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Electrochemically functionalized graphene as an anti-corrosion reinforcement in Cu matrix composite thin films

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International Journal of Minerals,Metallurgy and Materials 2021年第9期28卷 1525-1533页

作者： Akhya kumar Behera Amlan Das Sanjeev Das Archana Mallik electrometallurgy and Corrosion Laboratory(Research) Department of Metallurgical and Materials EngineeringNational Institute of TechnologyRourkela 769008OdishaIndia Advanced Metal Casting Laboratory Department of Metallurgical and Materials EngineeringNational Institute of TechnologyRaipur 492010ChhatisgarhIndia

Cu-graphene(Gr)composite thin films were prepared by electrodeposition route using in-house synthesized Gr *** Gr sheets were synthesized by the electrochemical exfoliation route using 1 M HClO4 acid as *** Gr sheets were confirmed by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),field-emission scanning electron microscopy(FESEM),and transmission electron microscopy(TEM).The(002)plane of Gr sheets was observed at 2θof 25.66°.The(002)plane confirmed the crystal structure of car-bon *** stretching vibration of C=C bond at a wavelength of 1577 cm^(−1) and other functional groups of carboxyl and epoxide groups were observed from *** confirmed the transparent structure of Gr *** prepared Gr sheets were used as reinforcement at con-centrations of 0.1 and 0.3 g/L with a copper matrix to synthesize the Cu-Gr *** prepared composite thin films were characterized by XRD,SEM,and energy-dispersion spectrometry(EDS)for morphological and analytical *** presence of Gr sheets in Cu-Gr com-posite was confirmed by EDS *** prepared Cu-Gr nanocomposite thin film showed higher corrosion resistance compared with pure copper thin films in 3.5wt%NaCl,as confirmed by Tafel *** impedance spectroscopy complimented the above results and showed that 0.3 g/L composite film achieved the highest film resistance.

关键词： graphene nanocomposite electrodeposition copper

Hydrometallurgical application for treating a Nigerian chalcopyrite ore in chloride medium:Part *** kinetics assessment

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International Journal of Minerals,Metallurgy and Materials 2013年第11期20卷 1021-1028页

作者： Alafara A.Baba Kuranga I.Ayinla Folahan A.Adekola Rafiu B.Bale Malay K.Ghosh Abdul G.F.Alabi Abdul R.Sheik Ismael O.Folorunso department of Industrial Chemistry University of IlorinP.M.B.1515 department of Chemistry Institute of Basic and Applied SciencesKwara State PolytechnicP.M.B.1375 department of Geology and Mineral Sciences University of IlorinP.M.B.1515 Hydro & electrometallurgy department Institute of Minerals and Materials Technology department of Materials & Metallurgical Engineering University of IlorinP.M.B.1515

The dissolution kinetics of a Nigerian chalcopyrite ore in hydrochloric acid was studied in this article. Acid concentration, reaction temperature, and ore particle size were chosen as experimental parameters. The chemical and morphological studies of the ore before and after leaching at optimal conditions were carried out by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. It is revealed that increasing the acid concentration and system temperature and decreasing the ore particle size greatly enhances the dissolution rate. The dissolution kinetics was found to follow the shrinking core model for the diffusion control mechanism where the activation energy （Ea） of 32.92 ***1-1 was obtained for the process and supported by morphological changes at a higher dissolution of 91.33%.

关键词： chalcopyrite hydrometallurgy leaching, hydrochloric acid dissolution ore treatment

Electrodeposition of cobalt from aqueous sulphate solutions in the presence of tetra ethyl ammonium bromide

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Transactions of Nonferrous Metals Society of China 2015年第6期25卷 2047-2053页

作者： Pinak PATNAIK Subrat Kumar PADHY Bankim Chandra TRIPATHY Indra Narayan BHATTACHARYA Raja Kishore PARAMGURU CSIR-Institute of Minerals and Materials Technology Hydro and Electrometallurgy Department Academy of Scientific and Innovative Research Training and Development Complex School of Mechanical Engineering KIIT University

