ELECTROCHEMICAL PARAMETERS OF A MODIFIED AMORPHOUS ALLOY IN AQUEOUS SOLUTIONS OF DIFFERENT NATURES

Amorphous metal alloys (AMА) have high corrosion resistance, which can be significantly higher than that of stainless steels. Since ferromagnetic amorphous Fe-based alloys are widely used as soft magnetic materials, their operation is associated with the use of external magnetic fields. Such external influences can change, in particular, the corrosion resistance of amorphous materials. In addition to permanent, amorphous materials can be under the influence of variable magnetic fields. Preliminary exposure in magnetic fields, in particular, alternating ones, can be used to modify AMА. In this regard, electrochemical studies of AMА Fe80Si6B14 in various aggressive environments are appropriate. The search for optimal modes of modification to achieve the given physicochemical properties of the samples makes it possible to change their corrosion resistance. The features of the corrosion resistance of the ribbon amorphous alloy Fe80Si6B14, obtained by the method of ultra-fast cooling of the melt, were studied, for which the contact and external surfaces, which have different elemental composition and properties, are distinguished. Electrochemical studies of AMА electrodes in 0.5 M aqueous solutions of NaCl, НCl and NaОН were carried out by the method of chronopotentiometry and cyclic voltammetry using the Jaissle Potentiostat-Halvanostat IPM 88 PC-R potentiostat. The modification of samples of Fe80Si6B14 strip amorphous alloy was carried out by keeping them in an alternating magnetic field (frequency 50 Hz) for 0.5–3.0 hours. The corrosion resistance of the Fe80Si6B14 strip amorphous alloy modified by an alternating magnetic field in 0.5 M aqueous solutions of NaCl, NaOH and HCl was investigated by various electrochemical methods. It is shown that the corrosion resistance of the tape significantly depends on the duration of the modification and the nature of the aggressive environment. Higher corrosion resistance of Fe80Si6B14 samples modified by a variable magnetic field in 0.5 M aqueous HCl solution was established. The ribbon amorphous Fe80Si6B14 alloy shows exceptional durability to long-term modification in an alternating magnetic field with the subsequent stay of the samples in 0.5 M aqueous solutions of NaOH and HCl.