Electrochemical synthesis of a biomedically important Co-Cr alloy
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Authors: Hyslop, D.J.S., Abdelkader, A.M., Cox, A. and Fray, D.J.
Journal: Acta Materialia
Co-30 wt.% Cr alloy was prepared by electro-deoxidation in molten calcium chloride at 1123 K. A preliminary study was conducted into the preparation of the mixture of the Co 3 O 4 and Cr 2 O 3 and the formation of the non-stoichiometric, spinel structured, mixed oxide nominally labeled Co x Cr y O 4 . Constant voltage chronoamperometry was used both to prepare the alloy and to investigate its mechanism of formation. Electro-deoxidation proceeds by the simultaneous rapid reduction of CoO to Co and the slower reduction/substitution of Co x Cr y O 4 to CaCr 2 O 4 and Co metal. The final step of the electro-deoxidation is the reduction of CaCr 2 O 4 to Cr metal, which alloys with the Co metal, and release of Ca 2+ back into the electrolyte. © 2010 Acta Materialia Inc.