Narasimhan, K.C. (1972) Studies on the electrodeposition of lead dioxide. PhD thesis, Sri Venkateswara University.

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Abstract

The oxide formation by the anodic oxidation of solutions of the salts of metals is a group of reactions of considerable interest. Most of these oxides exist in two or more modifications. The anodic oxidation of plumbous salts can be considered as one of the examples of these reactions. Interest in the use of lead dioxide as anode for the preparation of inorganic and organic chemicals has been very much in evidence by number of publications. As an extension of the earlier work, where lead dioxide was deposited on graphite from nitrate bath using either rotation or to-and-fro motion, the electrode position of lead dioxide on a stationary graphite anode from a nitrate bath containing cationic surfactant, viz. cetyl trimethyl ammonium bromide (CTAB) was studied and it was found that smooth, adherent and pore-free deposit could be obtained from such a bath on a stationary anode employing even higher current densities. To obtain a similar pore-free and adherent deposit, the effect of ultrasonic during the deposition of lead dioxide on the graphite substrate was studied and the desired results were achieved. The X-ray analysis of the samples obtained at the above conditions showed that the lead dioxide was β-variety. The kinetic studies on electrode position of lead dioxide from nitrate solutions were carried out using galvanostatic pulse technique as well as potentiodynamic technique. Preliminary studies were carried out on the kinetics of electrode position of lead dioxide from a nitrate bath containing CTAB. The graphite substrate lead dioxide anode was used to get lead dioxide powder from nitrate bath by adjusting the operating conditions. It was further shown that the formation of lead dioxide onto lead and its alloys in sodium chloride solution was possible when lead dioxide microelectrode was embedded into the lead, similar to the use of platinum microelectrode reported by Shreir. Such anodes find applications in cathodic protection.

Item Type:	Thesis (PhD)
Uncontrolled Keywords:	Electrodeposition; metal finishing
Subjects:	Electrodeposition Industrial Metal Finishing
Divisions:	UNSPECIFIED
Depositing User:	Dr. N Meyyappan
Date Deposited:	13 Jun 2012 03:56
Last Modified:	13 Jun 2012 03:56
URI:	http://cecri.csircentral.net/id/eprint/2814

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