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Corrosion behavior of Ce-doped Ni-10Cu-11Fe-6Al(wt%) inert anode in molten CaCl_2 salt

Journal of Rare Earths 2019年第2期37卷 218-224页

作者： mehdi alzamani Kourosh Jafarzadeh Arash Fattah-alhosseini Malek Ashtar University of Technology Department of Materials Engineering Bu-Ali Sina University

In this research the effect of cerium dopingon corrosion behavior of Ni-10 Cu-11 Fe-6 Al(wt%) alloy as a novel inert anode in titanium electrolytic production was investigated. The samples, including un-doped and Ce-doped nickel-based alloys, were prepared using vacuum induction melting(VIM) process and then exposed to the electrolysis in molten calcium chloride at 900C at à1.6 V versus graphite reference electrode for different immersion time. The surface and cross-section of the samples were characterized using scanning electron microscopy(SEM), and their electrochemical behavior was investigated by electrochemical impedance spectroscopy(EIS). The results show that the un-doped samples have greater number of voids and porosities as compared to that of the 0.0064 wt% Ce-doped samples(as the optimum content of cerium in the alloy). Thus, the nickel-based alloy becomes less sensitive to the pitting by addition of cerium. The corrosion penetration depth reaches about 244 mm after 16 h of electrolysis in the un-doped sample, while was approximately 103 mm for the 0.0064 wt% Ce-doped sample, which is an indication that the corrosion penetration depth decreases by adding small amounts of Ce.

关键词： Ni-10Cu-11Fe-6Al Ce doping Corrosion behavior Molten CaCl2 salt Nickel-based alloy Rare earths

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Influence of catalyst on structural and morphological properties of TiO2 nanostructured films prepared by sol-gel on glass

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Progress in Natural Science:Materials International 2013年第1期23卷 77-84页

作者： mehdi alzamani Ali Shokuhfar Ebrahim Eghdam Sadegh Mastali Mechanical Department Advanced Materials and Nanotechnology Research LabK.N.Toosi University of Technology Faculty of Metallurgical and Materials Engineering Semnan University

Transparent TiO2 thin films have been prepared by the sol-gel method using titanium alkoxides as *** films were deposited on glass supports by the dip-coating *** TiO2 layer acts as a self-cleaning coating generated from its photocatalysis and photoinduced *** crystalline structure of TiO2 films was dominantly identified as the anatase phase,consisted of uniform spherical particles of about 14-50 nm in size,which strongly depends upon catalyst-type and heat treatment *** heat treating temperature can lead to an increase in crystalline *** results indicated that the sample S.S(sample derived from sol containing sulfuric acid as catalyst) exhibits superhydrophilic nature and better photocatalytic activity,which can be attributed to its higher anatase content and lower crystalline *** studies,carried out using Atomic Force Microscopy(AFM),confirm the presence of crystalline phase with such a grain size and low surface ***,the applied films exhibiting high photocatalytic activity,superhydrophilic behavior,and low surface roughness can be used as an efficient self-cleaning coating on glass and other optical applications.

关键词： TiO2 films Structural properties Superhydrophilicity Glass substrate

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