The Inhibitory Action of the Extracts of Adathoda vasica, Eclipta alba, and Centella asiatica on the Corrosion of Mild Steel in Hydrochloric Acid Medium: A Comparative Study

Table 5

Corrosion rate for the mild steel in 1N HCl at different temperatures obtained by weight loss method in the absence of the inhibitor and presence of the optimum concentration of the plant extracts.

Name of the plant	Temperature (°C)	Corrosion rate (mmpy)	Inhibition efficiency (%)
Blank	30	30.67
	40	50.12
	50	70.79
	60	108.43
	70	125.89
	80	177.82
6% in v/v of Adathoda vasica	30	0.30	99.0
	40	0.60	98.8
	50	1.26	98.2
	60	2.63	97.6
	70	5.25	95.8
	80	10.02	94.4
8% in v/v of Eclipta alba	30	0.12	99.6
	40	0.62	98.7
	50	1.78	97.5
	60	4.47	95.8
	70	11.22	93.7
	80	23.00	87.1
10% in v/v of Centella asiatica	30	4.50	85.32
	40	7.32	85.39
	50	10.40	85.30
	60	15.91	85.32
	70	18.52	85.28
	80	28.21	84.14