Table 6.

Polarization parameters for mild steel in 15% HCl at a scan rate of 1 mV s−1 in the absence and presence of different concentrations of biotin.

Tafel data
conc. (ppm)Ecorr (V versus SCE)Icorr (µA cm−2)ba (mV d−1)bc (mV d−1)η (%)surface coverage θ
1 M HCl−0.42187075116
biotin 50 ppm−0.43229781102660.66
biotin 100 ppm−0.445987099890.89
biotin 200 ppm−0.460376693960.96
biotin 500 ppm−0.4492978109970.97