CORROSION RESISTANCE OF THERMOMODIFIED AMORPHOUS ALLOY Al87Y4Gd1Ni8 IN THE TEMPERATURE RANGE 624-643 К

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In this work, the changes in the chemical composition of the surface of the amorphous metal alloy Al87Y4Gd1Ni8 as a result of isothermal annealing for two minutes in the air atmosphere at temperatures T1 = 624±2, T2 = 633±2, T3 = 643±2 K, respectively, were studied by scanning electron microscopy. The annealing temperatures were determined from DSC (β=20 K/min) curves. The open circuit potentials were determined by the OCP method, which for this alloy are –0,618, –0,650, and –0,717 V, respectively. The following electrochemical parameters were determined by electrochemical impedance spectroscopy: the electrical equivalent elements used in the models are solution resistance (R1), charge transfer resistance (R3) and corrosion capacitor of the medium/corrosion products interface (CPEdl), charge transfer resistance (R3) in 0,3% aqueous NaCl solution. It was found that with increasing annealing temperature, the values of solution resistance (R1), passive film resistance (R2), and charge transfer resistance (R3), increase, indicating the formation of protective oxide layers on the surface of the alloys. The influence of short-term annealing for 2 min in the temperature range of 624–643 K, which corresponds to the third stage of crystallisation, on the change in the electrochemical properties of the amorphous strip alloy Al87Y4Gd1Ni8 was investigated and the chemical composition of the amorphous metal alloys surface was found to change.

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