Table 3. Polarization Parameters for J55 Steel in 3.5% NaCl at a Scan Rate of 1 mV/s in the Absence and Presence of Different Porphyrins.

	Tafel data
solution	Ecorr (mV vs SCE)	Icorr (mA cm–2)	ba (mV d–1)	–bc (mV d–1)	η (%)	surface coverage θ
3.5% NaCl	–735	0.98	78	117
PF-1 (400 ppm)	–761	0.14	89	80	86	0.86
PF-2 (400 ppm)	–750	0.07	97	98	93	0.93