Table 3.

Electrochemical parameters of the Fe and Fe-PEI samples obtained from the Tafel analysis of polarization curves measured at 37 ± 1 °C in the Hanks’ solution. Corrosion current (i_corr), corrosion current density (j_corr), corrosion potential (E_corr), polarization resistance (PR), corrosion rate (CR).

Sample	Ecorr (V)	icorr (A)	jcorr (μA cm−2)	PR (Ω cm−2)	CR (mm y−1)
Fe	−0.627	11.91 × 10−5	1.18 × 10−2	0.017	0.045
Fe-PEI1	−0.722	37.11 × 10−5	4.52 × 10−2	0.041	0.172
Fe-PEI2	−0.687	102.95 × 10−5	3.10 × 10−2	0.039	0.118
Fe-PEI3	−0.658	5.39 × 10−5	15.49 × 10−2	4.460	0.590