. Fluid inclusions indicate that the emerald precipitated from saline brines ranging from almost pure water to 10.5 mass percent NaCl equiv. Fluid inclusion isochores intersected with δ18O data yield pressures changing along the geothermal gradient from 1,500 to 3,300 bars. Ar-Ar geochronology of biotite and muscovite from the emerald veins yields consistent ages of 124 ± 1 Ma. These constraints combined with field observations indicate that the Dyakou emerald deposit is consistent with the igneous-related model for emerald formation. DEWEY : 553 ISSN : 0361-0128 En ligne : http://econgeol.geoscienceworld.org/content/105/2/339.abstract

Corrosion behavior of 3C magnesium alloys in simulated sweat solution / F. Wu in Materials and corrosion, Vol. 62 N° 3 (Mars 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 3 (Mars 2011) . - pp. 234–239 Titre : Corrosion behavior of 3C magnesium alloys in simulated sweat solution Type de document : texte imprimé Auteurs : F. Wu, Auteur ; S. Zhang, Auteur ; Z. Tao, Auteur Année de publication : 2011 Article en page(s) : pp. 234–239 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Corrosion  behavior  Magnesium  alloys  Simulated  sweat  solution Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : AZ series Mg alloys AZ31, AZ61, and AZ80 are widely applied in 3C (computer, communication, and consumer electronic) industry. Their corrosion characters in simulated sweat solution have been investigated by electrochemical technology, surface analysis, and pH measurements. Electrochemical test results showed that the three magnesium alloys revealed different corrosion resistance (Rt) in simulated sweat solution, Rt(AZ31) < Rt(AZ61) < Rt(AZ80). Three major components of simulated sweat solution played different roles during corrosion processes. Lactic acid was a kind of strong erosive medium for the magnesium alloys, and NaCl can induce pitting corrosion on alloys surface, while urea acted as a corrosion inhibitor. The corroded surface morphology of the three magnesium alloys was observed using scanning electron microscopy (SEM) and corrosion products were analyzed by X-ray diffraction (XRD). Result of pH measurement tests showed that there were differences in climbing speed and final values of pH for the three magnesium alloys in simulated sweat solution. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905510/abstract [article] Corrosion behavior of 3C magnesium alloys in simulated sweat solution [texte imprimé] / F. Wu, Auteur ; S. Zhang, Auteur ; Z. Tao, Auteur . - 2011 . - pp. 234–239. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 3 (Mars 2011) . - pp. 234–239 Mots-clés : Corrosion  behavior  Magnesium  alloys  Simulated  sweat  solution Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : AZ series Mg alloys AZ31, AZ61, and AZ80 are widely applied in 3C (computer, communication, and consumer electronic) industry. Their corrosion characters in simulated sweat solution have been investigated by electrochemical technology, surface analysis, and pH measurements. Electrochemical test results showed that the three magnesium alloys revealed different corrosion resistance (Rt) in simulated sweat solution, Rt(AZ31) < Rt(AZ61) < Rt(AZ80). Three major components of simulated sweat solution played different roles during corrosion processes. Lactic acid was a kind of strong erosive medium for the magnesium alloys, and NaCl can induce pitting corrosion on alloys surface, while urea acted as a corrosion inhibitor. The corroded surface morphology of the three magnesium alloys was observed using scanning electron microscopy (SEM) and corrosion products were analyzed by X-ray diffraction (XRD). Result of pH measurement tests showed that there were differences in climbing speed and final values of pH for the three magnesium alloys in simulated sweat solution. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905510/abstract

Effect of sulphate reducing bacteria on corrosion of Al_Zn_In_Sn sacrificial anodes in marine sediment / F. Liu in Materials and corrosion, Vol. 63 N° 5 (Mai 2012) 

Public ISBD [article]  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