Corrosion and passivity of metals in methanol solutions of electrolytes |
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Authors: | J Banaś B Stypuła K Banaś J Światowska-Mrowiecka M Starowicz U Lelek-Borkowska |
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Institution: | (1) Department of Chemistry and Corrosion of Metals, Faculty of Foundry Engineering, AGH–University of Science and Technology, Reymonta 23 St., 30-059 Cracow, Poland;(2) Department of Physical Chemistry and Electrochemistry, Faculty of Non-Ferrous Metals, AGH–University of Science and Technology, Mickiewicza 30 Av., 30-059 Cracow, Poland |
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Abstract: | Electrochemical and corrosion behaviour of metals in alcohols are the subject of numerous investigations because of the application
of mentioned solvents in chemical engineering, production of oxide nanoparticles (sol-gel techniques) and application of alcohols
as fuels. Despite relatively rich bibliography related to electro-catalytic oxidation of alcohols on metal surface in mixed
aqueous–alcohol solutions, the knowledge of the mechanism of reactions on metal/anhydrous alcohol interface is still not sufficient.
Anodic oxidation of metal surface in alcohol leads to several electro-catalytic reactions with formation of surface compounds
being the product of metal and alcohol oxidation. Identification of these products is very difficult. Therefore, our knowledge
of the composition and structure of passive films or corrosion products on metal surface in anhydrous alcohol solvents is
poor. Our paper presents the investigations of anodic behaviour of metals (Cu, Zn, Fe, Ni, Al and Ti) and semiconductors (p-Si)
in methanol solutions of electrolytes, performed in our laboratory within the last 10 years. On the base of electrochemical
measurements (linear sweep voltammetry, electrochemical impedance spectroscopy), spectroscopic investigations (X-ray photoelectron
spectroscopy, ultraviolet photoelectron spectroscopy and low-energy electron diffraction) and scanning electron microscopy
techniques, the role of metal–alcohol intermediates in the formation of surface and soluble compounds is discussed. The practical
application of electrochemical etching of metals as a method of production of micro- and nanoparticles of metals and oxides
is also shown. |
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