Corrosion behaviors of plasma electrolytic oxidation (PEO) treated highsilicon aluminum alloys
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Ceramic oxide layers successfully were formed on the surface of cast Al alloys with high Si contentsusing plasma electrolytic oxidation (PEO) process in electrolytes containing Na2SiO3, NaOH, andadditives. The microstructure of the oxide layers was systematically analyzed using scanning electronmicroscopy (SEM), cross-sectional transmission electron microscopy (TEM), X-ray diffraction patterns(XRD), and energy X-ray dispersive spectroscopy (EDS). XRD analysis indicated that the PEO untreatedhigh-silicon Al alloys (i.e., 17.1 and 11.7 wt.% Si) consist of Al, Si and Al2Cu phases whereas Al2Cu phaseselectively disappeared after PEO treatment. PEO process yielded an amorphous oxide layer with fewsecond phases including γ-Al2O3 and Fe-rich phases. The corrosion behaviors of high-silicon Al alloystreated by PEO process were investigated using electrochemical impedance spectroscopy (EIS) andother electrochemical techniques (i.e., open circuit potential and polarization curve). Electroanalyticalstudies indicated that high-silicon Al alloys treated by PEO process have greater corrosion resistancethan high-silicon alloys untreated by PEO process.
Abstract
Ceramic oxide layers successfully were formed on the surface of cast Al alloys with high Si contentsusing plasma electrolytic oxidation (PEO) process in electrolytes containing Na2SiO3, NaOH, andadditives. The microstructure of the oxide layers was systematically analyzed using scanning electronmicroscopy (SEM), cross-sectional transmission electron microscopy (TEM), X-ray diffraction patterns(XRD), and energy X-ray dispersive spectroscopy (EDS). XRD analysis indicated that the PEO untreatedhigh-silicon Al alloys (i.e., 17.1 and 11.7 wt.% Si) consist of Al, Si and Al2Cu phases whereas Al2Cu phaseselectively disappeared after PEO treatment. PEO process yielded an amorphous oxide layer with fewsecond phases including γ-Al2O3 and Fe-rich phases. The corrosion behaviors of high-silicon Al alloystreated by PEO process were investigated using electrochemical impedance spectroscopy (EIS) andother electrochemical techniques (i.e., open circuit potential and polarization curve). Electroanalyticalstudies indicated that high-silicon Al alloys treated by PEO process have greater corrosion resistancethan high-silicon alloys untreated by PEO process.
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