Table 4.

Electrochemical impedance parameters for mild steel dipped in 15% HCl in the absence and presence of different concentrations of biotin.

solutionRs (Ω cm2)Rct (Ω cm2)nY° (Ω−1sn/cm2)τ (sec)Cdl (μF cm2)χ2η %surf. coverage θ
1 M HCl1.2180.828248496.279.80.0006
biotin 50 ppm2.9660.830115157.040.80.0008730.73
biotin 100 ppm1.8940.83910849.436.10.0033810.81
biotin 200 ppm2.62550.8597119.627.90.0019930.93
biotin 500 ppm2.15470.880347.312.50.0011970.97