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Abstract
The method of differential scanning calorimetry (DSC) has established the temperature of phase transitions of amorphous metal alloys (AMS) of the Al–Ni–RE system (RE = Y, Dy). The processes of PES formation on the AMS/aqueous solution of 0.3% NaCl and the effect of REM content on the corrosion resistance of the investigated samples were studied. The electrochemical characteristics of corrosion of AMC before and after annealing in the range of scan potential ± 50 mV in 0.3 % solution of NaCl were established. It is shown that the partial replacement of Y on Dy in the AMC leads to the increase of corrosion resistance, reduction of the quantity of metal ions in the electrode layer, indicating the lowest value of the density of currents of corrosion, which constitute 9,9 · 10 a A/cm 2 , and correspondingly the value The rate of corrosion, which constitute 1.4 · 10 -8 mm/year. As a result of the annealing at the temperature of nanocrystalization there is a shift of the potential of corrosion in the anode side, which indicates the thermodynamic stability of the surface to oxidation due to the formed by the outflow of oxide-hydroxyl layers. Annealing at temperature nanocrystalization (T 3 ) leads to stabilization of the EK for all investigated alloys, respectively I corr acquires values 10 -8 —10 -10 A/cm 2 . Polarization resistance for nanostructured samples of Al 87 Dy 5 Ni 8 is the highest, because on the edge of the electrode/solution the anode processes are dominated, which cause the formation of dense oxide layers. Annealing at T 2 and T 3 leads to the fact that the amorphous matrix to the formation of intermetallic compounds causes the shift potential of corrosion in the cathode side and there is a growth of currents of corrosion, respectively resistance on the boundary of the electrode/mortar falls sharply. Keywords: amorphous metallic alloys, rare earth metals, thermal annealing, passivation layers, corrosion resistance.
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