Resistance of paint coatings to multiple solid particle impact: effect of coating thickness and substrate material |
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| Affiliation: | 1. Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, 43 Keelung Road, Section 4, Taipei 10607, Taiwan, ROC;2. Department of Chemical Engineering, National Taiwan University of Science and Technology, 43 Keelung Road, Section 4, Taipei 10607, Taiwan, ROC;1. Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907-2057, USA;2. School of Materials Engineering, Purdue University, West Lafayette, IN 47907-2045, USA;3. School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907-2088, USA;1. Institut de Recherche en Génie Civil et Mécanique (GeM), UMR CNRS 6183, École Centrale de Nantes, France;2. Michelin, Centre Technique de Ladoux, Clermont-Ferrand, France;1. The University of Tokyo, Japan;2. Osaka University, Japan;1. Department of Mechanical Engineering, Faculty of Engineering, Mappin St, Sheffield, United Kingdom;2. Warwick Manufacturing Group, University of Warwick, Coventry, United Kingdom |
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| Abstract: | A novel technique has been developed to determine the resistance of paint coatings to multiple solid particle impact (i.e. solid particle erosion). The effect of paint layer thickness on erosion resistance was evaluated for two acrylic automotive topcoats. These coatings displayed a two-stage response to erosion. Initially, their thickness was reduced progressively, but once a critical thickness was reached the remaining coating was removed by individual impacts. A simple model is proposed to describe this behaviour. A new measure, specific erosion resistance, which takes account of the coating thickness, is defined to allow coatings with different thicknesses to be compared and has been applied to several industrially sprayed automotive clearcoats on both steel and polymer (TPO) substrates. The clearcoats exhibited significantly higher specific erosion resistance when applied to polymer substrates. |
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