Acid-resistant organic coatings for the chemical industry : a review / Victor Buhl Møller in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 2 (03/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 2 (03/2017) . - p. 279-306 Titre : Acid-resistant organic coatings for the chemical industry : a review Type de document : texte imprimé Auteurs : Victor Buhl Møller, Auteur ; Kim Dam-Johansen, Auteur ; Sarah Maria Frankaer, Auteur ; Søren Kiil, Auteur Année de publication : 2017 Article en page(s) : p. 279-306 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Industries chimiques Résistance chimique Revêtements -- Analyse:Peinture -- Analyse Revêtements -- Détérioration:Peinture -- Détérioration Revêtements organiques Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : Industries that work with acidic chemicals in their processes need to make choices on how to properly contain the substances and avoid rapid corrosion of equipment. Certain organic coatings and linings can be used in such environments, either to protect vulnerable construction materials, or, in combination with fiber reinforcement, to replace them. However, degradation mechanisms of organic coatings in acid service are not thoroughly understood and relevant quantitative investigations are scarce. This review describes the uses and limitations of acid-resistant coatings in the chemical industry, with a comparison to alternative resistant materials based on metals or ceramics. In addition, coating degradation phenomena, caused by acid exposure, are mapped to the extent possible, and analysis methods for detecting coating degradation type and severity are listed and discussed. It is concluded that more knowledge on chemical and physical degradation mechanisms is required, and that improvements in resistance to elevated temperatures and abrasion would decrease the risk of use and increase the potential application areas of organic coatings exposed to acidic environments in the chemical industry. Note de contenu : - ORGANIC COATINGS IN ACIDIC ENVIRONMENTS : History - Process limitations of acid-resistant coatings - ACID-RESISTANT MATERIALS : Inorganic materials - Organic coatings - COATINGS DEGRADATION IN ACID SERVICE : Physical degradation through diffusion - Chemical degradation - Acid degradation of commercial thermosets - EXPERIMENTAL TESTING AND ANALYSIS : Diffusion analysis - Analysis of chemical change - Visual alterations DOI : 10.1007/s11998-016-9905-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9905-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28143 [article]

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Diffusion cell investigations into the acidic degradation of organic coatings / Victor Buhl Møller in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - 1201-1215 Titre : Diffusion cell investigations into the acidic degradation of organic coatings Type de document : texte imprimé Auteurs : Victor Buhl Møller, Auteur ; Ting Wang, Auteur ; Kim Dam-Johansen, Auteur ; Sarah Maria Frankaer, Auteur ; Søren Kiil, Auteur Année de publication : 2018 Article en page(s) : 1201-1215 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acidité Coefficient de diffusion Un coefficient de diffusion est une grandeur caractéristique du phénomène de diffusion de la matière. Le coefficient de diffusion mesure le rapport entre le flux molaire dû à la diffusion moléculaire, et le gradient de concentration de l'espèce chimique considérée (ou, plus généralement, de la variable d'effort entraînant cette diffusion), comme formulé par la loi de Fick. Copolymère vinyle ester Matériaux -- Propriétés barrières Modèles mathématiques Perméation Polyuréthanes Revêtements organiques Revêtements protecteurs -- Détérioration Index. décimale : 667.9 Revêtements et enduits Résumé : Protective organic coatings work by preventing contact between an aggressive environment and a vulnerable substrate. However, the long required lifetime of a barrier coating provides a challenge when attempting to evaluate coating performance. Diffusion cells can be used as a tool to estimate coating barrier properties and lifetime. In this work, a diffusion cell array was designed, constructed, and compared to previous designs, with simplicity being the most important design parameter. Sulfuric acid diffusion through five different coatings was monitored using a battery of cells, and a mathematical model was developed to simulate the experimental data and to study diffusion mechanisms. The diffusion cells allowed an objective and fast analysis of coating barrier properties. It was found that sulfuric acid deteriorated these properties as it diffused through the films. This was also expressed in the modeling results, where a three-step time dependency of the diffusion coefficient was required to simulate both acid breakthrough time and the subsequent steady-state flux. A vinyl ester-based coating proved to be the most effective barrier to sulfuric acid diffusion, followed by a polyurethane coating. Amine-cured novolac epoxies provided the least effective protection. Note de contenu : - PREVIOUS DIFFUSION CELL DESIGN - NEW DIFFUSION CELL DESIGN - DIFFUSION CELL DETAILS - EXPERIMENTAL CONDITIONS - EXPERIMENTAL PROCEDURE - COATINGS INVESTIGATED - MATHEMATICAL MODELING : Mass balance - Estimation of model parameters - EXPERIMENTAL RESULTS : Preliminary conditions - Harsh conditions - MATHEMATICAL MODELING OF DIFFUSION DATA : Using constant diffusion coefficients - Using concentration and time-dependent diffusion coefficients - DISCUSSION : Coating barrier properties - Coating performance and lifetime estimation - Coating degradation and diffusion mechanisms - Water saturation effects - Combined cell mechanism - VALIDATION OF MODEL ASSUMPTIONS DOI : 10.1007/s11998-018-0094-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0094-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31331 [article]

