| 摘要 |
PURPOSE:To obtain an electroless plating liquid which forms a uniform plating film on a powder and granular core material by using ammonia for the complexing agent of the electropless plating liquid consisting of at least an Ni salt, reducing agent, pH adjusting agent and complexing agent. CONSTITUTION:Ammonia or salt thereof (ammonium sulfats, ammonium chloride, etc.) is used as a complexing agent in an electroless plating liquid consisting of at least an Ni salt (nickel sulfate, etc.), reducing agent (sodium hypophosphite, etc.), pH adjusting agent (sodium hydroxide, etc.) and complexing agent. The molar ratio of the plating liquid is made Ni:NH3:NaHPO2=1:1.5-4:2-2.5. A powder and granular core material is subjected to a plating treatment while said electroless plating liquid is controlled and added to an aq. suspension in which said core material is dispersed. A uniform plating film is thus provided to the core material and the film thickness thereof is freely settable with good accuracy. |
