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Improving the throwing power of acidic zinc sulfate electroplating baths
Author(s) -
Ibrahim Magdy A M
Publication year - 2000
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/1097-4660(200008)75:8<745::aid-jctb274>3.0.co;2-5
Subject(s) - adsorption , zinc , chemistry , scanning electron microscope , inorganic chemistry , electroplating , throwing , sulfate , overpotential , sodium dodecylbenzenesulfonate , plating (geology) , chemical engineering , ionic strength , materials science , layer (electronics) , composite material , electrochemistry , electrode , organic chemistry , aqueous solution , mechanical engineering , geophysics , engineering , geology
The effect of some plating parameters, such as Zn 2+ ion concentration, pH, current density, temperature and duration on the throwing power, as well as on the throwing index of acidic zinc sulfate baths has been investigated. The addition of p ‐anisidine (PA) and/or sodium dodecylbenzenesulfonate (DBS) has been examined as a possible means of improving the uniformity of deposit distribution. The additives cause a substantial increase in the overpotential for the reduction of Zn 2+ ions and consequently improve the throwing power of the baths. The throwing power increases by a factor of four in the presence of DBS and a factor of one‐and‐a‐half in the presence of PA. The inhibition of zinc reduction was assumed to occur via adsorption of the PA or DBS molecules on the cathode surface and the adsorption followed the Langmuir adsorption isotherm. The surface morphology of the zinc plated with and without the additives was examined by using scanning electron microscopy (SEM). © 2000 Society of Chemical Industry