SURFACE TREATMENT METHOD FOR ALUMINUM WHEEL AND ALKALI ETCHING LIQUID

• Main Authors: YAMADA TAKESHI, FUJII YOSHITOMO, MINO YASUTAKE
• Format: Patent
• Language: English
• Published: 15.04.2010
• Subjects: ADHESIVES; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL; CHEMICAL PAINT OR INK REMOVERS; CHEMICAL SURFACE TREATMENT; CHEMISTRY; CLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICALMETHODS OTHER THAN ELECTROLYSIS; 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 COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; CORRECTING FLUIDS; DIFFUSION TREATMENT OF METALLIC MATERIAL; DYES; FILLING PASTES; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; INKS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25; NATURAL RESINS; NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; PERFORMING OPERATIONS; POLISHES; PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL; SPRAYING OR ATOMISING IN GENERAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING; USE OF MATERIALS THEREFOR; WOODSTAINS

PROBLEM TO BE SOLVED: To realize a surface treatment method for an aluminum wheel which can provide an aluminum wheel having excellent corrosion resistance. SOLUTION: In the surface treatment method for an aluminum wheel, an aluminum wheel not subjected to shot blasting is subjected to etching treatment where an etching amount in an A6061P aluminum material reaches 3 to 15 g/m2using an alkali etching liquid, and is thereafter subjected to a degreasing stage, a water-washing stage, a pickling stage, a water-washing stage, a film-conversion stage, a water-washing stage, pure water-washing stage, a drying stage and a powder coating stage in this order. The alkali etching liquid includes KOH and/or NaOH, a surfactant, the alkali metal salt of condensed phosphoric acid and a chelating agent. The concentration of the KOH and/or NaOH is 10 to 40 g/L in total, while the concentration of the surfactant is 0.5 to 5 g/L, the concentration of the alkali metal salt of condensed phosphoric acid is 1 to 10 g/L and the concentration of the chelating agent is 0.5 to 5 g/L. COPYRIGHT: (C)2010,JPO&INPIT