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The role of stress and topcoat properties in blistering of coil-coated materials
RISE - Research Institutes of Sweden, Materials and Production, KIMAB. (Institut de la Corrosion)
RISE - Research Institutes of Sweden, Materials and Production, KIMAB. (Institut de la Corrosion)
Polytechnique de Mons, Belgium.
Polytechnique de Mons, Belgium.
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2010 (English)In: Progress in organic coatings, ISSN 0300-9440, E-ISSN 1873-331X, Vol. 68, no 4, p. 328-333Article in journal (Refereed) Published
Abstract [en]

The effect of topcoat properties on the tendency of painted materials to blistering was studied. Six topcoats were applied on identical panels of hot-dip galvanized steel painted with a polyester primer. The tendency to blistering was assessed under the conditions of permanent condensation in a Q-panel condensation test at 60 °C. Internal tensile stress and stress development in organic coatings during temperature and relative humidity cycling were investigated by the cantilever curvature method. Although blisters originated from the metal/polymer interface, the extent of blistering was strongly influenced by the topcoat. Available data suggest that it may increase with the coating thickness, glass transition temperature (Tg) and thermal expansion properties. Connection was found between the internal tensile stress formed in topcoats during the paint film preparation and the extent of blistering. A hypothesis that stress-assisted interfacial bond hydrolysis was responsible for blister initiation is proposed. Other experiments suggested that local paint buckling over non-adherent sites can be caused by plastic deformation of the paint due to relief of compressive stress generated at elevated temperature or by ingress of water.

Place, publisher, year, edition, pages
2010. Vol. 68, no 4, p. 328-333
Keywords [en]
Accelerated testing, Blistering, Mechanism, Organic coatings, Stress, Coating thickness, Curvature method, Elevated temperature, Glass transition temperature, Hot-dip galvanized steel, Interfacial bonds, Paint films, Stress development, Temperature and relative humidity, Thermal expansion properties, Atmospheric humidity, Condensation, Film preparation, Galvanized metal, Galvanizing, Glass transition, Paint, Photoresists, Stress relief, Tensile stress, Thermal expansion, Thickness measurement
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:ri:diva-40422DOI: 10.1016/j.porgcoat.2010.03.003Scopus ID: 2-s2.0-77953143254OAI: oai:DiVA.org:ri-40422DiVA, id: diva2:1361412
Available from: 2019-10-16 Created: 2019-10-16 Last updated: 2019-10-16Bibliographically approved

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