Oxide
Phosphate Layers with Zirconium Compounds on Titanium
V. S. Rudnev, K. N. Kilin, P. M. Nedozorov, A. Yu. Ustinov, T. P. Yarovaya, and T. A. Kaidalova
Institute of Chemistry, Far East Division, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159,
Vladivostok, 690022 Russia
Received August 11, 2006
Abstract — Layers of titanium and zirconium oxides and phosphates can be formed on the titanium surface in the aqueous baths containing polyphosphates and Zr(SO4)2 · 4H2O by the plasma-electrolytic method. The elemental and phase composition and the thickness of films, as well as the mechanism of their formation, depend on the molar ratio n = [polyphosphate]/[Zr4+] in the bath. A multilayer mechanism of the film growth is described. Layers containing crystalline ZrO2 or ZrP2O7 are obtained. Their annealing in air at 800
results in the crystallization and the formation of certain phosphates depending, e. g., on the ratio n in the bath, TiP2O7, Ti0.8Zr0.2P2
7, NaZr2(PO4)3 are formed. According to the ESCA data, the films contain carbon in low oxidation degrees. In deep layers, the presence of titanium and phosphorus in the oxidation degrees lower than +4 and +5, respectively, is observed.
results in the crystallization and the formation of certain phosphates depending, e. g., on the ratio n in the bath, TiP2O7, Ti0.8Zr0.2P27, NaZr2(PO4)3 are formed. According to the ESCA data, the films contain carbon in low oxidation degrees. In deep layers, the presence of titanium and phosphorus in the oxidation degrees lower than +4 and +5, respectively, is observed.
PACS numbers: 82.45.Cc, 81.15.Pq
DOI: 10.1134/S0033173207060045