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 2

Effect of immersion time on percentage inhibition efficiency of mild steel in 1N HCl at 30°C in the presence of optimum concentration of the plant extracts.

Name of the plant extract with optimum conc.	Inhibition efficiency (%)
	Time (h)
	3	6	9	12	15	18	21	24
6% v/v of Ocimum sanctum	99.6	98.5	98.0	97.3	96.5	96.0	95.3	94.8
8% v/v of Aegle marmelos	97.5	96.7	95.6	95.0	94.2	93.0	92.6	90.8
10% v/v of Solanum trilobatum	90.2	89.5	89.4	88.6	88.0	87.5	87.0	86.2