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RISS 인기검색어
- 검색키워드
- 저자 : Zakiyuddin, Ahmad (검색결과 2 건)
- 무료
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- 유료
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Corrosion Behavior of As-Cast and Hot Rolled Pure Magnesium in Simulated Physiological Media
Ahmad Zakiyuddin,Kwi-Dug Yun,Kwangmin Lee 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.6
Magnesium is a biodegradable metal that has significant potential advantages as an implant material. However,the fast degradation rate in the biological environment has limits the application. In this article, corrosionbehaviors of as-cast and hot rolled pure magnesium in 0.9% NaCl, Ringer’s, and Tas-SBF solutionswere studied. Potentiodynamic polarization and hydrogen evolution test were employed to assess the corrosionbehaviors. The magnesium specimens were characterized using field emission scanning electron microscopyequipped with energy-dispersive X-ray analysis and X-ray diffraction. The as-cast specimens in 0.9%NaCl and Ringer’s solutions had lower corrosion potentials and corrosion rates than the hot rolled specimens. However, the as-cast specimen in the Tas-SBF solution had a higher corrosion potential and a lowercorrosion rate than the hot rolled specimen. Only the specimens in the Tas-SBF solution showed passivationbehavior due to the presence of ions. The hot rolled specimen could form apatite more easily on its surfacethan the as-cast specimen in Tas-SBF.
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Electrochemical Properties of HA Coated Titanium Dioxide Nanotubes
Kang, Kyungho,Zakiyuddin, Ahmad,Lee, Kwangmin American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.2
<P>CP Grade II titanium was first anodized in order to form TiO2 nanotubes, and then the TiO2 nanotubes were coated with hydroxyapatite using the sol-gel method. The electrochemical properties of pure Ti, anodized TiO2 nanotubes, and HA-coated TiO2 nanotubes were investigated using potentiodynamic polarization and impedance tests. The sol-gel-coated HA nanoparticles were observed to sufficiently penetrate into the TiO2 nanotubes, and the polarization resistance of the HA-coated titanium nanotubes was higher than that of those that had just been anodized. In conclusion, the HA coating on the TiO2 nanotubes provides improved electrochemical properties and can be effective in overcoming the negative influence of passive TiO2 films.</P>
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