Author:
Kotnarowska Danuta,Żabińska Aleksandra
Abstract
The main goal of the research presented in the article is to assess the impact of the destruction (degradation) of epoxy coatings, caused by the influence of a 25% aqueous solution of
sodium chloride (brine), on the operational properties that determine the coatings reliability
(durability). Samples of two-layer epoxy coatings (obtained from powder paints) were aged
by immersing them in brine for a maximum period of 1680 h. The following criteria were
used to assess the operational properties of the coatings: thickness, roughness and surface
morphology, hardness, water absorption (mass increase), surface free energy. The FTIR and
DSC tests performed showed a progressive development of the oxidation processes of the
epoxy with the ageing period. The long-term impact of the brine resulted in the destruction
of the coatings in the form of: craters, grooves, microcracks, including silver cracks. The
contact of the coatings with brine also increased their: surface roughness (Ra, Rz, Rmax),
thickness, mass, surface free energy, and decreased hardness and heat resistance.
Publisher
Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne
Subject
Industrial and Manufacturing Engineering,Safety, Risk, Reliability and Quality
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