Abstract
Abstract The effect of grain size reduction on the corrosion inhibitor adsorption of nanocrystalline Fe produced by pulse electrodeposition was characterized using tafel polarization curves and electrochemical impedance spectroscopy. The grain size of a nanocrystalline surface was determined by means of scanning electron microscopy. The tests were carried out in 0.1 M sodium perchlorate (NaClO4) and 0.1 M sodium sulphate (Na2SO4) aqueous solutions separately. Results obtained revealed that the inhibition effect and corrosion protection of sodium nitrite inhibitor in near-neutral aqueous solutions increased as the grain size decreased from microcrystalline to nanocrystalline. This was attributed to the increased number of the active sites caused by nanocrystalline surface.
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