Oxidative Degradation of Atomized Iron Controlled By the Nanostructured Environment
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Oxidative Degradation of Atomized Iron Controlled By the Nanostructured Environment Naveen Rawat1, Russel Gudyaka2, Kumar Mohit1, and Kalathur S.V. Santhanam3,4 1 Center For Materials Science and Engineering, Rochester Institute of Technology, Rochester, NY, 14623 2 Delphi, Rochester, NY, 14623 3 Center For Materials Science and Engineering, Rochester Institute of Technology, Lomb Memorial Drive, Rochester, NY, 14623 4 Department of Chemistry, Rochester Institute of Technology, Lomb Memorial Drive, Rochester, NY, 14623 Abstract A large number of composited materials of atomized iron and multiwalled carbon nanotubes have been prepared and sintered at 850oC for one hour. The sintered samples were examined for thermal and for electrochemical corrosion of atomized iron. The results suggest that the composited materials are free from oxidative degradation. The absence of oxidation of atomized iron in nanocomposited environment is attributed to the configurational geometry and spintronics type interaction proposed in recent theoretical calculations. Key words: Atomized iron, multiwalled carbon nanotubes, corrosion rates, spintroncs INTRODUCTION The interaction of atomized iron with multiwalled carbon nanotubes (MWCNT) has been of interest in the light of several theoretical studies and possible applications in structural materials. The theoretical treatments (1-5), visualize two types of interactions-one where atomized iron is situated on the outer surface of the nanotubes and another inside the nanotube. The chemical reactivity of atomized iron in the above two cases would be dependent on the configurational geometry and accessibility of the reactants. Iron undergoes high temperature thermal oxidation to form iron oxide in the presence of oxygen Our previous studies (6) on thermo gravimetric analysis of atomized iron and multiwalled carbon nanotubes demonstrated stabilization of atomized iron. In the present work, we have studied the corrosion property of the samples. The results suggest that atomized iron is free from high temperature corrosion in a nanostructured environment. EXPERIMENTAL DETAILS Chemicals: Atomized iron (Hoeganaes-D300gbt #0025600019) has been used in this work. Multiwalled carbon nanotubes (MWCNT) (Helix Material Solutions, Texas or Deal international, Rochester) (diameter ranging from 60-100 nm and length 0.5-40 µm) of high purity was used. Compositions: The following samples were prepared where the weights of iron and MWCNTs
are listed in Table 1. The samples were compacted at 850OC for one hour under inert atmosphere before use. CORROSION STUDIES: Weight gain method: The sintered samples of different compositions were kept in the furnace tube with oxygen gas flowing through it. A ceramic boat containing the sintered sample is kept in the furnace tube and the temperature is increased to 600oC. The sample is kept for 24 hours at this temperature with the oxygen gas flowing through the tube. The sample is cooled to room temperature and the ceramic boat is weighed.
Table 1: Compositio
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