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    • 68. 发明专利
    • COMPOSITE PLATING METHOD FOR IRON AND STEEL TYPE MATERIAL
    • JPS572893A
    • 1982-01-08
    • JP7427780
    • 1980-06-04
    • NIPPON PISTON RING CO LTD
    • ONODA MOTONOBU
    • C25D15/02C25D3/24C25D5/36
    • PURPOSE:To provide excellent adhesiveness for composite plating to iron and steel type materials as well and permit the utilization of the superior performance thereof over a wide range by removing the tough oxide film of the surface of the material to be plated by electrolytic polishing as pretreatment for plating. CONSTITUTION:In composite plating of parts of internal combustion engine parts where abrasion resistance is required, for example, plating wherein SiC power is mixed in an Ni plating layer, the stains of the surfaces of the object to be plated are removed by degreasing. Next, the object to be plated is electrolytically polished by using electrolytic polishing liquid such as, for example, phosphoric acid, sulfuric acid and water (7:2:1), whereby the tough oxide surface of the surfaces is removed. In this treatment, smut sticks on the object to be plated and therefore this is removed by acid immersion (for example in about 20% volume sulfuric acid at about 70-90 deg.C until gas is produced uniformly) or cathodic treatment (for example 20% volume sulfuric acid, ordinary temp.). Finally, composite plating is applied.