Table 1 EIS parameters for reinforcement steel in SCPS in the presence of various concentrations of the Q-32 corrosion inhibitor with different pH at 20 °C.

C_inh µmol L⁻¹	R_s, Ω cm⁻²	R_po, Ω cm⁻²	CPE_po		R_ct, Ω cm⁻²	CPE_ct		C_dl, μF cm⁻²	\(\theta\)	IE, %
C_inh µmol L⁻¹	R_s, Ω cm⁻²	R_po, Ω cm⁻²	Y_po × 10^–6 sⁿ Ω⁻¹ cm⁻²	n₁	R_ct, Ω cm⁻²	Y_ct × 10^–6 sⁿ Ω⁻¹ cm⁻²	n₂	C_dl, μF cm⁻²	\(\theta\)	IE, %
pH 7
Blank	7.64	–	–	–	290 ± 3.15	830.7	0.593	312.73 ± 2.96	–	–
5	8.56	–	–	–	513 ± 2.39	617	0.576	264.56 ± 2.67	0.434	43.5
10	9.32	–	–	–	712.8 ± 4.87	409	0.677	227.15 ± 4.54	0.593	59.3
15	8.46	–	–	–	1,040 ± 3.92	230.1	0.853	179.84 ± 3.49	0.721	72.1
20	9.29	–	–	–	1,210 ± 2.41	123.7	0.851	88.70 ± 2.72	0.760	76.0
pH 9
Blank	8.26	23.00	822.1	0.816	340 ± 5.13	448.4	0.801	281.03 ± 4.72	–	–
5	7.57	33.71	1,325	0.756	650.5 ± 4.25	359.5	0.764	229.49 ± 4.24	0.477	47.7
10	7.83	37.13	4,143	0.983	898.9 ± 7.84	281.3	0.794	196.90 ± 7.39	0.621	62.2
15	7.95	42.53	4,925	0.530	1,361.8 ± 5.93	148.4	0.876	118.34 ± 5.59	0.750	75.0
20	8.58	51.25	6,036	0.872	2,163.5 ± 6.71	99.5	0.647	43.042 ± 6.33	0.842	84.3
pH 12
Blank	7.897	71.66	989.2	0.924	1,210 ± 4.39	109.1	0.84	74.18 ± 4.14	–-	–-
5	6.380	101.6	719.6	0.599	2,582 ± 8.67	77.19	0.845	57.42 ± 8.13	0.531	53.1
10	7.299	241.2	583.2	0.950	3,990 ± 7.16	47.27	0.799	31.07 ± 6.73	0.696	69.7
15	7.814	481.8	380.5	0.694	7,591 ± 7.42	37.48	0.787	26.67 ± 7.01	0.840	84.1
20	7.938	695.6	119.3	0.841	18,282 ± 6.31	31.15	0.691	24.21 ± 5.95	0.933	93.4

Quick links

Search