Corrosion performance of Fe-based amorphous composites with rare earth elements

Abstract:

The Fe-15Mn-5Si-14Cr-0.2C amorphous matrix composite rod sample was prepared from industrial raw materials by the coating agent (CaO-Fe₂O₃-SiO₂), and the rare earth elements Ce, Dy and Ce+Dy were added, and the rare earths were studied by XRD ;the influence of elements on the microstructure; the electrochemical workstation three-electrode system was used to test the corrosion behavior of the sample in 1mol/L HCl and 1mol/L NaOH. The results show that the alloy with rare earth elements is still amorphous composite material (undercooled austenite phase CFe_15.1 + ferrite phase Fe-Cr), and the sample with 1% Ce is resistant to corrosion in HCl and NaOH .The self-corrosion potential in HCl is -0.16205V, the self-corrosion current density is 7.699×108A?cm^_-2, and the polarization resistance reaches 9.5774×108Ω?cm^₂. In NaOH the self-corrosion potential and self-corrosion current density is -0.1839V, 1.7453×10^_-8A?cm^_-2, and the polarization resistance value is 7.1574×10^₈Ω?cm2. The corrosion resistance is much better than 304 stainless steel. It is a corrosion-resistant material with great potential.