Fabrication and corrosion behavior of Si/HA nano-composite coatings on biodegradable Mg-Zn-Mn-Ca alloy
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...
Saved in:
Main Authors: | , , , , |
---|---|
Format: | Article |
Published: |
Elsevier B.V.
2014
|
Subjects: | |
Online Access: | http://eprints.utm.my/id/eprint/52843/ http://dx.doi.org/10.1016/j.surfcoat.2014.07.025 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
id |
my.utm.52843 |
---|---|
record_format |
eprints |
spelling |
my.utm.528432018-07-04T11:52:20Z http://eprints.utm.my/id/eprint/52843/ Fabrication and corrosion behavior of Si/HA nano-composite coatings on biodegradable Mg-Zn-Mn-Ca alloy Bakhsheshi-Rad, Hamid Reza Hamzah, Esah Daroonparvar, M. Mat Yajid, M. Azizi Medraj, Mamoun TJ Mechanical engineering and machinery 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. μm) and Si as the inner layer (1.5-2. μm). 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. Elsevier B.V. 2014 Article PeerReviewed Bakhsheshi-Rad, Hamid Reza and Hamzah, Esah and Daroonparvar, M. and Mat Yajid, M. Azizi and Medraj, Mamoun (2014) Fabrication and corrosion behavior of Si/HA nano-composite coatings on biodegradable Mg-Zn-Mn-Ca alloy. Surface & Coatings Technology, 258 . pp. 1090-1099. ISSN 0257-8972 http://dx.doi.org/10.1016/j.surfcoat.2014.07.025 DOI: 10.1016/j.surfcoat.2014.07.025 |
institution |
Universiti Teknologi Malaysia |
building |
UTM Library |
collection |
Institutional Repository |
continent |
Asia |
country |
Malaysia |
content_provider |
Universiti Teknologi Malaysia |
content_source |
UTM Institutional Repository |
url_provider |
http://eprints.utm.my/ |
topic |
TJ Mechanical engineering and machinery |
spellingShingle |
TJ Mechanical engineering and machinery Bakhsheshi-Rad, Hamid Reza Hamzah, Esah Daroonparvar, M. Mat Yajid, M. Azizi Medraj, Mamoun Fabrication and corrosion behavior of Si/HA nano-composite coatings on biodegradable Mg-Zn-Mn-Ca alloy |
description |
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. μm) and Si as the inner layer (1.5-2. μm). 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. |
format |
Article |
author |
Bakhsheshi-Rad, Hamid Reza Hamzah, Esah Daroonparvar, M. Mat Yajid, M. Azizi Medraj, Mamoun |
author_facet |
Bakhsheshi-Rad, Hamid Reza Hamzah, Esah Daroonparvar, M. Mat Yajid, M. Azizi Medraj, Mamoun |
author_sort |
Bakhsheshi-Rad, Hamid Reza |
title |
Fabrication and corrosion behavior of Si/HA nano-composite coatings on biodegradable Mg-Zn-Mn-Ca alloy |
title_short |
Fabrication and corrosion behavior of Si/HA nano-composite coatings on biodegradable Mg-Zn-Mn-Ca alloy |
title_full |
Fabrication and corrosion behavior of Si/HA nano-composite coatings on biodegradable Mg-Zn-Mn-Ca alloy |
title_fullStr |
Fabrication and corrosion behavior of Si/HA nano-composite coatings on biodegradable Mg-Zn-Mn-Ca alloy |
title_full_unstemmed |
Fabrication and corrosion behavior of Si/HA nano-composite coatings on biodegradable Mg-Zn-Mn-Ca alloy |
title_sort |
fabrication and corrosion behavior of si/ha nano-composite coatings on biodegradable mg-zn-mn-ca alloy |
publisher |
Elsevier B.V. |
publishDate |
2014 |
url |
http://eprints.utm.my/id/eprint/52843/ http://dx.doi.org/10.1016/j.surfcoat.2014.07.025 |
_version_ |
1643653276257746944 |
score |
13.160551 |