Abstract
Electrochemical techniques were used to investigate different factors such as concentration, immersion time, and temperature on the corrosion behavior of the metal-metal glassy Fe(78)Co(9)Cr(10)Mo(2)A(l1) (VX9) and Fe49Co49V2 (VX50) (at.%) alloys in sulfuric acid (H2SO4). The passive film on the surface of the alloys at different H2SO4 concentrations was analyzed by X-ray photoelectron spectroscopy, and examined by scanning electron microscope and atomic force microscopy. The electrochemical measurements illustrate that the VX9 alloy has a lower corrosion resistivity than the VX50 alloy in all measured effects in this study, due to the n-type semiconductor passive layer (FeOOH, Fe3O4, and Fe2O3) that forms on this alloy. This occurred even though these alloys demonstrated a high degree of resistance at higher concentrations (12.0M) of H2SO4 solution. A decrease in the corrosion resistance and an increase in the corrosion rate was observed with the incremental increase of immersion time and temperature. The thermodynamic parameters, such as Ea, S* and H*, were evaluated for the corrosion process and discussed in terms of a 3.0M H2SO4 solution.