METHOD OF A TITANIUM ALLOY SURFACE PHOSPHATIZATION Russian patent published in 2005 - IPC

FIELD: aircraft industry; space industry; motor-car industry; shipbuilding; construction industry; chemical treatment of titanium alloys surfaces.

SUBSTANCE: the invention is pertaining to the methods of chemical treatment of titanium alloys surfaces, in particular, to the methods of treatment of titanium alloys surfaces for improvement of their adhesiveness for lacquer coatings (LC) and may be used in various industries, including aircraft, space, motor-car industry, shipbuilding, construction and architecture, etc. where titanium alloys with decorative coloring are applied. The method provides for degreasing, water flushing, phosphatization of a titanium alloy surface using treatment with a water solution containing ions of zinc, ions of phosphate, ions of nitrate, a repeated water flushing and drying. At that before the phosphatization a titanium alloy surface is treated with an oxidation solution on the basis of a mixture of nitrogen and etching acids or magnesium oxide. The solution for phosphatization is additionally introduced with ions of sulfate, ions of fluorine and ions of tartrate at following ratio of components, g/l: PO₄ ^-3 4.0-75.0, Zn⁺² 3.0-16.0, SO₄ ^-2 2.07.0, NO₃ ^-1 41.0-206.0, F^-1 1.0-3.5, (C₄H₄O⁶)^-2 1.8-9.0. The technical result is an increased adhesive capability of a titanium alloy surface for application of the lacquer coatings without hydrogenation of the surface.

EFFECT: the invention ensures an increased adhesive capability of a titanium alloy surface for application of the lacquer coatings without hydrogenation of the surface.

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