The composition of the coating layers was studied by energy dispersive spectroscopy (EDS) model INCA and X-ray photo electron spectroscopy (XPS) model
8025-BesTec. The radiation source in the XPS analysis (at pressure
of 10–9 mbar) was Al K and the shift of binding energies (BE) was
calibrated with respect to the reference peak of C.
The contact angle measurements were performed by an OCA
15 plus type contact angle measuring system. Distilled water was
used as probe liquid at temperature and humidity of 25 ± 2 ◦C
and 30 ± 5%, respectively. A small drop of distilled water (2–3 l)
was applied on the surface of samples. The shape of droplet was recorded by a Canon type digital camera after 10 s. The images were
transmitted to a personal computer for evaluation. Using an image
analysis system (G2/G40),the contact angle values were calculated