Collect. Czech. Chem. Commun. 1994, 59, 1305-1310

Formation of Barrier Oxide Film on Lead in Borate Solutions

Emad E. Abdel Aal and Mohamed M. Hefny

Department of Chemistry, Faculty of Science, U.A.E. University, P.O. Box: 17551, Al-Ain, United Arab Emirates


Galvanostatic anodization of lead in borate solutions reveals that lead can form a barrier type oxide film. The rate of growth, R, fulfils the empirical relation, R = aib within the current density i range from 1.16 .10-4 to 3.19 .10-4 A cm-2. The magnitudes of the parameters a and b are 6.9 . 103 and 1.6, respectively, it has been found that the high field approximation is applicable for the oxide growth on lead. The coefficients of the dependence of R on solution temperature, T, pH and borate ion concentration, c, viz. (∂R/∂T), (∂R/∂pH) and (∂R/∂log c) are -18 . 10-4, -0.13 and 0.41, respectively.