Authors: Lei, J.P.; Huang, H.; Dong, X.L.; Zhu, X.G.; Lu, B.; Lei, M.K.

Source: Journal of Nanoscience and Nanotechnology, Volume 9, Number 12, December 2009 , pp. 7503-7509(7)

Publisher: American Scientific Publishers

Abstract:

Various Mg-based nanoparticles were prepared by evaporating bulk magnesium in the atmospheres of Ar, Ar + N₂ and CH₄, respectively. The formations, phases, morphologies, thermal properties and corrosion behaviors of these kinds of nanocomposite particles were investigated by means of X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), thermogravimetric-differential thermal analysis (TG/DTA) and potentiodynamic polarisation scan (PPS). It is shown that the Mg-based nanoparticles produced in Ar and Ar + N₂ atmospheres have hexangular crystal habits with particles' sizes ranging from 50 to 400 nm, while the nanoparticles produced in CH₄ atmosphere have amorphous carbon out layers with particles' sizes among 20-100 nm. TG/DTA results show that two-steps oxidation process can be confirmed for all samples, which may be attributed to the oxidations of out layer and core of nanoparticle. The CH₄ atmosphere-prepared nanoparticles exhibit better corrosion resistance properties due to its peculiar carbon doping.

Keywords: MG-BASED NANOPARTICLES; MICROSTRUCTURE; OXIDATION; CORROSION

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jnn.2009.1789

Publication date: 2009-12-01

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