Inhibitory action of safflower (Carthamus tinctorius) extract (SE) was investigated in hydrochloric acid
solution through electrochemical (polarization, EIS), and surface analysis (optical microscopy/atomic
forcemicroscopy (AFM)/scanning electronmicroscopy (SEM)/energy dispersive spectroscopy (EDS))
techniques. In addition, Inhibition efficiency was predicted by neural network (NN) modeling in elevated
temperatures and different acid concentrations. The thermodynamic adsorption parameters propose
that this inhibitor retard both cathodic and anodic processes through physical adsorption and
blocking the active corrosion sites. Surface analysis techniques confirm the inhibitor adsorption on
themetal surface, which is in accordance with the variation of apparent activation energy of corrosion.
Finally, inhibition efficiency is discussed in terms of protective film formation.
کلید واژگان :
Acid inhibition, AFM, electrochemical calculation,mild steel,modeling studies, SEM
