Potentiodynamic polarization parameters 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)	−Ecorr (mV vs. SCE)	β a (mV dec−1)	−βc (mV dec−1)	I corr (mA cm−2)	θ	IEp (%)
Blank	391	242	322	1.52	—	—
50	392	235	213	0.55	0.638	63.8 ± 0.1
100	384	220	158	0.50	0.671	67.1 ± 0.4
150	407	210	148	0.45	0.704	70.4 ± 0.2
200	388	185	122	0.38	0.750	75.0 ± 0.3
250	406	140	95	0.25	0.836	83.6 ± 0.1
300	396	120	50	0.17	0.888	88.8 ± 0.1