Approach towards lead abatement and lead free paints / Shrikant M. Naik in PAINTINDIA, Vol. LII, N° 11 (11/2002)

[article]  inPAINTINDIA > Vol. LII, N° 11 (11/2002) . - p. 33-44 Titre : Approach towards lead abatement and lead free paints Type de document : texte imprimé Auteurs : Shrikant M. Naik, Auteur Année de publication : 2002 Article en page(s) : p. 33-44 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Peinture  sans  plomb'  'Article  synthèse'  'Elimination  déchet'  'Déchet  solide'  Substitut  Législation  Toxicité  Plomb  Composé  'Pigment  anticorrosion'  minéral'  'Inhibiteur  corrosion'  Adjuvant  Formulation  primaire'  Matériau  revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : Lead poisoning has been one of the most important occupational diseases, and it remains a preoccupation even today. Exposure to lead is associated with adverse health effect, including permanent damage to the central nervous system. Though a number of lead exposure sources exist, including soil, dust and water, lead from lead-based paints is one of the most significant source of lead exposure. Lead exposure can result from the ingestion of paint chips or dust from deteriorating house paints or from improper paint removal. While lead is no longer used in house paints and the application of lead primers on steel structures is declining throughout the globe, old paints with hazardous levels of lead still remain on many surfaces today. Considerable body of scientific knowledge concerning the toxic effects of lead has been enriched in the past decade by significant new knowledge regarding the most subtle subclinical effects. Similarly in a number of countries it was felt necessary to redraft or modernise protective measures enacted over the last half century to abate the effect of lead poisoning on humans. This article discusses about the effect of lead on humans, legislations on lead, abatement of lead-based paints and technological alternatives for lead free paints. Note de contenu : - Lead used in paints : Anticorrosive primer - Wood primer - Driers in oleoresinous paints - Colouring pigments - Catalyst for alkyd processing - Toxicity of lead : Mechanism of ingestion - Blood lead level - Legislations - Lead free paints : Replacement for lead driers - Replacement for red lead - Replacement for lead chrome - Resistance data - Replacement for lead catalyst - Removal of aged lead paint from structures - Overcoating of aged lead-based paints - Innovations in lead abatement - Containment for lead paint removal - Waste disposal - Occupational health issues Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12423 [article]

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Coating and lining for concrete in secondary chemical containment / Shrikant M. Naik in PAINTINDIA, Vol. XLVII, N° 12 (12/1997)

[article]  inPAINTINDIA > Vol. XLVII, N° 12 (12/1997) . - p. 33-48 Titre : Coating and lining for concrete in secondary chemical containment Type de document : texte imprimé Auteurs : Shrikant M. Naik, Auteur Année de publication : 1997 Article en page(s) : p. 33-48 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Béton  Revêtement  'Revêtement  intérieur'  'Protection  environnement'  'Produit  chimique'  'Formulation  béton'  'Teneur  eau'  Préparation  'Structure  construction'  'Construction  'Réservoir  stockage'  Thermoplastique  'Chape  plancher'  Elastomère  'Centrale  nucléaire' Index. décimale : 667.9 Revêtements et enduits Résumé : The release of hazardous chemicals into the environment is no longer tolerable. People have now become more conscious ofthe adverse effects of toxic chemicals used in industries. Efforts must be made by the chemical industries not to pollute the environment from the inadvertent release of toxic chemicals into the ecological system. The article discusses the use ofconcrete as a secondary containment. Applicable regulations, concrete design, and surface preparation for lining applications have been reviewed. An attempt has been made to summarize the various lining systems available for protecting concrete in secondary containment. Note de contenu : - Concrete as secondary containment structure - Regulations - Concrete design : Concrete mix – Concrete joint design – Concrete cure - Surface preparation : Moisture content in concrete – Crack treatment - Lining characteristics / formulation - Selecting coating and lining for concrete in secondary containment : Chemical resistant masonry – Thermoplastic sheets - Monolithic linings : Liquid applied coatings and linings – Elastomeric systems - Coating for nuclear power plant - Inspection Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13359 [article]

