COLORED EXTERNAL PARTS OF TITANIUM OR TITANIUM ALLOY

• Main Author: SHIBAZAKI YASUO
• Format: Patent
• Language: English
• Published: 09.01.1988
• Subjects: APPARATUS THEREFOR; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; ELECTROFORMING; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; HOROLOGY; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; MECHANICALLY-DRIVEN CLOCKS OR WATCHES; METALLURGY; PERFORMING OPERATIONS; PHYSICS; PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL; PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS; SPRAYING OR ATOMISING IN GENERAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS; TRANSPORTING

PURPOSE:To produce external parts which are hard and are resistant to staining by forming a glassy coating film formed of a liquid mixture composed of specific ratios of sodium silicate and silica sol as a protection for a thin film of a Ti metal which is electrolytically colored by anodic oxidation. CONSTITUTION:An agent for forming a film colorable by anodic oxidation formed by adding >=1 kinds of inorg. compd. selected from 10-60g/l Na2MoO4.2 H2O, 10-60g/l (NH4)2HPO4, and 5-30g/l NaF to water is prepd. The anodically oxidized film of the Ti or Ti alloy is electrolytically colored by using such electrolyte and applying 5-90V DC thereto at <=50 deg.C. The liquid mixture composed of the sodium silicate and silica sol at 5-10/1 mixing ratio (glassy film) is thereafter coated on the surface thereof and is dried to form the hard protective film on the surface colored by the anodic oxidation.