電解複合めっき法による親水性Ni-Zn/TiO_2皮膜の作製

概要

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Hydrophilic Ni-Zn alloy films were prepared by electrolytic composite-plating with Titanium oxide (TiO2) fine particles. As the amount of dispersed TiO2 particles in the plating bath increased, the amount of co-deposited TiO2 increased and reached a constant value at 60 gdm-3 of dispersed TiO2: and the surface roughness and weight ratio of Ni atoms to Zn atoms also increased. The Ni-Zn/TiO2 composite-plated film a showed higher contact angle against water droplets than the Ni-Zn plated film for the common measurement, although the TiO2 plate prepared by the Sol-gel method showed a lower value than the other plated films. Two other measurements of contact angle employed suggested that a hydrated layer was formed on the TiO2 particle surface and the adherent water on the layer spread over the composite-plated film surface. Then this spread water induced spreading area of the hydrated layer and consequently improved the wettability of the film surface. It was also implied that wettability of the film surface improved with the increase of co-deposited TiO2 particles and the decrease of roughness with grinding. A composite-plated film by 4 wt% of co-deposited TiO2 particles gave a 25 degree contact angle. The Ni-Zn/TiO2 composite-plated film was found to have corrosion resistance equal to Ni-Zn plated films.
社団法人表面技術協会の論文
2003-07-01