In all three cases, a decrease in the corrosion current density is observed; however, a displacement of the corrosion potential towards more active potentials characterizes a cathodic inhibitor
and in the opposite case to an anodic type.
Hence, the second assumption was made that Lawsonia inermis act as cathodic inhibitor
The steel rebar has difference in [E.sub.corr] more than [+ or -] 85 mV versus saturated calomel electrode (SCE) when it is exposed in inhibitor; such type of inhibitor works as anodic or cathodic inhibitor
tend to be metal salts (of Ca, Zn, Mg, and Ni) that interact with the hydroxyls produced at cathodes and deposit insoluble hydroxides at those sites.
, such as inorganic salts of magnesium and manganese, suppress corrosion at the cathode by forming insoluble deposits with hydroxyl ions in neutral environments.