[SIS7] Powder Design for Industrial Application

[16C-SIS7-02] Anodization of Ti-Ni Alloy Pallets Formed by Powder Metallurgy

N. Alias¹, T. Wei¹, N. Mirzakhani¹, Z. Hussain¹, W. Tan², G. Kawamura³, A. Matsuda³, *Z. Lockman¹ (1.Green Electronics Oxide nanoMaterials Group (GEM), School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, Malaysia, 2.Institute of Liberal Arts and Sciences, Toyohashi University of Technology, Japan, 3.Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Japan)

Keywords:Ti-Ni alloy, powder metallurgy, anodization, nanotube, Cr(VI) removal

In this work, pellets of Ti-Ni alloys were fabricated by powder metallurgy technique. The powders were mixed with varying Ni composition then compacted and sintered. Under an optimised condition the resulting pellets were rather dense. The pellets were then polished then anodized for anodic film formation. The growth of the anodic film was studied as a function of the alloying composition, phases and crystallinity. In an electrolyte comprising of fluoride ions, the anodic film on diluted Ti-Ni alloys, appeared to have nanotubular structure with nanotubes diameter ranges from 80-100 nm. The nanotubes were mostly titanium dioxide with nickel presence as defects (as dopants). The doped titanium dioxide film was then tested for its photocatalytic properties whereby under light illumination it was found to be able to reduce chromium(VI) to chromium(III) totally. Chromium(VI) removal from contaminated wastewater by this technique is simple and thus is seen to have important industrial application especially for water treatment purposes.