Features of Wetting with Water of Anodic Plasma
Electrochemical Coatings on Aluminum and Titanium
V. S. Rudnev, A. E. Lysenko, and A. Yu. Ustinov
Institute of Chemistry, Far East Division, Russian Academy of Sciences,
pr. Stoletiya Vladivostoka 159, Vladivostok, 690022 Russia
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Received February 4, 2008
Abstract — Wetting with distilled water of coatings formed in orthophosphate–borate aqueous electrolyte is investigated. For an aluminum alloy, the wetting angle of freshly prepared films with water is ~20°. After annealing in air at temperatures higher than 300°C, the films become hydrophilic and water spreads over their surface. With time of storage in air and after sequential operations of wetting in water–drying in air, the wetting angle increases, reaching the values of ~70–80°. The composition of the film bulk (X-ray spectral analysis) and surface (X-ray photoelectron spectroscopy) during their wetting and limited wetting with water is presented. The possible causes of the observed phenomena are discussed.
PACS numbers: 82.45.Cc