with the concentration range from 10 mg/L
to 1000 mg/L in 1 M HCl, and the change of IE (%) and
corrosion rate (g/m2 • h) with the inhibitor concentration
were summarized in Figures 2 and 3. From the table, it
was found that the extract can inhibit the corrosion with
different efficiency under different concentrations, and
the IE increases with the concentration. For WE, the IEs
reach to 72.0% and 83.2% with the concentration of
100 mg/L and 1000 mg/L respectively, while the IEs of
AE only reach to 66.7% and 77.7% respectively.
Tafel polarisation measurements