Corrosion Inhibition and Adsorption Properties of Ethanolic Extract of Calotropis for Corrosion of Aluminium in Acidic Media

Table 5

Thermometric reaction for aluminium in 2 N and 3 N sulphuric acid with ethanolic extract of leaves, latex, and fruit of Calotropis procera.

Inhibitor; concentration	Reaction; number (RN) 2 N	Inhibition; efficiency (%)	Reaction; number (RN) 3 N	Inhibition; efficiency (%)
Uninhibited	1.26		1.91
Leaves
0.12	0.81	35.65	127	33.63
0.24	0.76	39.21	1.20	37.13
0.36	0.70	44.27	1.15	39.69
0.48	0.51	59.53	0.80	58.07
0.60	0.40	67.83	0.67	64.60
Latex
0.12	0.83	34.15	1.26	34.05
0.24	0.78	37.94	1.25	34.67
0.36	0.71	43.32	0.95	50.08
0.48	0.54	57.15	0.84	51.33
0.60	0.41	67.43	0.76	62.66
Fruit
0.12	0.78	38.02	1.38	27.83
0.24	0.71	43.40	1.32	31.07
0.36	0.64	49.01	1.11	41.67
0.48	0.48	61.34	0.75	60.63
0.60	0.34	72.96	0.59	69.03