Influence of Gd, Dy and Fe doping on electrochemical properties of Al87Y5Ni8 amorphous metallic alloy

Corrosive properties of some Al-based amorphous metallic alloys (AMA) and the relationship between the AMA composition and nature of protective layers on the surface of alloys were studied. The complex of physico-chemical methods, namely the potentiometry, voltammetry, electrochemical impedance spectroscopy and electronic microscopy, has been used. It was shown that the influence of Dy doping on the same characteristics of alloys is opposite to that of Gd. It increases corrosion resistance of Dy-containing alloys in comparison to the reference Al87Y5Ni8 alloy. Partial substitution of 4 at. % Ni by Fe causes further increase of corrosion resistance of Al87Gd5Ni4Fe4.