Abstract
A developed criterion of the energy efficiency of iron-boron-silicon, i.e., high entropy, metallic glasses was implemented in
hydrochloric acid solutions. The criterion; lim (the conductivity of the metallic glass in aqueous solution to the conductivity
of the metallic glass in air) =1 was applied to determine the energy efficiency of the metallic glass in the aqueous solution
when the conductivity of a metallic glass in air became equal (decreased) to the steady conductivity of the metallic glass in
aqueous solution as a function of time of the exposure of the metallic glass to the aqueous solution. This criterion was used
to determine the energy efficiency of metallic glasses with a wide range of hydrochloric acid concentration. The values of
the conductivities were determined by the electrochemical impedance spectroscopy (EIS). In addition, the criterion can be
applied under diverse test conditions with a predetermined period of the operational life of the metallic glasses as functional
materials. Furthermore, variations of the energy efficiency of the metallic glasses as a function of the acid concentration and
time were produced by fitting the experimental data to a numerical model using a nonlinear regression method. The profiles
of the metallic glasses exhibit a less conservative behavior of energy efficiency than the applied analytical criterion.
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