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Formation of barrier-type anodic films on ZE41 magnesium alloy in a fluoride/glycerol electrolyte

AuthorsHernández-López, J. M.; Ně mcová, A.; Zhong, X.L.; Liu, H.; Arenas, M. A.; Haigh, S.J.; Burke, M.G.; Skeldon, P.; Thompson, G.E.
Anodic oxidation
Issue Date2014
CitationElectrochimica Acta 138: 124-131 (2014)
AbstractBarrier-type, nanocrystalline anodic films have been formed on a ZE41 magnesium alloy under a constant current density of 5 mA cm-2 in a glycerol/fluoride electrolyte, containing 5 vol.% of added water, at 293 K. The films contain magnesium, fluorine and oxygen as the major species, and lower amounts of alloying element species. The films grow at an efficiency of ∼0.8 to 0.9, with a formation ratio in the range of ∼1.2 to 1.4 nm V -1 at the matrix regions and with a ratio of ∼1.8 nm V -1 at Mg-Zn-RE second phase. At the former regions, rare earth species are enriched at the film surface and zinc is enriched in the alloy. A carbon- and oxygen-rich band within the film suggests that the films grow at the metal/film and film/electrolyte interfaces. © 2014 The Authors. Published by Elsevier Ltd.
Identifiersdoi: 10.1016/j.electacta.2014.05.147
issn: 0013-4686
Appears in Collections:(CENIM) Artículos
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