ZINC-NICKEL COMPOSITE PLATING BATH, ZINC-NICKEL COMPOSITE PLATING FILM, DIE AND PLATING METHOD

PROBLEM TO BE SOLVED: To provide a zinc-nickel composite plating bath capable of suppressing both of the sticking of deposits derived from calcium, bacteria or the like and the sticking of corrosive products caused by corrosion, a zinc-nickel composite plating film, a die and a plating method.SOLUTION: Provided is a zinc-nickel composite plating bath comprising: a zinc source; a nickel source; silicon dioxide particles 22; and an ammonium based dispersion material so as to be in the ranges capable of obtaining a zinc-nickel composite plating film 10 in which the eutectoid amount of nickel is 10 to 16 wt%, and also, the eutectoid amount of silicon dioxide grains 22 is 7 Vol% or more. Further, the pH of the zinc-nickel composite plating bath is 5.6 to 6.8.SELECTED DRAWING: Figure 1 【課題】カルシウムやバクテリア等に由来する堆積物が付着することと、腐食により生じる腐食生成物が付着することとの両方を抑制できる亜鉛−ニッケル複合めっき浴、亜鉛−ニッケル複合めっき被膜、金型及びめっき方法を提供する。【解決手段】亜鉛−ニッケル複合めっき浴は、ニッケルの共析量が１０〜１６Ｗｔ％、且つ二酸化ケイ素粒子２２の共析量が７Ｖｏｌ％以上の亜鉛−ニッケル複合めっき被膜１０が得られる範囲となるように、亜鉛源と、ニッケル源と、二酸化ケイ素粒子２２と、アンモニウム系分散材とを含む。また、亜鉛−ニッケル複合めっき浴のｐＨは５．６〜６．８である。【選択図】図１