Documents disponibles écrits par cet auteur

Bridging gravimetric and electrochemical approaches to determine the corrosion rate of metals and metal alloys in cooling systems / Ming-Kai Hsieh in Industrial & engineering chemistry research, Vol. 49 N° 19 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9117–9123 Titre : Bridging gravimetric and electrochemical approaches to determine the corrosion rate of metals and metal alloys in cooling systems : Bench scale evaluation method Type de document : texte imprimé Auteurs : Ming-Kai Hsieh, Auteur ; David A. Dzombak, Auteur ; Radisav D. Vidic, Auteur Année de publication : 2010 Article en page(s) : pp. 9117–9123 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Gravimetric  Electrochemical  Metal  alloys  Evaluation  method Résumé : The gravimetric weight loss method and the electrochemical polarization resistance methods were combined to evaluate instantaneous corrosion rates for metals and metal alloys in industrial cooling-water systems. Metal and metal−alloy samples were exposed to synthetic cooling water in a bench-scale recirculating system constructed to study corrosion under flow conditions similar to those of a cooling-water system. The measurements yielded by both methods were related through a coefficient, B′, to convert polarization resistance measurements to instantaneous corrosion rates. The metals and metal alloys tested in this study included mild steel, aluminum, copper, and cupronickel. B′ was observed to change with time initially but approach a constant value for long-term exposure (>3 days) for most metal materials. B′ values varied with metal or metal alloy studied. It was concluded that combining both methods to determine the B′ value for a metal or a metal alloy under particular exposure conditions provides a means of obtaining an accurate instantaneous corrosion rate. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100217k [article] Bridging gravimetric and electrochemical approaches to determine the corrosion rate of metals and metal alloys in cooling systems : Bench scale evaluation method [texte imprimé] / Ming-Kai Hsieh, Auteur ; David A. Dzombak, Auteur ; Radisav D. Vidic, Auteur . - 2010 . - pp. 9117–9123. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9117–9123 Mots-clés : Gravimetric  Electrochemical  Metal  alloys  Evaluation  method Résumé : The gravimetric weight loss method and the electrochemical polarization resistance methods were combined to evaluate instantaneous corrosion rates for metals and metal alloys in industrial cooling-water systems. Metal and metal−alloy samples were exposed to synthetic cooling water in a bench-scale recirculating system constructed to study corrosion under flow conditions similar to those of a cooling-water system. The measurements yielded by both methods were related through a coefficient, B′, to convert polarization resistance measurements to instantaneous corrosion rates. The metals and metal alloys tested in this study included mild steel, aluminum, copper, and cupronickel. B′ was observed to change with time initially but approach a constant value for long-term exposure (>3 days) for most metal materials. B′ values varied with metal or metal alloy studied. It was concluded that combining both methods to determine the B′ value for a metal or a metal alloy under particular exposure conditions provides a means of obtaining an accurate instantaneous corrosion rate. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100217k

