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Analysis of polyurethane top-coat destruction influence on erosion kinetics of polyurethane-epoxy coating system
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Kazimierz Pulaski University of Technology and Humanities in RadomFaculty of Mechanical Engineering ul. Malczewskiego 29, 26-600 Radom, Poland
Publication date: 2019-03-31
Eksploatacja i Niezawodność – Maintenance and Reliability 2019;21(1):103–114
The paper presents results of investigations concerning influence of climatic factors and environmental pollution on chemical and physical destruction of polyurethane top coat. In order to increase the operational life of polyurethane coating, its composition was modified by nanoparticles addition of aluminium dioxide (of grain size d=20 nm) or silica (of grain size d=16 nm), which mass share was 3%. Three-year ageing on climatic station of coating systems samples with such modified top coat as well as with unmodified top coat caused its chemical destruction as FTIR (Fourier-transform infrared spectroscopy) examinations documented relevant increase of carbonyl groups (C=0) content. This fact testified oxidation degree rise of superficial layers which indicated their oxidation resistance decrease. Also oxidation initial temperature decrease of polyurethane coating was revealed using DSC (Differential Scanning Calorymetry). Influence of climatic factors and environmental pollution contributed also to the physical destruction of the coating which caused an increase of its surface roughness and generated craters, etchings and cracks (including the silver cracks). Destruction degree of climatically aged polyurethane coating influenced erosive wear intensity of three-layer polyurethane-epoxy coating system. The lowest chemical and physical destruction under the influence of operational factors as well as the highest hardness revealed the coating systems with polyurethane top coat modified with aluminium dioxide what was the reason that they showed also the lowest erosive wear intensity. On the other hand, aged analogously coating systems with polyurethane top coat modified with silica were marked by comparably bigger destruction than the coating systems modified with aluminium dioxide which was the reason of their erosive wear intensity increase.
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