Laser surface alloying of an electroless Ni–P coating with Al-356 substrate

Laser surface alloying of an electroless plating Ni–P coatings on an Al-356 aluminium alloy was carried out using a 1-kW pulsed Nd:YAG laser. The microstructure, chemical composition and phase identification of the alloyed layer were determined using scanning electron microscopy (SEM), energy-disper...

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Bibliographic Details
Published in:Optics and lasers in engineering 2008-07, Vol.46 (7), p.550-557
Main Authors: Gordani, Gholam Reza, ShojaRazavi, Reza, Hashemi, Sayed Hamid, Isfahani, Ali Reza Nasr
Format: Article
Language:English
Subjects:
Biological and medical applications
Cross-disciplinary physics: materials science
rheology
Electroless Ni–P coating
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Industrial applications
Laser surface alloying
Materials science
Optics
Physics
Pitting corrosion
Surface treatments
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Summary:Laser surface alloying of an electroless plating Ni–P coatings on an Al-356 aluminium alloy was carried out using a 1-kW pulsed Nd:YAG laser. The microstructure, chemical composition and phase identification of the alloyed layer were determined using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray diffractometry (XRD), respectively. It was shown that laser surface treatment produced a relatively smooth, crack-free and hard surface layer. The hardness of the surface significantly increased due to the formation of the uniformly distributed fine Ni–Al intermetallic phases. The corrosion behaviour of the surface alloyed specimens in 3.5% NaCl solution at 23 °C was also determined by electrochemical techniques. The laser-alloyed surface showed an improved corrosion and pitting potential compared to the substrate as well as the plated Ni–P coating.
ISSN:0143-8166
1873-0302
DOI:10.1016/j.optlaseng.2008.02.002