Rubber part having a metal fitting and method of producing the same
View Patent ↗A rubber part having a metal fitting in which the metal fitting and the rubber part are integrated through an anti-corrosion chemical film formed on a surface of the metal fitting. The anti-corrosion chemical film is a zirconium-based chemical film that is harmless to human body and environment, and is transformable following the squeeze of the metal fitting. The rubber part having a metal fitting is produced by the steps of: degreasing an outer peripheral surface of the metal fitting, subjecting the surface to shot blasting treatment, degreasing the treated surface, and water washing the treated surface; forming a zirconium-based chemical film on the treated surface; water washing and drying an outer peripheral surface of the zirconium-based chemical film; forming an adhesive layer on the outer peripheral surface of the zirconium-based chemical film; and integrating the rubber part on the outer peripheral surface of the adhesive layer.
1. A rubber part having a cylindrical metal fitting, the cylindrical metal fitting and the rubber part being integrated through an anti-corrosion chemical film formed on a surface of the metal fitting, the anti-corrosion chemical film being a zirconium-based chemical film, wherein the diameter of the cylindrical metal fitting is reduced after the zirconium-based film is formed on the cylindrical metal fitting.
2. A method of producing a rubber part having a cylindrical metal fitting, comprising steps of forming an anti-corrosion zirconium-based chemical film on a surface of the cylindrical metal fitting; and integrating the cylindrical metal fitting and the rubber part through the zirconium-based chemical film, the method further comprising steps of:
degreasing the surface of the cylindrical metal fitting, subjecting the surface to shot blasting treatment, degreasing the treated surface, and water washing the treated surface in advance of forming the zirconium-based chemical film; and
water washing and drying the surface of the metal fitting formed with the zirconium-based chemical film after the film is formed; and
reducing the diameter of the cylindrical metal fitting after forming the zirconium-based chemical film on the surface of the metal fitting.