Evaluation of Corrosion Inhibition Efficiency of Aluminum Alloy 2024 by Diaminostilbene and Azobenzene Schiff Bases in 1 M Hydrochloric Acid

Table 4

EIS data using SDS and SDA as inhibitors.

Electrochemical impedance spectroscopy data
Inhibitor	Concentration (ppm)	(Ω cm^-2)	(Ω cm^-2)	(Ω cm^-2)	(Hcm^-2)	ω (Hz)	CPE (μF cm^-2)		Cdl (μF cm^-2)	%
SDS	0	1.14	09	1.41	26.1	3.7	119	0.8805	67	—
	25	1.19	34.0	22.1	113	27	34	0.9138	24.1	73.5
	50	1.29	38.5	30.2	141	35	29	0.9216	22.3	76.6
	75	1.34	45.2	45.3	167	46	25	0.9281	19.1	80.1
	100	1.38	52.9	52.4	291	51	22	0.9299	14.3	83.0
SDA	25	1.29	40.5	11.3	161	44	29	0.9251	25.7	77.8
	50	1.32	44.6	32.9	227	55	17	0.9273	13.5	79.8
	75	1.38	52.0	39.3	281	62	15	0.9288	12.1	82.8
	100	1.43	66.7	40.3	301	71	13	0.9332	9.8	86.5