KINETICS OF PASSIVATION OF LEAD IN PHOSPHATE SOLUTIONS

被引：14

作者：

HEFNY, MM ^{[1
]}

BADAWY, WA ^{[1
]}

ELEGAMY, SS ^{[1
]}

机构：

[1] UNIV CAIRO,FAC SCI,DEPT CHEM,GIZA,EGYPT

来源：

ELECTROCHIMICA ACTA | 1990年 / 35卷 / 05期

关键词：

D O I：

10.1016/0013-4686(90)90071-7

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

A kinetic study on passivation of lead in phosphate media was made by potential and impedance measurements. In pH's > 2.01, the potential gets nobler with time, indicating passivation of the lead electrode. This was confirmed from measurements of the relative change in the thickness of the passive layer which was found to increase with time following a direct logarithmic law. The magnitude of the rate of growth of the layer as well as the discontinuity in this rate were correlated with the mechanism of film growth. Layers grown in the pH range 2.01-4.60 are adherent and thin, whereas those formed in pH's >4.6 are thicker and porous. © 1990.

引用

页码：799 / 803

页数：5

共 20 条

[1] DIAGNOSTIC CRITERA FOR DISTINGUISHING BETWEEN DISSOLUTION-PRECIPITATION AND SOLID STATE MECHANISMS OF PASSIVATION [J].