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Influence of two specific inhibitors on steel corrosion in a synthetic solution simulating a carbonated concrete with chlorides / C. Monticelli in Materials and corrosion, Vol. 62 N° 2 (Fevrier 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 2 (Fevrier 2011) . - pp. 178–186 Titre : Influence of two specific inhibitors on steel corrosion in a synthetic solution simulating a carbonated concrete with chlorides Type de document : texte imprimé Auteurs : C. Monticelli, Auteur ; A. Frignani, Auteur ; A. Balbo, Auteur Année de publication : 2011 Article en page(s) : pp. 178–186 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Carbonation  Chloride  Corrosion  inhibitor  EIS  analysis  Synthetic  solution Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The present research aims at studying two corrosion inhibitors, that is sodium 2-amino-benzoate (2AMB) and sodium glycero-phosphate (GPH), in a synthetic solution simulating the composition of the pore solution in a carbonated concrete, containing chlorides. Tests have been performed to verify if the simultaneous use of the two substances is compatible and if their addition can efficiently hinder the corrosion attack in the presence of both chlorides and carbonation. The synthetic solution has been prepared by bubbling carbon dioxide through a saturated (and filtered) solution of Ca(OH)2, containing 0.1 M NaCl, in order to reach pH 7. Polarization curve recording and EIS technique have shown that, after an induction period of about 24 h, the highest inhibiting efficiencies are obtained by mixtures of the two additives at the concentration of 0.05 M, which still produce high inhibiting efficiencies (87%) at the end of 120 h immersion. At the end of this exposure period, also more diluted symmetric mixtures (0.025 and 0.01 M) exhibit comparable efficiencies. The analysis of EIS spectra gives interesting information concerning the inhibiting mechanism of the studied mixture. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005764/abstract [article] Influence of two specific inhibitors on steel corrosion in a synthetic solution simulating a carbonated concrete with chlorides [texte imprimé] / C. Monticelli, Auteur ; A. Frignani, Auteur ; A. Balbo, Auteur . - 2011 . - pp. 178–186. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 2 (Fevrier 2011) . - pp. 178–186 Mots-clés : Carbonation  Chloride  Corrosion  inhibitor  EIS  analysis  Synthetic  solution Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : The present research aims at studying two corrosion inhibitors, that is sodium 2-amino-benzoate (2AMB) and sodium glycero-phosphate (GPH), in a synthetic solution simulating the composition of the pore solution in a carbonated concrete, containing chlorides. Tests have been performed to verify if the simultaneous use of the two substances is compatible and if their addition can efficiently hinder the corrosion attack in the presence of both chlorides and carbonation. The synthetic solution has been prepared by bubbling carbon dioxide through a saturated (and filtered) solution of Ca(OH)2, containing 0.1 M NaCl, in order to reach pH 7. Polarization curve recording and EIS technique have shown that, after an induction period of about 24 h, the highest inhibiting efficiencies are obtained by mixtures of the two additives at the concentration of 0.05 M, which still produce high inhibiting efficiencies (87%) at the end of 120 h immersion. At the end of this exposure period, also more diluted symmetric mixtures (0.025 and 0.01 M) exhibit comparable efficiencies. The analysis of EIS spectra gives interesting information concerning the inhibiting mechanism of the studied mixture. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005764/abstract

Mono-carboxylate conversion coatings for AZ31 Mg alloy protection / A. Frignani in Materials and corrosion, Vol. 62 N° 11 (Novembre 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 11 (Novembre 2011) . - pp. 995–1002 Titre : Mono-carboxylate conversion coatings for AZ31 Mg alloy protection Type de document : texte imprimé Auteurs : A. Frignani, Auteur ; V. Grassi, Auteur ; F. Zucchi, Auteur Année de publication : 2012 Article en page(s) : pp. 995–1002 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : AZ31  Conversion  coating  Corrosion  Magnesium  alloy  Mono-carboxylic  acids Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Conversion coatings on a magnesium alloy were obtained by dipping AZ31 specimens in aqueous solutions of sodium salts of mono-carboxylic acids (stearic, palmitic, myristic, lauric, mono-carboxylate ion concentration from 1 to 5 mM, depending on the salt solubility) for 24 and 72 h at room temperature, or 24 h at 50 °C. The influence exerted by the treatment time, bath temperature and alkyl chain length on the efficiency of these coatings was studied. The performances of the coatings were evaluated by potentiodynamic polarization curve recording after 1 h immersion in 0.05 M Na2SO4 solution, while their temporal evolution was monitored by electrochemical impedance spectroscopy (EIS) spectra during 24 h. Further and long lasting tests were carried out also in 0.1 M NaCl solution. The efficiency of the coatings depended on the aliphatic chain length, and increased as the treatment time and the bath temperature were increased. The coating of lower homologue only hindered the cathodic process, while those of the higher homologues markedly inhibited the anodic process too. The best performances were displayed by 24 h-50°C stearic conversion coating, which maintained a very high efficiency for over 800 h immersion in 0.05 M sulphate solution. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905615/abstract [article] Mono-carboxylate conversion coatings for AZ31 Mg alloy protection [texte imprimé] / A. Frignani, Auteur ; V. Grassi, Auteur ; F. Zucchi, Auteur . - 2012 . - pp. 995–1002. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 11 (Novembre 2011) . - pp. 995–1002 Mots-clés : AZ31  Conversion  coating  Corrosion  Magnesium  alloy  Mono-carboxylic  acids Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Conversion coatings on a magnesium alloy were obtained by dipping AZ31 specimens in aqueous solutions of sodium salts of mono-carboxylic acids (stearic, palmitic, myristic, lauric, mono-carboxylate ion concentration from 1 to 5 mM, depending on the salt solubility) for 24 and 72 h at room temperature, or 24 h at 50 °C. The influence exerted by the treatment time, bath temperature and alkyl chain length on the efficiency of these coatings was studied. The performances of the coatings were evaluated by potentiodynamic polarization curve recording after 1 h immersion in 0.05 M Na2SO4 solution, while their temporal evolution was monitored by electrochemical impedance spectroscopy (EIS) spectra during 24 h. Further and long lasting tests were carried out also in 0.1 M NaCl solution. The efficiency of the coatings depended on the aliphatic chain length, and increased as the treatment time and the bath temperature were increased. The coating of lower homologue only hindered the cathodic process, while those of the higher homologues markedly inhibited the anodic process too. The best performances were displayed by 24 h-50°C stearic conversion coating, which maintained a very high efficiency for over 800 h immersion in 0.05 M sulphate solution. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905615/abstract