EIS data of low-carbon steel in 0.5 mol L⁻¹ HCl without and with different concentrations of the DMIH compound at 298 K.

[DMIH] (ppm)	R s (Ω cm2)	R ct (Ω cm2)	n	C dl × 10−6 (F cm−2)	Y o (mΩ−1 sn cm−2)	θ	χ 2 × 10−3 (%)	IEEIS (%)
Blank	4.88	48.6	0.84	108	0.180	—	3.42	—
50	5.14	134.7	0.82	38	0.135	0.639	4.15	63.9 ± 0.3
100	4.18	144.0	0.79	30	0.098	0.663	6.32	66.3 ± 0.3
150	5.89	164.6	0.77	22	0.070	0.705	5.04	70.5 ± 0.2
200	4.51	213.3	0.78	19	0.061	0.772	3.68	77.2 ± 0.4
250	4.43	309.6	0.79	14	0.052	0.843	7.55	84.3 ± 0.1
300	5.24	404.8	0.80	11	0.041	0.888	5.48	88.8 ± 0.2