A Comparative Study of the Inhibitory Effect of the Extracts of Ocimum sanctum, Aegle marmelos, and Solanum trilobatum on the Corrosion of Mild Steel in Hydrochloric Acid Medium

Table 1

Corrosion parameters obtained from weight loss measurements for mild steel in 1N HCl containing various concentrations of the plant extracts.

Name of the plant extract	Conc. of the extract (% in v/v)	Corrosion rate (mmpy)	Inhibition efficiency (%)	Surface coverage (θ)
Ocimum sanctum	Blank	30.67	—	—
	2.0	2.39	92.2	0.9221
	4.0	1.10	96.4	0.9641
	6.0	0.12	99.6	0.9961
	8.0	1.08	96.5	0.9648
	10.0	1.32	95.7	0.9570
Aegle marmelos	Blank	30.67	—	—
	2.0	3.81	87.6	0.8758
	4.0	3.03	90.1	0.9012
	6.0	2.02	93.4	0.9341
	8.0	0.76	97.5	0.9752
	10.0	0.76	97.5	0.9752
Solanum trilobatum	Blank	30.67	—	—
	2.0	12.75	58.4	0.5843
	4.0	8.42	72.5	0.7255
	6.0	6.59	78.5	0.7851
	8.0	5.21	83.0	0.8301
	10.0	3.00	90.2	0.9022