(400e) Mass Transfer and Current Distribution of Hydrodynamic Electroplating Test Cells

The hydrodynamic electroplating test cells of sector and triangular shapes, named HETC and M-HETC (modified-hydrodynamic electroplating test cell), respectively, have been investigated in this study. The current density distribution and mass transfer for the HETC and M-HETC, which can provide well-defined fluid flow, are studied. Through theoretical study and simulative results, M-HETC does provide a wide range of current density distribution like the traditional Hull cell. The flow field of M-HETC is divided into a main vortex and two sub vortices. The mass transfer coefficient of position from cylinder 7cm is greater than mass transfer coefficient of position from cylinder 5cm on account of the fluid of main vortex flows in distinct direction. From the results of deposit thickness measurements, if they were operated under conditions of high electrolyte concentration, high rotating speed, low applied voltage or current, the experimental current density distribution would be close to primary current density distribution. With the enforced hydrodynamic rotating flow, the HETC and M-HETC can serve as a good test cell for electroplating.