Carbon steel sheets (150 mm × 10 mm × 2 mm) were used as
substrates. Sheets were polished with abrasive papers from 80 to
600 grades and cleaned with ethanol.
Polyuretane coating and polyuretane coatings containing
0.1 wt%nano ZnO and nano ZnO-APS attwo concentrations (0.1 wt%
and 0.5 wt%) were prepared and applied on carbon steel. The nano
ZnO and ZnO-APS were dispersed by magnetic stirring and then
sonication with ultrasonic waves at 35 kHz frequency for 20 min.
The liquid paint was applied by spin coating at 600 rpm for 1 min
and dried at ambient temperature for 7 days. The dry film thickness
was 30 ± 3 m (measured by Minitest 600 Erichen digital
meter)