Surface Protection of Carbon Steel by Hexanesulphonic Acid-Zinc Ion System

Table 6

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

Samples	RMS (𝑅𝑞) roughness; (nm)	Average (𝑅𝑎); roughness; (nm)	Maximum peak-to-valley height (nm)
1. Polished carbon steel	4.33	3.41	35.28
2. Carbon steel immersed in dam water (blank)	31.9	24.9	420.3
3. Carbon steel immersed in dam water + SHXS (1.35×10^−3 mol/L) + Zn^2+ (1.04×10^−4 mol/L)	4.38	3.71	27.21