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THE INFLUENCE OF GRAIN SIZE OF PURE IRON METAL ON CORROSION INHIBITION IN PRESENCE OF SODIUM NITRITE

School of Metallurgy & Materials Engineering, College of Engineering, University of Tehran, P.O. Box 11365-4563, Tehran, Iran

Corresponding author. Tel.: +61 416 819 351; Fax: +61 86444 8118.

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CHANGIZ DEHGHANIAN

School of Metallurgy & Materials Engineering, College of Engineering, University of Tehran, P.O. Box 11365-4563, Tehran, Iran

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https://doi.org/10.1142/S2010194512002760Cited by:4 (Source: Crossref)

Abstract

The effects of grain size reduction on the corrosion inhibition of sodium nitrite were investigated using polarization curves and electrochemical impedance spectroscopy (EIS). Nanocrystalline iron (~ 45 nm) was produced by pulse electrodeposition using citric acid bath. The grain size of a nanocrystalline surface was analyzed by X-ray diffractometry (XRD) and field emission scanning electron microscopy (FESEM). The most intensive first-order peak (211) of the XRD patterns was taken for detailed analysis using a Gaussian fitting curve. The tests were carried out in 25 mg/lNaCl + 57 mg/lNa₂SO₄ with different concentration of sodium nitrite aqueous solutions.

The results revealed that due to the adsorption process which leads to the formation of a protective layer with a greater charge transfer resistance 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. The standard free energy of adsorption (ΔG_ads) revealed a strong interaction between inhibitor and nanocrystalline surface. This was attributed to the increased number of the active sites caused by nanocrystalline surface.

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