Archive / Том LVI 2019

Оksana HERTSYK¹, Myroslava KOVBUZ¹, Lidiya BOICHYSHYN¹, Tetiana HULA¹, Nataliia PANDIAK²

¹Ivan Franko National University of Lviv Kyryla and Mefodia Str. 6, 79005 Lviv, Ukraine
²Ukrainian National Forestry University, Gen. Chuprynka Str. 103, 79057 Lviv, Ukraine

DOI: https://doi.org/10.37827/ntsh.chem.2019.56.101

MODIFICATION OF AMORPHOUS ALLOYS BASED ON ALUMINUM BY OLIGOMERIC COATINGS

The influence of modification on the electrochemical properties of the amorphous metallic alloys based on Al: Al_87.0Y_5.0Ni_8.0, Al_87.0Gd_5.0Ni_8.0, Al_87.0Gd_5.0Ni_4.0Fe_4.0, Al_87.0Y4.0Gd_1.0Ni_8.0, Al_87.0Y_4.0Gd_1.0Ni_4.0Fe_4.0 by heterofunctional oligoperoxides based on vinyl acetate, 2-tert-butylperoxy-2-methyl-5-hexen-3-yne and maleic anhydridehas (OP-1) have been investigated by cyclic voltammetry. According to experimental results of voltammetry studies - corrosion current and potential, in order of reducing corrosion resistance the following series of amorphous alloys have been established:
- by corrosion current:
Al_87.0Y_4.0Gd_1.0Ni_8.0 > Al_87.0Gd_5.0Ni_4.0Fe_4.0 > Al_87.0Y_4.0Gd_1.0Ni_4.0Fe_4.0 > Al_87.0Gd_5.0Ni_8.0 > Al_87.0Y_5.0Ni_8.0.
- by corrosion potential:
Al_87.0Gd_5.0Ni_8.0, Al_87.0Y_4.0Gd_1.0Ni_8.0 > Al_87.0Gd_5.0Ni_4.0Fe_4.0 > Al_87.0Y_5.0Ni_8.0 > Al_87.0Y_4.0Gd_1.0Ni_4.0Fe_4.0.
They confirmed the highest durability of the Al_87.0Y_4.0Gd_1.0Ni_8.0 sample. At cyclic voltammograms of all investigated alloys in 1% aqueous-ammonia solution of OP-1 it is observed the increasing of currents (peaks) at potentials range (-0.75 ÷ -0.25 V). At the contact with the solution and cyclic scanning of the potential, the height of such peak is decreasing for all samples. The largest change is observed in case of Al_87.0Y_5.0Ni_8.0 and Al_87.0Y_4.0Gd_1.0Ni_8.0. Investigation of initial samples of alloys in an aggressive medium of ammonium hydroxide showed a decrease in their corrosion resistance. The least corrosion-resistant under the given conditions was an alloy Al_87.0Gd_5.0Ni_4.0Fe_4.0, for which there was also an increase in the values ba and bc, which characterize the surface dissolution rate. The assessment of the relationship of oligomeric coatings to the surfaces of the tape, especially the contact side, also highlighted alloys with the Fe addition. Thus, based on a comprehensive investigation of the modification of amorphous alloys surfaces with oligomeric coatings, it has been found that the formation and properties of formed surface layers are significantly dependent on the elemental composition of the alloy, in particular, the presence of Fe.

Keywords: amorphous metallic alloy, aluminum, corrosion resistance, oligomeric coatings.

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How to Cite

Hertsyk О., Hula T., Boichyshyn L., Kovbuz M., Pandiak N. MODIFICATION OF AMORPHOUS ALLOYS BASED ON ALUMINUM BY OLIGOMERIC COATINGS Proc. Shevchenko Sci. Soc. Chem. Sci. 2019 Vol. LVI. P. 101-111.