Naturally Occurring Elettaria cardamomum Extract as a Corrosion Inhibitor for the Dissolution of Zinc in 1.0 M HCl

Table 1

Corrosion parameters for zinc in an aqueous solution of 1.0 M HCl in absence and presence of different concentrations of inhibitor from weight loss measurements at 30°C for 1/2 h.

Inhibitor concentration (ppm)	Weight loss (mg dm^−2)	CR (mg dm^−2 h^−1)	IE (%)
Blank	843	252.90	—
100	311	93.30	63.10
200	206	61.80	75.60
300	151	45.30	82.00
400	74	22.20	91.30
500	54	16.20	93.60