Characterization and corrosion behavior of Al–Co–rare earth (Ce–La) amorphous alloy

A new Al-based amorphous alloy with excellent corrosion resistance and high thermal stability was produced in the Al–Co–RE (Ce–La) system. In this regard, two different amorphous-nanocrystalline ribbons: Al_87.6–Co_6.4–Ce_3.8–La_2.2 (M₁) and Al_82.3–Co_10.1–Ce_4.8–La_2.8 (M₂) were prepared using melt spinning. The results reveal the supercooled liquid region (ΔT_x) of 218 °C which shows that the M₂ alloy has higher thermal stability in comparison to the M₁ alloy. The M₂ ribbons present the superior corrosion resistance because of the formation of amorphous phase. The i_corr, E_corr, E_pit, and E_pit – E_corr values of fully amorphous Al–Co–Ce–La metallic ribbons have a better trend of anti-corrosion performance compared to other crystalline and amorphous aluminum alloys.