International Journal of Corrosion / 2013 / Article / Tab 3

Research Article

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

Table 3

Electrochemical parameters for zinc in absence and presence of different concentrations of Marjoram extract in 1.0 M HCl solution at 30°C obtained from Tafel polarization curves.

Inhibitor concentration (ppm)−E corr (mV SCE) (V dec−1) (V dec−1) (mA cm−2) IE (%)

HCl (1 M)9960.430.492.41
1009890.560.560.930.6161.40
2009850.630.600.650.7373.00
3009780.710.680.470.8080.50
4009760.800.730.240.9090.00
5009740.860.790.180.9292.50

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