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

Table 3

Mass loss data for aluminium in 1.0 N sulfuric acid with ethanolic extract of leaves, latex, and fruit of Calotropis procera.

Inhibitor Concentration	Mass loss (gm)	Inhibition efficiency (%)	Corrosion rate (mmpy)	Surface coverage (θ)
Uninhibited	2460		44.3
Leaves
0.12	1242	49.51	22.3	0.4951
0.24	935	61.99	16.8	0.6199
0.36	721	70.69	12.9	0.7069
0.48	663	73.04	11.9	0.7304
0.60	548	77.72	9.87	0.7772
Latex
0.12	1263	48.58	22.7	0.4858
0.24	931	62.15	16.7	0.6215
0.36	748	69.59	13.4	0.6959
0.48	625	74.59	11.2	0.7459
0.60	520	78.86	9.37	0.7886
Fruit
0.12	1186	51.78	21.3	0.5178
0.24	958	61.05	17.2	0.6105
0.36	712	71.05	12.8	0.7105
0.48	643	73.86	11.5	0.7386
0.60	574	76.66	10.3	0.7666