Corrosion protection by organic coatings containing polyaniline salts prepared by oxidative polymerization / M. Kohl in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 6 (11/2017) . - p. 1397-1410 Titre : Corrosion protection by organic coatings containing polyaniline salts prepared by oxidative polymerization Type de document : texte imprimé Auteurs : M. Kohl, Auteur ; A. Kalendova, Auteur ; E. ÄŒernoÅ¡ková, Auteur ; M. Bláha, Auteur ; J. Stejskal, Auteur ; M. Erben, Auteur Année de publication : 2017 Article en page(s) : p. 1397-1410 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Corrosion Electrochimie Essais accélérés (technologie) Liants Polyalkydes Polyaniline Polymérisation par oxydation Revêtements -- Analyse:Peinture -- Analyse Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Revêtements organiques Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : The aim of this work was to describe polyaniline salts synthesized and to assess the mechanical and anticorrosion properties of alkyd resin-based coating materials pigmented with them, in dependence on the pigment volume concentration and type. Polyaniline salts were prepared by oxidative polymerization in the solutions of inorganic (hydrochloric, phosphoric, and sulfuric) and organic (p-toluenesulfonic and 5-sulfosalicylic) acids. Polyaniline salts were characterized by thermal analysis and spectroscopic methods. Electrical conductivity was also measured by the van der Pauw method, and the molecular weight of the polyaniline was determined by gel permeation chromatography. Furthermore, the particle size of the solid salts was measured, and the morphology was studied by scanning electron microscopy. Subsequently, the parameters required to formulate pigmented organic coatings, i.e., density and critical pigment volume concentration were determined. A soybean oil-based fast drying alkyd resin of medium oil length was used as the binder for the organic coating material. Organic coatings containing the polyaniline salts at pigment volume concentrations 0%, 1%, 5%, 10%, and 15% were formulated and subjected to a standard accelerated cyclic corrosion tests. The organic coatings (paint films) were also subjected to mechanical tests and to the electrochemical test by potentiodynamic polarization studies. Note de contenu : - EXPERIMENTAL METHODS : Synthesis - Characterization - Formulation and preparation of the organic coatings - Mechanical properties of the paints - Corrosion studies - RESULTS AND DISCUSSION : Thermogravimetric analysis - Differential scanning calorimetry (DSC) - X-ray diffraction analysis - Infrared spectroscopy - Molecular weight - Conductivity - Particle size - Particle morphology - pH and electrical conductivity of aqueous extracts of the polyaniline salts and paint films - Density, oil absorption, and critical pigment volume concentration (CPVC) - Mechanical properties of the coating systems - Accelerated cyclic corrosion tests - Mechanism of corrosion protection by polyaniline coatings DOI : 10.1007/s11998-017-9942-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9942-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29643 [article]

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Effects of conductive polymers (type and concentration) in coatings with zinc particles of different shapes / M. Kohl in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 4 (07/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 4 (07/2019) . - p. 949-962 Titre : Effects of conductive polymers (type and concentration) in coatings with zinc particles of different shapes Type de document : texte imprimé Auteurs : M. Kohl, Auteur ; A. Kalendova, Auteur ; Pravin P. Deshpande, Auteur ; E. Schmidova, Auteur Année de publication : 2019 Article en page(s) : p. 949-962 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Anticorrosifs Anticorrosion Benzoates Un benzoate est un sel de l'acide benzoïque (C6H5COOH ou C7H6O2) qui est un acide carboxylique aromatique dérivé du benzène. Les benzoates sont notamment utilisés dans l'industrie alimentaire comme additifs : - Le benzoate de sodium (Na+ + C6H5COO-), référencé en Europe sous le code « E211 » - Le benzoate de potassium (K+ + C6H5COO-), référencé en Europe sous le code « E212 » - Le benzoate de calcium (Ca2+ + (C6H5COO-)2), référencé en Europe sous le code « E213 » Composés lamellaires Conducteurs organiques Essais accélérés (technologie) Formulation (Génie chimique) Particules (matières) Polyaniline Poudres métalliques Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Revêtements organiques Zinc Index. décimale : 667.9 Revêtements et enduits Résumé : The objective of this work was to compare the anticorrosion effects of organic coatings containing zinc metal consisting of either lamellar particles or isometric particles and to reduce the zinc metal content of the coatings while preserving their high anticorrosion efficiency. The optimization and Zn metal content reduction can be achieved using zinc with a lamellar particle shape and application of conductive polymers. Conductive polymers are expected to enhance the electrochemical effect of zinc metal in paints. Organic coatings with lamellar zinc particles also exhibit better mechanical properties. Optimization of the amount of zinc lamellar particles could promote a wider use of this material in anticorrosion paints. The conductive polymers used in this work included polyaniline phosphate, polyaniline benzoate, and carbonized polyaniline. A solvent-based epoxy–ester resin served as the binder. Model paints consisting of this resin and containing different concentrations of polyaniline phosphate, polyaniline benzoate, and carbonized polyaniline were prepared. The paints were tested at the critical pigment volume concentration (CPVC) of Zn dust and at lower Zn dust concentrations, specifically 2% below the CPVC. The paints containing combinations of zinc and a conductive polymer contained the sum of the pigments just below the CPVC of the zinc dust species used. This implies a level of 39% of (PVCZn-lam) for the systems with lamellar zinc and a level of 61% of (PVCZn–sf) for the systems with spherical zinc. The pigment volume concentration (PVC) of the conductive polymers in the zinc-containing paints was (based on results obtained previously) 1%, 5%, and 10% in the systems with lamellar zinc and 1%, 5%, 10%, and 15% in the systems with spherical zinc. The organic coatings were subjected to accelerated cyclic corrosion tests and electrochemical measurements. The sample containing polyaniline carbonate (PVC = 1%) and spherical zinc exhibited a significantly lower corrosion rate as compared to that of uncoated steel. Note de contenu : - EXPERIMENTAL PART : Synthesis of conductive polymers - Pigment parameter determination - Specification of the binder for coatings - Formulation and preparation of the organic coatings - Mechanical properties of the paints - Corrosion test procedures - Potentiodynamic polarization studies - RESULTS AND DISCUSSION : Pigment specification - Evaluation of accelerated corrosion tests - Potentiodynamic polarization studies - Results of adhesion properties of the protective organic coatings - Characterizing the organic coating composition - Summary of the results of the adhesion properties and accelerated corrosion tests DOI : 10.1007/s11998-018-00169-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-00169-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32852 [article]

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