Table 7: AFM data for carbon steel surface immersed in inhibited and uninhibited environment.

SamplesRMS ( ) roughness (nm)Average ( ) roughness (nm)Maximum peak-to-valley height (nm)

Polished carbon steel (Control)4.333.4135.28
Carbon steel immersed in sea water (blank)17.1013.5892.28
Carbon steel immersed in sea water + HE (8 mL)
 + Zn2+ 25 (ppm)
11.87.6527.47