Table 5.

The slopes of the Bode impedance magnitude plots at intermediate frequencies (S) and the maximum phase angles (α) for mild steel in 15% HCl in the absence and presence of biotin.

conc. (ppm)Sα°
1 M HCl0.42938.4
biotin 50 ppm0.48261.3
biotin 100 ppm0.53162.4
biotin 200 ppm0.62978.7
biotin 500 ppm0.72079.2