Abstract
The following results were obtained in the measurement of dragout of chromium plating solution. (1) The dragout of chromium plating solution was little affected by CrO3 concentration under definite conditions of temperature and surface tension of the plating solution and the shape, size, and hanging and drawing up methods of the specimen. (2) The dragout of the solution was affected by the factors of W, WD1, and WD2 as follows: in which, W: The dragout published by Kushner, WD1: The liquid remained on the lower side of specimen. and WD2: The liquid film on the surface of specimen. The latter two values were obtained from the authors' experiments. The following relations were derived:
W=0.02A√Uφ/d
WD1=(0.65±0.1)s/dgl
WD2=0.001A
where A: Surface area of specimen (cm2), l: Length of lower side of specimen (cm), U: Velocity of drawing up (cm/sec.), φ: Viscosity of plating solution (poise), d: Density of plating solution (g/cm3), s: Surface tension of plating solution (dyne/cm), g: Gravitation (980 dyne)
(3) When W<WD1+WD2, no liquid drops remained on the specimen and the real dragout was expressed by W; and when W>WD1+WD2, liquid drops corresponding to W-(WD1+WD2) remained and the real dragout was expressed by WD1+WD2.
