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Title: Electro-deoxidative synthesis of cobalt-based alloys
Author: Hyslop, D. J. S.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2009
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The aims of this study are: to prove the possibility that cobalt-based alloys can be produced with the addition of several alloying elements, such as chromium, molybdenum, nickel and tungsten; and to gain an understanding of the mechanism of electro-deoxidation. This study reports, for the first time, the successful production of metallic Co, Co-30Cr, Co-30Cr-7Mo, Co-27Cr-10Ni and Co-27Cr-12.5W. Preparatory work was conducted to construct some of the electrochemical equipment used and to determine reduction conditions. Mechanistic studies were performed through the use of constant voltage, and constant potential, chronoamperometry; as well as cyclic voltammetry. Fully and partially reduced samples were analysed using a variety of techniques, which included XRD, SEM, Electra oxygen analysis, and optical microscopy. This work also introduces constant current chronopotentiometry as a new technique to FFC investigations. This technique is used, for the first time, to determine mechanistic information about the electro-deoxidation of single and multiple oxide precursors. Electro-deoxidations are completed at a variety of constant currents and the resulting data is used to construct a novel type of Tafel plot.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available