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Simultaneous acid exposure and erosive particle wear of thermoset coatings / Victor Buhl Møller in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 3 (05/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 3 (05/2018) . - p. 457-469 Titre : Simultaneous acid exposure and erosive particle wear of thermoset coatings Type de document : texte imprimé Auteurs : Victor Buhl Møller, Auteur ; Kim Dam-Johansen, Auteur ; Sarah Maria Frankaer, Auteur ; Søren Kiil, Auteur Année de publication : 2018 Article en page(s) : p. 457-469 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acides Copolymère vinyle ester Epoxydes Essais accélérés (technologie) Lixiviation Matériaux -- Propriétés barrières Polyuréthanes Revêtements -- Analyse Revêtements -- Détérioration Revêtements organiques Thermodurcissables Index. décimale : 667.9 Revêtements et enduits Résumé : Handling acidic chemicals is a challenge in the chemical industry, requiring a careful choice of contact material. Certain thermoset organic coatings are applicable in low pH environments, but when particulate erosion is also present the performance demand is increased. This is the case in, e.g., stirred tanks for agitated leaching of copper ore, where sulfuric acid is mixed with an erosive slurry. A pilot-scale agitated leaching tank was designed and constructed to explore the performance of selected thermoset coatings in such an environment. For reference, simple immersion experiments were conducted. Coating durability was estimated by observing the film thickness change during exposure. It was found to be a function of film swelling and film contraction, due to chemical exposure, as well as the “polishing” caused by erosive wear. Film reduction rates varied with radial position in the tank bottom-placed coating samples. Maximum rates were found about halfway between the reactor center and wall. Polishing rates also varied significantly with acid concentration, most likely due to chemical reactions taking place between the acid and the coatings, damaging surface mechanical properties, similar to the erosion/corrosion-type phenomena found in metals. A vinyl ester-based coating was the most resistant to the simultaneous erosive/acidic exposure, with a maximum polishing rate of 3.24±0.61 μm/week, while novolac epoxy and polyurethane coatings showed high polishing rates of 11.7±1.50 and 13.4±0.57μm/week, respectively. Note de contenu : - INTRODUCTION : Agitated leaching - Degradation mechanisms - REPLICATING LEACHING CONDITIONS : downscaling of an industrial leaching reactor - Erosive and chemical environment - EXPERIMENTAL : : Coatings and curing - Procedure - RESULTS AND DISCUSSION : Mild condition erosion - Harsh condition erosion - Varying polishing rates - Tg and hardness effects - Chemical reaction effects - Polishing and reaction mechanism DOI : 10.1007/s11998-018-0058-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0058-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30742 [article]

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