Coating film sliding parts and piston

This invention relates to a surface treatment method comprising the steps of providing a treating solution containing a specific ammonium compound or aqueous ammonia, and magnesium silicofluoride, heating the treating solution to a temperature of 70 to 100° C., and soaking aluminum or an aluminum al...

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Bibliographic Details
Main Author NOMURA MASAYA,OSAKI YOSHINOBU
Format Patent
LanguageEnglish
Published 07.03.2007
Subjects
BLASTING
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
CYLINDERS
DIFFUSION TREATMENT OF METALLIC MATERIAL
ENGINEERING ELEMENTS AND UNITS
GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS
HEATING
INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL
LIGHTING
MECHANICAL ENGINEERING
METALLURGY
PISTONS
SEALINGS
SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
THERMAL INSULATION IN GENERAL
WEAPONS
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Summary:This invention relates to a surface treatment method comprising the steps of providing a treating solution containing a specific ammonium compound or aqueous ammonia, and magnesium silicofluoride, heating the treating solution to a temperature of 70 to 100° C., and soaking aluminum or an aluminum alloy in the treating solution; a piston having a surface coated with a film consisting of a mixture of NH4MgAlF6 and MgAlF5.1.5H2O or a mixture of NH4MgAlF6 and MgAl2F8.2H2O; and a sliding member made of aluminum or the like wherein the whole surface of the sliding member or the sliding surface thereof is coated with a film which consists of either of the aforesaid mixtures, has a cubic crystal structure, and shows no crystalline orientation. The present invention can provide a surface treatment method which requires simple equipment, can reduce treatment costs, and can yield aluminum or an aluminum alloy having excellent abrasion resistance, corrosion resistance and other properties, as well as sliding members and pistons having excellent abrasion resistance and other properties.
Bibliography:Application Number: CN200410042001