日本金属学会誌

J. Japan Inst. Met. Mater, Vol. 78, No. 1 (2014),
pp. 31-36

Effects of Silica Nanoparticle Co-deposition on Macrothrowing Power of Zinc-Nickel Alloy Plating from an Acid Sulfate Bath

Makoto Hino1, Koji Murakami2, Ken Muraoka2, Norihito Nagata3 and Teruto Kanadani4

1Department of Mechanical Systems, Faculty of Engineering, Hiroshima Institute of Technology, Hiroshima 731-5193
2Industrial Technology Research Institute of Okayama Prefecture, Okayama 701-1296
3SURTECH NAGATA Co., LTD., Akashi 673-0082
4Department of Mechanical Systems, Faculty of Engineering, Okayama University of Science, Okayama 700-0005

Abstract:

Zinc-nickel-SiO2 electrodeposits have been produced from an acid sulphate bath. The co-deposition behavior of SiO2 and the macrothrowing power of platings were examined. The presence of SiO2 nanoparticles in the plating bath appears to change the alloy deposition behavior. The rate of nickel deposition was considerably decreased with SiO2 nanoparticles in the bath. The macrothrowing power of plating was improved by adding the SiO2 nanoparticles in the bath. At an early stage of electrodeposition, it seems that the SiO2 nanoparticle acts as a nucleus of the precipitation. The SiO2 nanoparticles did not disperse uniformly in a plating film, but distributed only in the SiO2 rich layer with about 50 nm in thickness formed beneath the surface. In addition, this SiO2 rich layer can improve the anticorrosive performance. Therefore, the zincic use can be suppressed, because the film thickness can be more thinned, compared with zinc and zinc-nickel alloy electroplating. [doi:10.2320/jinstmet.J2013059]


(Received 2013/8/26)

Keywords:

zinc-nickel alloy plating, SiO2 nanoparticle co-deposition, anticorrosive performance, resources depletion problem


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