Title
Natural versus accelerated weathering: Understanding water kinetics in bilayer coatings
Author
Baukh, V.
Huinink, H.P.
Adan, O.C.G.
van der Ven, L.G.J.
Publication year
2013
Abstract
Exposure to water is a key issue in the performance of multilayer coatings. It may take place in different forms, i.e. as rainfall, dew and humidity variation. Consequently, coatings will experience time-dependent water activity fluctuations. In industrial practice, coatings are subjected to artificial water activity fluctuations in weathering tests. Little is known about the connection between these tests and the reality experience by a coating. This article presents a theoretical investigation of the response of multilayer coatings to water activity fluctuations. This investigation is performed on the basis of a validated model for water transport in hydrophilic base coat/hydrophobic top coat systems. The study aims to understand how permeability and sorption properties determine the overall coating response to fluctuations. It is concluded that present accelerated weathering tests do not mimic natural weathering due to the response time of the considered systems, which are insensitive to rapid fluctuations. © 2013 Elsevier B.V. © 2013 Elsevier B.V. All rights reserved.
Subject
Fluid Mechanics Chemistry & Energetics
RMC - Responsive Materials & Coating
TS - Technical Sciences
High Tech Systems & Materials
Physics
Industrial Innovation
Accelerated weathering
Multilayer coatings
Water kinetics
To reference this document use:
http://resolver.tudelft.nl/uuid:32153664-7da8-4b04-b3b9-397153b669fd
TNO identifier
473604
Publisher
Elsevier
ISSN
0300-9440
Source
Progress in Organic Coatings, 76 (9), 1197-1202
Document type
article