Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1998-08-03
2000-07-11
Bell, Bruce F.
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
204293, 420563, 420564, 420565, 420566, 420570, 429226, C22F 112
Patent
active
060866918
ABSTRACT:
Lead and lead-alloy anodes for electrowinning metals such as zinc, copper, lead, tin, nickel and manganese from sulfuric acid solutions, whereby the electrodes are processed by a repetitive sequence of cold deformation and recrystallization heat treatment, within specified limits of deformation, temperature and annealing time, to achieve an improved microstructure consisting of a high frequency of special low .SIGMA. CSL grain boundaries (i.e.>50%). The resultant electrodes possess significantly improved resistance to intergranular corrosion, and yield (1) extended service life, (2) the potential for reduction in electrode thickness with a commensurate increase in the number of electrodes per electrowinning cell, and (3) the opportunity to extract higher purity metal product.
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E.M. Lehockey, et al., Mat. Res. Soc. Symp. Proc. vol. 458 1997 Materials Research Society, pp. 243-248, "Grain Boundary Engineered Lead Alloys".
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R. David Prengaman, "Wrought Lead-Calcium-Tin Anodes for Electrowinning" in Anodes for Electrowinning: Proceedings of the Sessions, 1984, pp. 59-67.
R. David Prengaman, "New Insoluble Lead Anodes for Copper Electrowinning", Proceedings of the Electro refining and Winning of Copper Conference, 1987, pp. 457-467.
Lehockey Edward M.
Limoges David L.
Lin Peter Keng-Yu
Palumbo Gino
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