Composite chromium plating film and sliding member having the same and method for manufacture thereof
AssigneeRiken
InventorsTakeo Oshimi, Kiyotaka Oku, Katsumi Takiguchi
Life of this patent
Estimating the term…
Abstract
A composite chromium plating film containing hard particles in network-shaped microcracks, a surface-occupying ratio of the microcracks being 10 to 20% by area, a distribution density of the microcracks being 1,200 to 2,500/cm, and the amount of the above hard particles being 1 to 15% by mass per 100% by mass of the above entire plating film. This composite chromium plating film has excellent wear resistance and scuffing resistance with small attacking ability to a mating member.
Claims5
A composite chromium plating film containing hard particles in network-shaped microcracks, said microcracks having a surface-occupying ratio of 10 to 20% by area and a distribution density of 1, 200 to 2,500/cm, and the amount of said hard particles being 1 to 15% by mass per 100% by mass of the entire plating film.
A method for producing a sliding member comprising conducting at least one cycle comprising (a) forming a hard chromium plating layer on a sliding surface of a sliding member substrate, and (b) subjecting the resultant hard chromium plating layer to an inverse voltage treatment, in a state where said substrate is immersed in a chromium-plating bath containing at least chromium oxide, sulfuric acid, silicofluoride, a sulfonic-group-containing compound or its salt, an anionic surfactant and hard particles.
Dependencies are inferred from the claim text.