The corrosion performances of S-0,

The corrosion performances of S-0, S-0.2 and S-0.4 coatings were measured on CS350 electrochemical workstation. The corrosion current density and Nyquist plots of the coatings were collected in 3.5 wt% NaCl solution using a three-electrode cell (Fig. 3). The as-prepared S-0, S-0.2 and S-0.4 coatings were employed as working electrodes, platinum foil as counter, and saturated calomel electrode (SCE) as reference.