*2.3. Coating Corrosion Resistance Test*

The corrosion resistance examination was done on PARSTAT 4000A potentiostat/galvanostat (Princeton Applied Research, Oak Ridge, TN, USA) using potentiodynamic polarization test in a 3.5 wt.% NaCl (Sigma-Aldrich, St. Louis, MO, USA) solution, using a three- electrode cell configuration. Pt sheet served as a counter electrode and saturated Ag/AgCl (Metrohm Autolab B.V., Almelo, the Netherlands) served as a reference electrode. The polarization resistance was detected in the range of ± 0.25 V with respect to the recorded corrosion potential at a scan rate of 0.1 mV/s. Prior to the test, the samples were placed in the 3.5 wt.% NaCl solution for 1 h in order to reach the steady state of a working electrode.
