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Investigation of Cerium (iii) activated ceria nanoparticles as corrosion inhibitors for carbon steel

The present work investigated the corrosion protection performance of Ce(III) activated-cerium(IV) oxide nanoparticles for carbon steel in a NaCl solution. Ceria nanoparticles were synthesized by homogeneous precipitation in ethanol/water mixed solvent. The obtained CeO2 nanoparticles were characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM). | Vietnam Journal of Science and Technology 56 (2) (2018) 165-173 DOI: 10.15625/2525-2518/56/2/10977 INVESTIGATION OF CERIUM (III) ACTIVATED-CERIA NANOPARTICLES AS CORROSION INHIBITORS FOR CARBON STEEL A. S. Nguyen1, *, T. D. Nguyen1, T. T. Thai1, T. X. H. To1, 2 1 2 Institute for Tropical Technology, VAST, 18 Hoang Quoc Viet, Hanoi, Vietnam Graduate University of Science and Technology, VAST, 18 Hoang Quoc Viet, Hanoi, Vietnam * Email: nason@itt.vast.vn Received: 13 December 2017; Accepted for publication: 28 February 2018 Abstract. The present work investigated the corrosion protection performance of Ce(III) activated-cerium(IV) oxide nanoparticles for carbon steel in a NaCl solution. Ceria nanoparticles were synthesized by homogeneous precipitation in ethanol/water mixed solvent. The obtained CeO2 nanoparticles were characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM). The corrosion inhibition action of the activated nanoparticles by cerium(III) ions on carbon steel in NaCl solution was evaluated by electrochemical measurements (electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization). Then, the effect of cerium salt activated-CeO2 on the protection properties of poly-vinyl-butyral (PVB) coating deposited onto carbon steel plate was studied by salt spray test. The obtained results showed that the salt activated-nanoparticles are anodic corrosion inhibitors. The presence of Ce(III) activated CeO2 in the coating improved the barrier properties and corrosion protection performance of the PVB coating. No swellings of coating were observed after 48 hours of exposure in salt spray chamber. Keywords: corrosion, CeO2, activated nanoparticles, EIS, salt spray test. Classification numbers: 2.5.1, 2.5.3. 1. INTRODUCTION Chromium hexavalent (Cr(VI)) compounds were well-known to have excellent corrosion protection that make them become standard corrosion inhibitors in industry painting [1-3]. However, the Cr(VI) species