TITLE:
The Alumina Film Nanomorphology Formed to Improve the Corrosion Resistance of Al-2.0 wt% Fe Alloy as Result of the Laser Surface Melting Technique Applied
AUTHORS:
Moises Meza Pariona, Katieli Tives Micene
KEYWORDS:
Al-2.0 wt% Fe Alloy, Laser-Treated, Microstructure, Low-Angle X-Ray Diffraction, Cyclical Polarization
JOURNAL NAME:
Advances in Chemical Engineering and Science,
Vol.7 No.1,
December
21,
2016
ABSTRACT: The
laser surface remelting (LSR) treatment was performed to Al-2.0 wt% Fe
alloy with a 2 kW Yb-fiber laser (IPG YLR-2000S). The substrate and
laser-treated material characterization were executed using different techniques. Among them, the microstructure was analyzed by optical microscope, SEM, low-angle
X-ray diffraction (LAXRD) and the corrosion test was made in aerated solution
of 0.1 M H2SO4 at a temperature of 25°C ± 0.5°C. As
result was shown, the
micrograph of LSR-treated material displaying can be a fine cellular structure and the existence of
certain nano-porosities
and a similar to a nano-dendritic growth was observed too. The characteristic
of melted zone was constituted of metastable phases according to the result of
x-rays and the behavior corrosion as a result of the LSR-treated sample, which it was shown to be more resistant to corrosion than the untreated sample. A comparative
study was carried out of the cyclic polarization of the laser-treated and
untreated samples, demonstrating that the reduction and oxidation reverse peaks
were not observed and being the cyclic polarization behavior was of irreversible character in both samples,
however, the LSR-treated sample propitious the passivity on the surface also reduced the corrosion phenomena. Wherefore, this type of
laser-treated alloy can be applied in the aerospace, aeronautic and
automobilist industries.