Yb-fiber laser beam was used successfully to irradiate Al-1.5wt.% Fe alloy, modifying its surface to improve its corrosion resistance for aerospace applications. Laser-treated samples were examined by optical microscopy, scanning electron microscopy, energy dispersive X-ray diffraction (EDX), and low-angle X-ray diffraction (LA-XRD), and tested by Vickers microhardness. The alloy's corrosion resistance was tested by exposure to H 2SO 4 solution, Tafel plots, polarization, and corrosion potentials. The results reveal the formation of weld filet structures with metastable phases and finely dispersed precipitates. The creation of a finely porous layer of protective coating produced during the rapid remelting process contributed to increase the corrosion resistance of laser-treated samples when compared with untreated samples. The Yb-fiber laser beam technology applied to the surface treatment of aluminum alloys proved efficient in augmenting their corrosion resistance, thus deserving further investigation for aerospace and automotive applications. © 2011.
Pariona, M. M., Teleginski, V., Santos, K. dos, Machado, S., Zara, A. J., Zurba, N. K., & Riva, R. (2012). Yb-fiber laser beam effects on the surface modification of Al-Fe aerospace alloy obtaining weld filet structures, low fine porosity and corrosion resistance. Surface and Coatings Technology, 206(8–9), 2293–2301. https://doi.org/10.1016/j.surfcoat.2011.10.007