Journal
SURFACE & COATINGS TECHNOLOGY
Volume 258, Issue -, Pages 1090-1099Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2014.07.025
Keywords
Magnesium alloy; Coating; Corrosion; Mechanical properties; Biomaterials
Funding
- Universiti Teknologi Malaysia (UTM) [R.J.130000.7324.4B136]
- Nippon Sheet Glass Foundation [R.J.130000.7324.4B136]
Ask authors/readers for more resources
In this study, nano-silicon (Si) thin films were deposited on biodegradable Mg-6Zn-0.8Mn-3Ca substrates by physical vapor deposition (PVD) method. Subsequently, nano-hydroxyapatite (HA) was coated as a second layer on the nano-Si film using electrochemical deposition (ED). The surface morphology and the corrosion behavior of the composite coatings were evaluated using scanning electron microscope, X-ray diffraction, Fourier-transform infrared spectroscopy, transmission electron microscopy, potentiodynamic polarization tests and immersion tests. The Si/HA nano-composite coating, with an average particle size of 72 nm, represented a uniform and dense film consisting of HA as the outer layer (8-10 mu m) and Si as the inner layer (1.5-2 mu m). However, some micropores and microflaws were observed in the Si thin film. The polarization test indicated that Si/HA coating could efficiently reduce the corrosion rate of Mg alloy in simulated body fluid from 2.57 to 0.12 mm/year. However, only moderate reduction in corrosion rate was observed in the case of single layer nano-Si coating. Hydrogen evolution studies showed greater reduction in degradation rate of Si/HA and Si coated samples, compared to uncoated alloy. Immersion test showed the formation of apatite layer on the surface of Si/HA film after immersion in SBF that resulted in noticeable improvement of bioactivity. (C) 2014 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available