PROCEEDINGS OF THE SHEVCHENKO SCIENTIFIC SOCIETY

Chemical Sciences

Archive / Volume LXVI 2021

Khrystyna KHRUSHCHYK, Lidiya BOICHYSHYN, Oksana SAPATSINSKA

Ivan Franko National University of Lviv, Kyryla and Mephodiya Str., 6, 79005 Lviv, Ukraine
e-mail: khrushchyk.chem@gmail.com

DOI: https://doi.org/10.37827/ntsh.chem.2021.66.068

PASSIVATION OXIDATION OF THE SURFACE OF AMA Al87Ni8Y5 IN THE PRESENCE OF OXYGEN-CONTAINING INHIBITORS

The corrosion resistance of the amorphous metal alloy AMAs Al87Ni8Y5 in a solution of 0.5 M sodium chloride was studied. It was established by the method of potentiometry that spontaneous oxidation of the surface in the presence of KMnO4, K2Cr2O7 with a concentration of 4·10–3 mol/l occurs with a shift of the surface potential to the anode side. The potentials and current density of corrosion were determined by voltammetry. The introduction of potassium dichromate in 0.5 M NaCl solution leads to a significant shift of Ecorr in the anode direction, which indicates the difficulty of corrosion processes.
However, the corrosion currents in the solutions of all inhibitors remain unchanged and fluctuate in the range of 10–8 A/cm2. Characteristic of all VA of Al87Ni8Y5, which are removed in the presence of the inhibitor is a wide passivation area. The widest passivation region is observed in the background electrolyte solution with the addition of NaNO2 and KMnO4. To establish the inhibitory effect of inorganic applications, the AMAs was polarized at a potential of –180 mV, the ion diffusion coefficients to the phase separation limit were calculated to be reduced by 7 orders of magnitude at the potentiostatic polarization of the AMAs at –180 mV. The surface of the AMAs was studied by electron scanning microscopy and X-ray energy dispersion analysis.
The most noticeable change in the elemental composition on the surface of AMAs Al87Ni8Y5 in solution with the addition of potassium permanganate. Surface microphotographs indicate that defect-free surface protective layers have formed in this solution. Based on the analysis of the above experimental results, we can conclude that oxygen-rich applications (NaNO2, K2Cr2O7 and KMnO4) significantly slow down the release of Al3+ ions, which occurs at a potential of –180 mV. Therefore, the anions of oxygen-containing salts that stimulate the uniform oxidation of AMAs thereby inhibit the release into solution of the products of the electrochemical oxidation process of surface metals, but do not prevent the initial stage of interaction of surface metals of AMAs with Cl– ions.
The alloying element Y at the appropriate potential in the presence of oxygen-containing salts (K2Cr2O7, KMnO4, NaNO2) is oxidized to Y3+, «cures» the defects of the insoluble passivation oxide-hydroxide layer of metal components on the surface of AMAs Al87Ni8Y5.

Keywords: oxygen-containing inhibitors, amorphous metal alloys, corrosion resistance, passivation layers.

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    How to Cite

    KHRUSHCHYK Kh., BOICHYSHYN L., SAPATSINSKA O. PASSIVATION OXIDATION OF THE SURFACE OF AMA Al87Ni8Y5 IN THE PRESENCE OF OXYGEN-CONTAINING INHIBITORS. Proc. Shevchenko Sci. Soc. Chem. Sci. 2021 Vol. LXVI. P. 68-79.

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