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

Table 4

Corrosion kinetic parameters for mild steel in 1 mol L⁻¹ HCl in the absence and presence of different concentrations of GAI at various immersion periods in the temperature range of 303 K–323 K.

Immersion period (hours)	Concentration; (ppm)	(kJmol^−1)	(kJmol^−1)	(Jmol^−1 k^−1)
1	Blank	56.66	54.05	−103.34
	10	29.76	27.16	−194.30
	20	28.19	25.58	−200.49
	40	25.71	23.11	−210.83
	60	34.11	31.50	−185.04
2	Blank	78.48	75.88	−35.21
	10	56.71	54.11	−111.30
	20	46.96	44.35	−144.01
	40	39.65	37.05	−169.54
	60	53.27	50.67	−127.56
4	Blank	90.82	88.22	04.71
	10	40.83	38.23	−163.24
	20	19.50	16.90	−233.771
	40	26.14	23.54	−213.76
	60	25.97	23.37	−214.88
6	Blank	94.94	92.34	17.32
	10	38.87	36.27	−172.95
	20	28.63	26.03	−206.98
	40	22.53	19.93	−226.63
	60	33.62	31.01	−192.11
12	Blank	111.78	109.18	70.57
	10	60.50	57.90	−104.31
	20	60.60	58.00	−105.37
	40	48.47	45.87	−146.15
	60	42.92	40.32	−164.63