Films Containing Nickel and Iron Compounds on Aluminum and Titanium

V. S. Rudnev and V. P. Morozova

Institute of Chemistry, Russian Academy of Science, Far-East Division,
pr. 100-Letiya Vladivostoka 159, Vladivostok, 690022 Russia

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Received March 19, 2007

Abstract — The composition of films formed by plasma electrochemical oxidation–deposition on aluminum and titanium in aqueous solutions containing both Ni(II) and Fe(III) polyphosphate complexes is studied. Elementary compositions of the outer part of the layers on aluminum and titanium differ insubstantially. Concentrations of nickel and iron (up to 30 wt %) in the films vary in proportion to their molar ratio in the electrolyte. Upon annealing in air, simple and multiple metal (M) oxides and phosphates crystallize in the layers, particularly, AlPO₄, NiAl₂O₄, and Fe₂O₃ on aluminum, while Ni₂P₂O₇, Ni_0.5TiOPO₄; NaTi₂(PO₄)₃, M(II)M(III)Ti(PO₄)₃, FePO₄, and Fe₂Fe(P₂O₇) on titanium.