抄録
The properties of sheet steels plated with vacuum evaporated zinc coatings depend upon coating conditions, which have not been thoroughly studied.
The authors made basic studies on vacuum evaporated Zn coatings such as coating conditions, film structures, special pre-treatment of substrate.
This paper describes the results obtained concerning appearance and morphology of vacuum evaporated zinc coatings, which have a close relationship to the mechanism of film growth.
(1) The temperatures of the substrate and evaporating source on evaporation had great effects on the deposition of zinc and the morphology of film surface. The appearance of coatings depended upon the surface morphology.
(2) The crystal orientation of Zn film depended upon the temperature of substrate in the range of deposition rate (Vd) of 0.5μ/min.>Vd>0.05μ/min.
As the results of experiments, the range of substrate temperature (Tp) was broadly divided into the following three divisions: Tp<50°C, 60°C<Tp<160°C, and 170°C<Tp.
(3) The grain size of Zn crystals was larger with the increase in film thickness when the substrate temperature was lower than 160°C. The size was larger with the rise in substrate temperature for the same film thickness. The crystal orientation was varied according to the film thickness when the substrate temperature was higher than 170°C.
