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Evaluation of cut-edge corrosion in environmentally friendly waterborne coil-coatings using the Scanning Vibrating Electrode Technique (SVET) / S. Sheikholeslami in SURFACE COATINGS INTERNATIONAL, Vol. 103.5 (09-10/2020)  

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 103.5 (09-10/2020) . - p. 258-261 Titre : Evaluation of cut-edge corrosion in environmentally friendly waterborne coil-coatings using the Scanning Vibrating Electrode Technique (SVET) Type de document : texte imprimé Auteurs : S. Sheikholeslami, Auteur ; L. Gommans, Auteur ; S. Morrison, Auteur ; G. Williams, Auteur ; H. N. McMurray, Auteur ; P. Morgan, Auteur ; C. Lowe, Auteur ; D. Williams, Auteur ; W. Gao, Auteur Année de publication : 2020 Article en page(s) : p. 258-261 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique. L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1. C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple. Anticorrosifs Anticorrosion Coil coatings Métaux -- Revêtements protecteurs Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : There is an increasing demand for painted galvanised steels for building applications worldwide, and great efforts are being made to improve the corrosion behaviour of coil coatings in order to reduce relevants costs. Evaluating corrosion resistance in painted coils was mainly done via the natural exposure test, following a standardised process at exposure sites, until accelerated corrosion tests such as salt spray and cyclic corrosion test were finally introduced. Theses tests reinforce the need for a laboratory method of predicting long term performance of corrosion-protective coatings in an accelerated timescale. Cut edge in painted coils is one of the main sites where coating failure initiates. Since the steel substrate in coil coating is fully exposed at the cut-edge, the galvanic coupling causes noticeable corrosion and paint delamination (a phenomenon reffered to as "undercutting") over time. Therefore, several studies in this area were performed to understand and, more importantly, tried to correlate lab results to long term weathering exposure performance. In this study, we have utilised an electrochemical scanning technique to analyse corrosion at the cut-edge of fully commercialised environmental-friendly coating systems and benchmarked these results natural exposure assessments for the first time. Note de contenu : - Introduction to Scanning Vibrating Electrode Technique (SVET) - Rapid corrosion assessment by SVET - Fig. 1 : Schematic and in-operation views of the SVET probe for corrosion studies - Fig. 2 : SVET current density maps of A) P1, B) P2 and C) P3 after 12 hours in 5 wt. % NaCl solution - Fig. 3 : SVET current density maps of A) P1, B) P2 and C) P3 after 24 hours in 5 wt. % NaCl solution - Fig. 4 : Total mass loss comparison of P1, P2 and P3 after 24 hours in 5 wt. % NaCl solution using SVET - Fig. 5 : Naturally-exposed panels at Muriwai beach ; A) P1, B) P2 and C) P3 coating systems after ten months of unwashed exposure Table 1 : Edge creep analysis of panels according to the AS/NZS 2728 standard En ligne : https://drive.google.com/file/d/1pTuj5Sq_79AYW55ZUNS7Hv7GzdkGscI7/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34727 [article]

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Designing self-stratify coatings based on epoxy-PU systems containing three pigments / Shahdad Zahedi in SURFACE COATINGS INTERNATIONAL, Vol. 103.5 (09-10/2020)  

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 103.5 (09-10/2020) . - p. 268-273 Titre : Designing self-stratify coatings based on epoxy-PU systems containing three pigments Type de document : texte imprimé Auteurs : Shahdad Zahedi, Auteur ; Seyed Reza Ghaffarian, Auteur Année de publication : 2020 Article en page(s) : p. 268-273 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosifs Anticorrosion Caractérisation Copolymère uréthane époxy Dioxyde de titane Formulation (Génie chimique) Oxyde de fer micacé Pigments Revêtement en phase solvant Revêtements autostratifiants Verre -- Revêtements Zinc Index. décimale : 667.9 Revêtements et enduits Résumé : A self-stratifying coating contains at least two resins of different natures, which spontaneously stratify after application on a substrate. Various self-stratifying systems have been reported in the literature, but self-stratifying coatings containing three pigments have rarely been discussed. In this paper, a series of self-stratifying coatings based on an epoxy-PU system and containing three pigments, i.e. zinc dust, micaceous iron oxide (MIO) and titanium dioxide (TiO2) were prepared and applied on glass plates. Stratification was studied and evaluated by Fourier Transform Infrared Spectroscopy using Attenuated Total Reflectance (FTIR-ATR) on both sides of the films. Scanning Electron Microscopy with Energy Dispersive X-ray Spectroscopy (SEM-EDX) analyses and mappings with line scans from cross-sections of the films were carried out to characterise the degree of stratification and the location of the pigments. The aim of this research is to study the factors that affect stratification and the location of the pigments in self-stratifying coatings containing three pigments, and leading to the design of a three-layered self-stratifying epoxy-PU anti-corrosive coating system. It was found that a higher solid percent of epoxy resin has a positive effect on stratification and pigment location. It was also found that better stratification was obtained by replacing some of the xylene in a formulation with a solvent with a higher evaporation rate (butyl acetate). Note de contenu : - EXPERIMENTAL : Materials - Coatings formulation - RESULTS AND DISCUSSION : FTIR-ATR results - SEM/mapping results - Fig. 2 : SEM/mapping images, F5-F7 formulas - Fig. 3 : Line scans for films of 5, F6 and F7 formulations - Fig. 4 : Liquid formulations F3, F4 and F7 in clear bottles after 72 hours storage - Table 1 : Prepared formulations - Table 2 : Weight percentage of elements in the top and bottom areas in the film cross-sections for F5, F6 and F7 formulations by EDX En ligne : https://drive.google.com/file/d/16cUOIqMPjQJs10ysmgZdKtqQZkXPdmnw/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34728 [article]

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1-part and 2-part polyurethane adhesive / Keith Berry in SURFACE COATINGS INTERNATIONAL, Vol. 103.5 (09-10/2020)  

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 103.5 (09-10/2020) . - p. 274-275 Titre : 1-part and 2-part polyurethane adhesive Type de document : texte imprimé Auteurs : Keith Berry, Auteur Année de publication : 2020 Article en page(s) : p. 274-275 Langues : Anglais (eng) Catégories : Colles bi-composante:Adhésifs bi-composant Colles mono-composant:Adhésifs mono-composant Polyuréthanes Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Due to their unique characteristics, polyurethane adhesives are widely used within the industry as they can be formulated to give a wide range of physical properties, such as viscosity and adhesion to many different substrates, and application properties, such as pot life (time to apply after mixing a 2-part adhesive). Polyurethane systems used for adhesives can be separated into two main classifications, 1K (1-part) and 2K (2-part) systems, which share some similarities, but each technology has its distinct advantages and disadvantages. Note de contenu : - Basic chemistry - Advantages and limitations - Troubleshooting - Table 1 : Advantages and limitations of polyurethane-based adhesives - Table 2 : Specific advantages and disadvantages of 1K polyurethane-based adhesives - Table 3 : Specific advantages and disadvantages of 2K polyurethane-based adhesives En ligne : https://drive.google.com/file/d/1jcLLNjCSS0df9hsiy3aYiWsFfiRWb6B-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34729 [article]

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