Synergetic Effect between Phenolic Extracts of Ammi visnaga and Zea mays Formulation on the Corrosion of Mild Steel in 1 M HCl Solution

Table 2

EIS parameters and inhibition efficiencies for mild steel in 1 M HCl in the presence and absence of different concentrations of HE (AV)/HE (ZM) at 298 K.

Cinh (gL^−1)	Rs	Rct	Qdl	Cdl	Rf	Qf	Rp	χ^2	ɳEIS%
1 M HCl	1.1	58.1	373.3	118.8	—	—	59.1	0.011	—
0.01 HE (AV)/0.05 HE (ZM)	2.1	533.4	145.1	34.8	85.3	55.2	618.7	0.022	90.44
0.01 HE (AV)/0.08 HE (ZM)	2.2	598.1	137.2	27.6	109.9	45.8	708.1	0.014	91.65
0.01 HE (AV)/0.10 HE (ZM)	2.7	656.3	126.1	25.9	165.9	38.9	822.2	0.013	92.81
0.01 HE (AV)/0.15 HE (ZM)	6.2	751.5	37.3	21.6	510.4	28.6	1261.9	0.034	95.31
0.01 HE (AV)/0.20 HE (ZM)	6.5	1447	27.2	19.6	325.8	26.8	1703.4	0.004	96.53

Note: R_f, R_ct, and R_s in Ωcm², Q_f and Q_dl in µF Sⁿ⁻¹ cm⁻², and C_dl and C_f in µF cm⁻².