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The nucleation and growth of a lead phosphate film on homogeneous lead amalgam

✍ Scribed by James A. Cox; Marcin Majda

Publisher
Elsevier Science
Year
1980
Tongue
English
Weight
437 KB
Volume
25
Category
Article
ISSN
0013-4686

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✦ Synopsis

The electrochemical oxidation of Pb(Hg) in acidic phosphate medium results in formation of a monomolecular PbHPO, passivating film. Analysis of potentiostatic current-time transients demonstrated that the crystallization occurred through a 2-dimensional progressive nucleation and growth mechanism. The potential dependence of the combined nucleation and crystallization rate constants was [7.8 k 0.7 mV/decade]-'. The formation of a soluble lead phosphate species prior to film growth was observed under certain conditions. Examination of i&t curves in this region by the low overpotential form of the Cottrell equation indicated that the soluble species was PbHPO,.

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