Corrosion Behavior and Adsorption Thermodynamics of Some Schiff Bases on Mild Steel Corrosion in Industrial Water Medium

Table 2

𝐸_corr, 𝐼_corr, 𝑅_ct and IE (%) obtained from polarization and impedance measurements for mild steel in industrial water medium containing various concentrations of SB₁, and SB₂ at 30°C.

Inhibitor	C (M)	EIS			Polarization
		R ct (Ω cm^2)	C dl (μF cm^−2)	IE %	E corr (mV)	I corr (μA cm^−2)	IE %
SB1	Blank	251	189.2	—	−527	76.41	—
	4.46×10^−4	440	121.8	42.95	−499	42.32	44.61
	8.93×10^−4	653	82.1	61.56	−494	30.13	60.57
	13.39×10^−4	911	58.9	72.45	−488	21.54	71.81
	17.86×10^−4	1315	40.8	80.91	−480	15.64	79.53
	22.32×10^−4	1380	38.9	81.81	−482	13.79	81.95
	26.79×10^−4	1690	31.7	85.15	−483	10.24	86.60
SB2	Blank	251	189.2	—	−527	76.41	—
	4.51×10^−4	501	107.2	49.90	−495	39.12	48.80
	9.01×10^−4	723	74.1	65.28	−490	29.44	61.47
	13.51×10^−4	958	55.9	73.80	−482	20.11	73.68
	18.02×10^−4	1183	45.3	78.78	−485	16.98	77.78
	22.52×10^−4	1314	40.8	80.90	−487	15.33	79.94
	27.03×10^−4	1438	37.3	82.55	−488	13.84	81.89