The effect of tetra ethyl ammonium bromide （TEAB） as an additive on the structural, morphological characteristics of the cobalt metal produced from aqueous sulphate solutions was investigated. The concentration of TEAB was varied in a range of 1-50 mg/L to evaluate its effect on current efficiency, energy consumption and quality of electrodeposited cobalt metal. Smooth and bright deposits of cobalt were obtained at low concentration of TEAB （10 mg/L） maintaining a current efficiency of 99.6%, with a low energy consumption of 2.38 kW＇h/kg. X-ray diffraction studies reveal that （100） plane is the most preferred plane of crystal growth during cobalt electrodeposition. Scanning electron micrographs indicate that smooth and uniform deposit of cobalt is obtained at 10 mg/L beyond which the deposit quality deteriorates. Cyclic voltammetric studies indicate that the presence of TEAB in the electrolytic bath polarizes the cathode and decreases the cathodic current considerably. XPS results confirm the electrodeposition of high pure cobalt with no sign of chemical bonding with TEAB as evident from the FTIR spectra.

关键词： cobalt tetra ethyl ammonium bromide (TEAB) electrodeposition polarisation study current efficiency deposit morphology

Influence of Oxygen Addition on Structure and Properties of Titanium Produced by Electroslag Remelting

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Materials Sciences and Applications 2016年第3期7卷 139-149页

作者： Olga Snizhko Anatoliy Ryabtsev Alexandr Troyanskyy Vladimir Pashinskii Bernd Friedrich Johannes Morscheiser Marek Bartosinski department of electrometallurgy Donetsk National Technical University Donetsk Ukraine IME Process Metallurgy and Metal Recycling RWTH Aachen University Aachen Germany

The current work is devoted to the investigation of oxygen impact on the structure and properties of titanium. For this purpose, oxygen was introduced into titanium during chamber electro-slag remelting by three different methods: alloying by oxygen-rich residues from the Kroll process to final values between 0.053 wt.-% and 0.40 wt.-%, by reaction with the gas phase to 0.27 wt.-% and by introduction of TiO2 nanoparticles to 0.73 wt.-%. The influence of oxygen on microstructure of titanium during crystallization, heat treatment and deformation is determined as well as the effect of oxygen on the hardness and the mechanical properties of the material in different structural states. Furthermore, control methods of the structure formation process by thermal effects are proposed. Results show that the chamber electroslag remelting allows obtaining a homogeneous structure of the ingot in the investigated range of oxygen content in titanium. The hardness does not vary by more than 10 percent in longitudinal or radial direction in any of the remelted ingots.

关键词： Titanium Oxygen Electroslag Remelting Alloying Heat-Treatment Shear Transformation Recrystallization Deformation Work-Hardening Structure Refinement

Hydrometallurgical Processing of Manganese Ores: A Review

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Journal of Minerals and Materials Characterization and Engineering 2014年第3期2卷 230-247页

作者： Alafara A. Baba Lateef Ibrahim Folahan A. Adekola Rafiu B. Bale Malay K. Ghosh Abdul R. Sheik Sangita R. Pradhan Olushola S. Ayanda Ismail O. Folorunsho department of Chemistry Faculty of Applied Sciences Cape Peninsula University of Technology Cape Town South Africa department of Geology and Mineral Sciences University of Ilorin Ilorin Nigeria department of Industrial Chemistry University of Ilorin Ilorin Nigeria department of Industrial Chemistry University of Ilorin Ilorin Nigeria department of Geology and Mineral Sciences University of Ilorin Ilorin Nigeria Hydro & electrometallurgy department Institute of Minerals and Materials Technology Bhubaneswar India

Hydrometallurgy is the most suitable extractive technique for the extraction and purification of manganese as compared to all other techniques including biometallurgy and pyrometallurgical processes. In the hydrometallurgical processing of manganese from its ore, the leach liquors often contain divalent ions such as iron, manganese, copper, nickel, cobalt and zinc along with other impurities which make manganese very difficult to separate. The processes employed for solution concentration and purification in the hydrometallurgical processing of manganese include precipitation, cementation, solvent extraction and ion exchange. Solvent extraction also proves more efficient and it plays vital roles in the purification and separation of the manganese as compared to all other techniques. A detailed review of the various steps involved in the hydrometal-lurgical manganese processing, concentration and purification processes and newer processes of extraction of manganese from ores and waste materials were discussed.

关键词： Manganese and Manganese Ores Hydrometallurgy Biometallurgy Pyrometallurgy Solvent Extraction