RESEARCH PAPER
Analysis of polyurethane top-coat destruction influence on erosion kinetics of polyurethane-epoxy coating system
1
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
KEYWORDS
ABSTRACT
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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| eISSN: | 2956-3860 |
| ISSN: | 1507-2711 |
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