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Service life prediction of organic coatings: electrochemical impedance spectroscopy vs actual service life / Subrahmanya Shreepathi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 2 (03/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 2 (03/2011) . - p. 191-200 Titre : Service life prediction of organic coatings: electrochemical impedance spectroscopy vs actual service life Type de document : texte imprimé Auteurs : Subrahmanya Shreepathi, Auteur ; Akshay Kumar Guin, Auteur ; Shrikant M. Naik, Auteur ; Mohan Rao Vattipalli, Auteur Année de publication : 2011 Article en page(s) : p. 191-200 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Durée de vie (Ingénierie) Electrochimie Essais accélérés (technologie) Essais de brouillard salin Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : Electrochemical impedance spectroscopy (EIS) is used to derive an expression for predicting the service life of organic coating in a C4-type environment (industrial and costal areas with moderate salinity) as defined in ISO 12944 standard for paints and varnishes—corrosion protection of steel structures by protective paint systems. Three coating systems with a record of 2, 5, and 10 years of durability were selected for the study. The selection was also based on proven composition and dry film thickness (DFT) of the coatings as per ISO 12944. Electrochemical impedance measurements of the paint-coated panels were carried out by exposing the coated mild steel panels without scribe in different corrosive environments such as immersion in NaCl solution, neutral salt spray, etc. Neutral salt spray exposure was found to be the most severe corrosive environment among all the three coating systems. In most of the cases, EIS gave early indication of coating failure when compared to visual defects such as blistering and over-film corrosion. Note de contenu : - EXPERIMENTAL : System 1 : Low durable system for normal inland System 2 : Mdium durable system for coastal environment - RESULTS AND DISCUSSION : Exposure to immersion in 3.5 % NaCl Exposure to ASTM B117 (neutral salt spray) ASTM G85 (Prohesion cabinet test) ASTM D5894 (cyclic corrosion test) Immersionin 10 % HS2O4 and NaOH Service life prediction DOI : 10.1007/s11998-010-9299-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-010-9299-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11361 [article]

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Water transportation through organic coatings : correlation between electrochemical impedance measurements, gravimetry, and water vapor permeability / Subrahmanya Shreepathi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 4 (07/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 4 (07/2012) . - p. 411-422 Titre : Water transportation through organic coatings : correlation between electrochemical impedance measurements, gravimetry, and water vapor permeability Type de document : texte imprimé Auteurs : Subrahmanya Shreepathi, Auteur ; Shrikant M. Naik, Auteur ; Mohan Rao Vattipalli, Auteur Année de publication : 2012 Article en page(s) : p. 411-422 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Humidité -- Absorption Infiltration Perméabilité Revêtements -- Effets de l'humidité Revêtements organiques Spectroscopie d'impédance électrochimique Vapeur d'eau Index. décimale : 667.9 Revêtements et enduits Résumé : A primary cause of coating failure is diffusion of water through organic coatings during which many corrosive species are transported to the metal-coating interface. However, water vapor permeability through the coating improves blister resistance to a certain extent. The present work describes the influence of chemical nature of the polymer on the above two properties. Attempts were also made to establish a correlation between these two properties for pigmented organic coating. Six paints were formulated and processed using six different types of binders at a constant pigment volume concentration (PVC) and specific gravity. Water ingress, water vapor permeability, and water absorption of these coatings were estimated using electrochemical impedance measurements (EIS), permeability cup method, and gravimetric method, respectively. There exists a good linear correlation between water uptake measured by EIS and water absorption measured by gravimetry. Similarly, a correlation was also noticed between water uptake by EIS and water vapor permeability. However, polyurethane type polymers did not fit into this linear correlation. Furthermore, influence of the resin chemistry on anticorrosive properties of these coatings was also studied using EIS and salt spray exposure test. Among all polymers under investigation, acrylic polyol-based polyurethane has shown the lowest water uptake, higher impedance, better salt spray resistance but higher water vapor transmission rate. Note de contenu : - EXPERIMENTAL : Materials and reagents - Processing of paints - Characterization - RESULTS AND DISCUSSION : Water uptake by EIS - Water vapor permeability - Water absorption measurements - Role of resin on corrosion protection performance - Salt spray exposure studies DOI : 10.1007/s11998-011-9376-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9376-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15992 [article]

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