Development of an instantaneous corrosion rate monitoring system for metal and metal alloys in recirculating cooling systems / Mahbuboor R. Choudhury in Industrial & engineering chemistry research, Vol. 51 N° 11 (Mars 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 11 (Mars 2012) . - pp. 4230–4239 Titre : Development of an instantaneous corrosion rate monitoring system for metal and metal alloys in recirculating cooling systems Type de document : texte imprimé Auteurs : Mahbuboor R. Choudhury, Auteur ; Ming-Kai Hsieh, Auteur ; Radisav D. Vidic, Auteur Année de publication : 2012 Article en page(s) : pp. 4230–4239 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Corrosion  Metal  alloys  Aqueous  system Résumé : An instantaneous corrosion rate (ICR) monitoring technique, suitable for application in recirculating cooling water systems, is useful for rapid appraisal of corrosiveness of the aqueous system with respect to metal and metal alloys of interest. In this study the instantaneous corrosion rates of mild steel, copper, and cupronickel alloys were measured at various times during an exposure period by electrochemical polarization resistance measurements using a three-electrode system. The average corrosion rates (ACR) were also determined by the gravimetric weight loss method to correlate with the ICR data. Stainless steel was used as the reference electrode to replace the standard saturated calomel electrode for increased robustness of the system in pilot-scale cooling systems. A side-streamflow channel unit was designed to hold the three electrodes in flowing cooling water. Use of stainless steel as a reference electrode was reliable and ICR was monitored intermittently for 28 days. Integration of the ICR data from the pilot-scale cooling towers correlated well with the ACR results, with similar correlation coefficients obtained from bench-scale experiments. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202845g [article] Development of an instantaneous corrosion rate monitoring system for metal and metal alloys in recirculating cooling systems [texte imprimé] / Mahbuboor R. Choudhury, Auteur ; Ming-Kai Hsieh, Auteur ; Radisav D. Vidic, Auteur . - 2012 . - pp. 4230–4239. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 11 (Mars 2012) . - pp. 4230–4239 Mots-clés : Corrosion  Metal  alloys  Aqueous  system Résumé : An instantaneous corrosion rate (ICR) monitoring technique, suitable for application in recirculating cooling water systems, is useful for rapid appraisal of corrosiveness of the aqueous system with respect to metal and metal alloys of interest. In this study the instantaneous corrosion rates of mild steel, copper, and cupronickel alloys were measured at various times during an exposure period by electrochemical polarization resistance measurements using a three-electrode system. The average corrosion rates (ACR) were also determined by the gravimetric weight loss method to correlate with the ICR data. Stainless steel was used as the reference electrode to replace the standard saturated calomel electrode for increased robustness of the system in pilot-scale cooling systems. A side-streamflow channel unit was designed to hold the three electrodes in flowing cooling water. Use of stainless steel as a reference electrode was reliable and ICR was monitored intermittently for 28 days. Integration of the ICR data from the pilot-scale cooling towers correlated well with the ACR results, with similar correlation coefficients obtained from bench-scale experiments. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202845g

Effect of tolyltriazole on the corrosion protection of copper against ammonia and disinfectants in cooling systems / Ming-Kai Hsieh in Industrial & engineering chemistry research, Vol. 49 N° 16 (Août 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 16 (Août 2010) . - pp. 7313–7322 Titre : Effect of tolyltriazole on the corrosion protection of copper against ammonia and disinfectants in cooling systems Type de document : texte imprimé Auteurs : Ming-Kai Hsieh, Auteur ; David A. Dzombak, Auteur ; Radisav D. Vidic, Auteur Année de publication : 2010 Article en page(s) : pp. 7313–7322 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Corrosion  Copper Résumé : Tolyltriazole (TTA) has been widely used as a corrosion inhibitor for copper and copper alloy heat exchanger components in power plant cooling water systems. In this work the effectiveness of TTA protection in the presence of free chlorine, monochloramine, and ammonia was studied, in the context of using secondary treated municipal wastewater as cooling water. Results indicated that the corrosiveness of ammonia becomes negligible in the presence of TTA. Also, monochloramine represents a better disinfection agent in terms of copper corrosion protection by TTA than free chlorine. The packing density, film thickness, and number of layers of TTA adsorbed on the Cu surface were estimated from measurements and compared with estimates from other studies. It was found that copper can work as a catalyst for free chlorine to degrade TTA and that the surface packing density, film thickness, and number of layers increased in the presence of monochloramine. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100384d [article] Effect of tolyltriazole on the corrosion protection of copper against ammonia and disinfectants in cooling systems [texte imprimé] / Ming-Kai Hsieh, Auteur ; David A. Dzombak, Auteur ; Radisav D. Vidic, Auteur . - 2010 . - pp. 7313–7322. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 16 (Août 2010) . - pp. 7313–7322 Mots-clés : Corrosion  Copper Résumé : Tolyltriazole (TTA) has been widely used as a corrosion inhibitor for copper and copper alloy heat exchanger components in power plant cooling water systems. In this work the effectiveness of TTA protection in the presence of free chlorine, monochloramine, and ammonia was studied, in the context of using secondary treated municipal wastewater as cooling water. Results indicated that the corrosiveness of ammonia becomes negligible in the presence of TTA. Also, monochloramine represents a better disinfection agent in terms of copper corrosion protection by TTA than free chlorine. The packing density, film thickness, and number of layers of TTA adsorbed on the Cu surface were estimated from measurements and compared with estimates from other studies. It was found that copper can work as a catalyst for free chlorine to degrade TTA and that the surface packing density, film thickness, and number of layers increased in the presence of monochloramine. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100384d