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Studies on the anodic and cathodic polarization of amalgams—V. the behaviour of tin amalgams in alkaline solutions by A.M. Shams El Din; L.A. Kamel is a Engineering article available to read on EtoBox.

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Tin-amalgams of varying concentrations were oxidized galvanostatically in O-01,0-10 and 2~00 N NaOH solutions at 25°C. For each amalgam and solution composition a number of constant polarizing currents were used and cyclization was repeated until the oxidation (reduction) features of the amalgam became apparent. Two different oxidation patterns were distinguished. The first describes the behaviour of all amalgams in O-01, O-1 N NaOH, and of concentrated amalgams in 2 N NaOH, and the second for the behaviour of dilute tin amalgams in 2 N NaOH solutions. The oxidation curves in O-01, O-1 N NaOH showed regions for the dissolution of the sodium amalgam formed during eathodization, for the charging of the anodic double layer, and for the formation of a Sn(OH), film on the surface of the electrode, before the evolution of oxygen. The oxidation curves of dilute Sn amalgams in 2 N NaOH showed a region of oscillations in potential and the development of an arrest for HgO. The relation between the current, i, and time of passivation, 7, was found to be log7= A -?zlogi, where A and zi are constants. The results indicate that the passivation of Sn amalgams in alkaline solutions is governed by

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Author

A.M. Shams El Din; L.A. Kamel

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0013-4686)

Published

1972

Language

EN

Field

Engineering (Physical Sciences)