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

Table 4

Activation parameters for mild steel in industrial water in the absence and presence of different concentrations of SB₁ and SB₂.

Inhibitor	Concentration (M)	K	𝐸𝑎^∗ (kJ mol^−1)	Δ𝐻𝑎^∗ (kJ mol^−1)	Δ𝐻𝑎^∗ = 𝐸𝑎^∗ − RT (kJ mol^−1)	Δ𝑆𝑎^∗ (J mol^−1 K^−1)
SB1	Blank	2378546	35.24	32.60	32.39	−131.69
	4.46×10^−4	7341105	39.39	36.75	36.53	−122.32
	8.93×10^−4	5797863	39.74	37.10	36.89	−124.29
	13.39×10^−4	7025099	40.93	38.29	38.07	−122.69
	17.86×10^−4	7873395	41.87	39.23	39.02	−121.73
	22.32×10^−4	12522029	43.64	41.00	40.79	−117.88
	26.79×10^−4	8268800	43.17	40.53	40.32	−121.33
SB2	Blank	2378546	35.24	32.60	32.39	−131.69
	4.51×10^−4	37393221	43.97	41.33	41.12	−108.78
	9.01×10^−4	62582735	46.01	43.37	43.16	−104.50
	13.51×10^−4	59352215	46.39	43.75	43.54	−104.94
	18.02×10^−4	91972484	47.88	45.24	45.03	−101.29
	22.52×10^−4	211344487	50.47	47.83	47.61	−94.38
	27.03×10^−4	56288454	47.31	44.67	44.45	−105.38