ELECTROCHEMICAL CHARACTERISTICS OF THE AMORPHOUS ALLOY Fe78,5Ni1,0Mo0,5Si6,0B14,0 IN AQUEOUS SOLUTIONS OF SULFURIC ACID WITH DIFFERENT CONCENTRATION
Journal Title: Праці Наукового товариства ім. Шевченка - Year 2018, Vol 53, Issue
Abstract
Electrochemical methods (potentiometry, cyclic voltammetry, electrochemical impedance spectroscopy) used for investigation corrosion resistance of tape amorphous metallic alloy Fe78.5Ni1.0Mo0.5Si6.0B14.0 in 0.05 and 0.5 M aqueous solutions of sulfuric acid. It was established that for both the contact and the external surfaces of the tape, the potential values are shifted to the anode side, the surface is better protected. In the more concentrated sulfuric acid potential values are more positive and the alloy’s surface has higher corrosion resistance. According to the results of the investigation Fe78.5Ni1.0Mo0.5Si6.0B14.0 amorphous alloy by cyclic voltammetry under conditions of forced scanning potential in the interval (–1.5 ÷ 0.5) V with the scanning rate = 50, 20, 10 mV/s, for both the contact and the external surfaces of the tape the value of the corrosion potentials does not change significantly. It can be traced in general the increasing of corrosion resistance of the samples, which causes the displacement of the corrosion potentials to the anode side, however, the values of corrosion currents a little bit increase. Dependences the changes of corrosion potentials from the number of scan cycles, practically, do not differ, but the narrowing of the potential change limits with the speed increasing is observed. Under all conditions, the corrosion potentials move to the anodic side and the corrosion resistance of the alloy increases. An even greater passivation of the Fe78.5Ni1.0Mo0.5Si6.0B14.0 surface is observed during the contact of the sample with an aggressive medium of 0.5 M sulfuric acid. In this case the corrosion potentials is even more shifted to the anodic side and the corrosion currents are reduced in two orders. This indicates the active oxidation of the amorphous surface and the rapid formation of protective oxide layers in a solution with higher concentrations of sulfuric acid.
Authors and Affiliations
Oksana HERTSYK, Myroslava KOVBUZ, Tetiana HULA, Nataliia PANDIAK, Nadiia SENKIV
Keywords
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