Electrochemical impedance study for modeling the anticorrosive performance of coatings based on accelerated tests and outdoor exposures / Franky E. Bedoya in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 895-904 Titre : Electrochemical impedance study for modeling the anticorrosive performance of coatings based on accelerated tests and outdoor exposures Type de document : texte imprimé Auteurs : Franky E. Bedoya, Auteur ; Ángela Bermudez, Auteur ; Juan G. Castano, Auteur ; Félix Echeverría, Auteur ; Jorge A. Calderón, Auteur Année de publication : 2016 Article en page(s) : p. 895-904 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Corrosion Essais accélérés (technologie) Prévision, Théorie de la Revêtements organiques Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, the atmospheric corrosive protection characteristics of four organic coatings were modeled based on the evolution of low-frequency impedance (|Z|ω→0) over time when subjected to accelerated tests and outdoor exposures. Environmental characteristics such as the time of wetness, chloride and sulfate depositions, and ultraviolet radiation were defined as explanatory variables. The results obtained helped to establish a relationship between |Z|ω→0, acquired from electrochemical impedance spectra, and the explanatory variables. An adjustment factor was calculated for each coating against the most aggressive natural exposure, resulting in a good prediction of |Z|ω→0 and the performance of the coatings for other outdoor tests. Note de contenu : - MATERIALS AND METHODS : Accelerated tests - Natural outdoor tests - Accelerated outdoor tests - Atmospheric characterization for outdoor tests - Electrochemical cell parameters for EIS measurements - THEORETICAL TREATMENT - RESULTS AND DISCUSSION : Accelerated test predictors - Outdoor test predictors - Estimation of coefficients from the accelerated tests measurements - Prediction of impedance modules for outdoor exposures - Estimation of failure times DOI : 10.1007/s11998-016-9803-7 En ligne : http://link.springer.com/content/pdf/10.1007%2Fs11998-016-9803-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27128 [article]

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Renewable rust inhibitors / A. M. Pereyra in EUROPEAN COATINGS JOURNAL (ECJ), N° 3/2006 (03/2006)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 3/2006 (03/2006) . - p. 24-28 Titre : Renewable rust inhibitors : Natural tannates can be effective anticorrosives for steel Type de document : texte imprimé Auteurs : A. M. Pereyra, Auteur ; Carlos A. Giudice, Auteur ; Juan G. Castano, Auteur ; Félix Echeverría, Auteur ; L. K. Herrera, Auteur Année de publication : 2006 Article en page(s) : p. 24-28 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Corrosion protection - Samples of tannins extracted from the quebracho colorado have been characterised and used both in pretreatment primers and, after conversion to metallic tannates, inn protective coatings. The variables which give best performance have been identified. It is shown that metallic tannates may be able to provide corrosion protection equal to that of toxic chromates. En ligne : https://drive.google.com/file/d/1K8pLSmRzpCiO6i8XnjhyiWEIC-YKt-AM/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8523 [article]

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Tripigmented anticorrosive coatings based on lamellar zinc as inhibitor / A. M. Pereyra in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 89, B3 (09/2006)  

[article]  inSURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 89, B3 (09/2006) . - p. 245-249 Titre : Tripigmented anticorrosive coatings based on lamellar zinc as inhibitor Type de document : texte imprimé Auteurs : A. M. Pereyra, Auteur ; Juan G. Castano, Auteur ; Félix Echeverría, Auteur ; L. K. Herrera, Auteur ; Carlos A. Giudice, Auteur Année de publication : 2006 Article en page(s) : p. 245-249 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosifs Composés lamellaires Concentration pigmentaire volumique Essais de brouillard salin Inhibiteurs (chimie) Pigments Primaire (revêtement) Statistique Zinc Index. décimale : 667.9 Revêtements et enduits Résumé : The objective of this work was to study the behaviour of zinc primers, containing either lamellar zinc alone or lamellar zinc mixed with an extender or with an extender/inhibitor mixture. Several formulations of coatings were designed. Accelerated tests were carried out by means of a salt-spray (fog) chamber and a 100% relative humidity cabinet. A statistical analysis was performed considering simultaneous ways of dry-film blistering resistance and anticorrosive behaviour. Results indicated that it was possible to incorporate an extender of high-oil absorption as a spacer of the lamellar zinc particles and also an inhibitor to improve the performance. Note de contenu : - Formulation and manufacture of primers : Inhibiting pigment and extender - Film-forming material - Pigment composition - Pigment volume concentration - Pigment dispersion - Experimental method - Table 1 : Characteristics of metallic zinc inhibiting pigment and extender - Table 2 : Identification of modified primers - Table 3 : Composition of sealer, percentage in weight - Table 4 : Lamellar zinc-rich coatings. Salt fog chamber (ASTM B 117, 1500 hours). Degree of rusting, ASTM D 1654 - Table 5 : Modified lamellar zinc. Salt fog chamber (ASTM B 117, 1500 hours). Degree of rusting, ASTM D 1654 - Table 6 : Lamellar zinc-rich coatings. 100 % relative humidity chamber (ASTM D 2247, 5OO hours). Degree of blistering, ASTM D 714 - Table 7 : Modified lamellar zinc. 100 % relative humidity chamber (ASTM D 2247, 500 hours). Degree of blistering, ASTM D 714 - Table 8 : Sum values of degree of rusting and degree of blistering for the lamellar zinc primers DOI : 10.1007/BF02699667 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699667.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5284 [article]

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