Marjoram Extract as Corrosion Inhibitor for Dissolution of Zinc in 1.0 M HCl

Table 1

Corrosion parameters for zinc in aqueous solution of 1.0 M HCl in absence and presence of different concentrations of marjoram extract 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	341	98.00	61.30
200	243	73.60	71.00
300	183	52.40	79.30
400	98	28.00	88.90
500	69	21.20	91.80