Anti-corrosion performance of the mild steel substrate treated by a novel nanostructure europium oxide-based conversion coating: Electrochemical and surface studies

摘要

In the current study, the steel surface was chemically treated by a novel nanostructured film based on europium oxide (Eu2O3) through optimizing the film formation parameters, i.e., pH and temperature. The results obtained from the field emission scanning electron microscope (FE-SEM) and atomic force microscope (AFM) demonstrated that the steel surface was covered by a uniform europium oxide film. The grazing incidence X-ray diffraction (GIXRD) patterns proved the presence of europium oxide compounds on the metal surface. According to the electrochemical impedance spectroscopy (EIS) results, the surface-treated sample showed a corrosion resistance of approximately 3000 Omega.cm(2) in the 3.5 % NaCl solution. The potentiodynamic polarization test results evidenced that through the deposition of the europium oxide film, the corrosion current density (icorr) significantly decreased.