Synthesis, characterization and anticorrosive properties of pseudo-binary oxide nanomaterials

Birdeanu, Mihaela and Orha, Corina: Synthesis, characterization and anticorrosive properties of pseudo-binary oxide nanomaterials. In: Proceedings of the International Symposium on Analytical and Environmental Problems, (24). pp. 220-221. (2018)

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This paper presents some results of the study regarding the corrosion inhibition properties evaluated in 0.1 M NaCl environment of drop casting deposited on steel, using Zn3Ta2O8 and Zn3Nb2O8 nanomaterials. Zn3Ta2O8 and Zn3Nb2O8 nanomaterials were obtained by hydrothermal method. The starting materials used during the synthesis were: tantalum (V) oxide - Ta2O5(99.99%, Merck), niobium (V) oxide - Nb2O5 (99.99%, Merck) and zinc acetate dihydrate – (CH3COO)2Zn x 2H2O Merck, 99.5 %) while keeping the molar ratio at 1:3. The pH of the obtained mixtures was adjusted to 12 by using sodium hydroxide (NaOH) solution of 10 M concentration. The resulting suspensions were transferred into Teflon-lined stainless steel autoclaves and then these were introduced in an oven at 220 0C for 8 h long. The filling degree of the used autoclaves was set at 70%. The resulting white precipitates were filtrated, and then five times washed with distilled water and, finally, three times with ethylic alcohol. In the next stage, the precipitate was dried in an oven at 80 0C for 6 h [1-3]. The obtained materials were used for thin films depositions using the drop casting method. The depositions were realized on polished carbon steel electrode disks (10 mm diameter and 2 mm thick). The surfaces of the thin films realized using the pseudo-binary oxides nanomaterials Zn3Ta2O8 and Zn3Nb2O8 on electrode steels were morphological and topographical investigated using the scanning electron microscopy (SEM – Model Inspect S) and the atomic force microscopy (AFM - ModelNanosurf@ EasyScan 2 Advanced Research microscope) using the non-contact mode cantilever (scan size 2.3 µm x 2.3 µm). From AFM measurements, according to equations from [4], were determined the topographical parameters Sa – the average roughness and Sq – the mean square root roughness for each drop casting deposition’s surface on steel electrodes. The obtained values were calculated using the NanoSurf EasyScan 2 software. The corrosion behaviour was studied using on Voltalab potentiostat Model PGZ 402 with single compartment three-electrode cell. Platinum wire was employed as counter electrode and the saturated calomel electrode (SCE) was the reference electrode. All potentials reported in this article were referenced to the standard hydrogen electrode (SHE). Bare and coated steel substrates were used as working electrodes. The potentiodynamic polarization curves were analyzed using VoltaMaster 4, v.7.09 software. This software performed the Tafel fitting and calculated the values of the corrosion potential (Ecorr), corrosion current density (icorr) and corrosion rate (vcorr). The measurements were performed by sweeping the potential between − 700 and 100 mV, in 0.1 M NaCl electrolyte solution, at a scan rate (v) of 1 mV/s. The degree of the corrosion inhibition efficiency IE (%) has been calculated [5] for each drop casting deposition.

Item Type: Article
Journal or Publication Title: Proceedings of the International Symposium on Analytical and Environmental Problems
Date: 2018
Volume: 24
ISBN: 978-963-306-623-2
Page Range: pp. 220-221
Uncontrolled Keywords: Korrózió - elektrokémia - előadáskivonat
Additional Information: Bibliogr.: 221. p.
Date Deposited: 2019. Jan. 07. 09:54
Last Modified: 2019. Jan. 07. 09:54

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