Corrosion Inhibition of Mild Steel in 1 mol L⁻¹ HCl Using Gum Exudates of Azadirachta indica

Table 5

Thermodynamic adsorption parameters for the different concentrations of GAI on mild steel in 1 mol L⁻¹ HCl at different immersion periods in the temperature range of 303–323 K.

Immersion periods (hr)	Temperature (K)	Intercept	Equilibrium constant () (M^−1)	(kJmol^−1)
1	303	0.0241	41.487	19.506
	313	0.0186	53.763	20.824
	323	0.0040	249.198	25.609
2	303	0.0136	73.390	20.943
	313	0.0109	91.619	22.211
	323	0.0032	307.786	26.176
4	303	0.0234	42.784	19.583
	313	0.0033	306.790	25.357
	323	0.0013	753.081	28.579
6	303	0.0067	149.806	22.741
	313	0.0021	469.507	26.464
	323	0.0005	2170.37	31.422
12	303	0.0022	448.287	25.502
	313	0.0033	306.710	25.356
	323	0.0012	810.184	28.775