| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Mills, Douglas J.
University of Northampton
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (15/15 displayed)
- 2017Advances in corrosion protection by organic coatings: what we know and what we would like to knowcitations
- 2016The application of organic coatings in conservation of archaeological objects excavated from the seacitations
- 2016Analysis of electrochemical noise measurement on an organically coated metalcitations
- 2014Steel surface preparation prior to painting and its impact on protective performance of organic coatingcitations
- 2014Effect of hardener variation on protective properties of polyurethane coatingcitations
- 2012Investigation into the effect of nano-silica on the protective properties of polyurethane coatingscitations
- 2011Investigation of morphological and electrical properties of the PMMA coating upon exposure to UV irradiation based on AFM studiescitations
- 2010Effect of different surface preparations prior to painting on the corrosion behaviour and surface activity of mild steel
- 2010The influence of UV light on performance of poly(methyl methacrylate) in regard to dye-sensitised solar cellscitations
- 2010Use of electrochemical methods to examine different surface preparation methods for organic coatings on steelcitations
- 2010Electrochemical characterization of mild steel after different surface preparations
- 2008Using novel electrochemical test methods to aid in the development of low volatile organic compound (VOC) coatings
- 2008Continuing work to enable electrochemical methods to be used to monitor the performance of organic coatings in the fieldcitations
- 2007MPs and lords learn something about corrosion!
- 2001A comparison between conventional macroscopic and microscopic scanning electrochemical methods to evaluate galvanic corrosioncitations
Places of action
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article
Effect of hardener variation on protective properties of polyurethane coating
Abstract
Polyurethane is a two component coating commonly used in high performance anti-corrosion protectivesystems. The two components are normally a polyacrylic resin and a polyisocyanate hardener. The mainpurpose of this study was to investigate the effect of hardener variation on the protective properties ofpolyurethane coating. Apart from theoretical interest, there is a practical interest to this work because, forvarious reasons, in the field the correct ratio of base to hardener is not always followed. Another aim was todiscover changes in mechanical properties such as abrasion and adhesion, and also find out differences inthe chemical structure and crosslink density. Hence unpigmented polyurethane resin with hardener:baseratios of 0.75:1, 1:1 and 1.5:1 were applied on mild steel panels. Detached coatings were obtained fromcasting on polypropylene sheets. To evaluate anticorrosive properties attached coatings were immersedin 3% sodium chloride for 1008 h and monitored using EIS and DC resistance tests. Abrasion resistance wasmeasured by the Taber test. Wet adhesion was studied by immersing in 3% NaCl for 5 and 7 days, and thenusing the pull-off method. The detached coatings were used to evaluate chemical structure using FTIRspectroscopy, and to look at the physico-mechanical properties using a DMTA test. Electrochemical resultsshowed that polyurethane coatings with a higher hardener ratio have a higher electrical (ionic) resistance.This was attributed to a more tightly cross-linked structure. In addition, polyurethane coatings with ahigher hardener ratio have a better abrasion resistance. The lowest adhesion was given by the coating withthe stoichiometric hardener ratio. The work raised some interesting questions on the relation betweenadhesion and corrosion resistance. The FTIR results indicated that polyurethane coatings with the lowerhardener ratio have fewer urethane groups than coatings with the higher hardener ratio. Furthermoreresults confirmed that the Electrochemical Impedance Spectroscopy and DC resistance are good methodsto investigate how the protection ability of the coatings depends on both the nature of the coating andon time.