Issues »  Volume 42, Issue 7

Corrosion Resistance of Amorphous Alloys Fe$_{82}$Nb$_2$B$_{14}$REM$_2$ (REM = Y, Gd, Tb, Dy) in NaCl Medium

M.-O. M. Danyliak$^{1}$, L. M. Boichyshyn$^{2}$

$^{1}$G. V. Karpenko Physico-Mechanical Institute, NAS of Ukraine, 5 Naukova Str., UA-79060 Lviv, Ukraine
$^{2}$Ivan Franko National University of Lviv, 1 Universytets’ka Str., UA-79000 Lviv, Ukraine

Received: 13.08.2019; final version - 31.03.2020. Download: PDF

The corrosion resistance of the amorphous metallic alloys (AMAs) of Fe$_{82}$Nb$_2$B$_{14}$REM$_2$ (REM = Y, Gd, Tb, Dy) in 0.05 M NaCl solution is estimated by cyclic voltammetry. As found, the 2 at.% rare-earth metal (REM) alloying of the alloys promotes corrosion resistance. The surface morphology of the AMAs samples is investigated by scanning electron microscopy method. As shown, a treatment by solution of fluoric acid changes the AMAs surface. As established, the chemical etching by fluoric acid, as well as a fivefold scan of the potential leads to the formation of new protective oxide-hydroxide layers, which cause an increase corrosion resistance. In particular, the content of Y in the surface layers after interaction with the solution of fluoric acid compared to other doped alloys is the highest.

Key words: amorphous metallic alloys, rare-earth metals, corrosion resistance, morphology.

URL: http://mfint.imp.kiev.ua/en/abstract/v42/i07/0977.html

DOI: https://doi.org/10.15407/mfint.42.07.0977

PACS: 61.43.Dq, 68.37.Hk, 68.47.De, 81.65.Cf, 81.65.Kn, 81.65.Rv

Citation: M.-O. M. Danyliak and L. M. Boichyshyn, Corrosion Resistance of Amorphous Alloys Fe$_{82}$Nb$_2$B$_{14}$REM$_2$ (REM = Y, Gd, Tb, Dy) in NaCl Medium, Metallofiz. Noveishie Tekhnol., 42, No. 7: 977—987 (2020) (in Ukrainian)

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