Bee Wax Propolis Extract as Eco-Friendly Corrosion Inhibitors for 304SS in Sulfuric Acid

Table 5

Fitting results of EIS data for 304SS in 0.5 M H₂SO₄ without and with inhibitor.

Concentration of inhibitor (ppm)	(Ω cm^2)	(Ω cm^2)	CPE (F/cm^2)		(Ω^−1 cm^−2 )		IE (%)
0	8.03	24.96	377.65	0.996	0.0691	0.0141	—
1000	11.35	237.50	62.11	1.003	0.0029	1.0555	89.49
2000	11.86	290.84	59.95	1.001	0.0020	1.1640	91.42
3000	10.15	267.75	59.94	1.001	0.0021	0.9351	90.68
4000	8.59	257.96	63.35	1.001	0.0026	0.9171	90.32
5000	8.35	242.38	68.04	1.002	0.0031	0.8045	89.70
6000	7.99	196.39	67.93	1.003	0.0042	0.9013	87.29