The initial stage of salt passivation of metals

A theoretical model of the nucleation of a passivating salt layer on the surface S of an anode-dissolving metal was developed. The layer is considered a new phase formed by the mechanism of heterogeneous nucleation, which serves as a related substrate for subsequent growth of the passivating layer. According to experiments, the surface S of real metals is inhomogeneous, that is, anode current density fluctuates on S. It is assumed that, at large current fluctuations, localized regions with volume ΔV φ appear, in which the C M and C A concentrations of the M z+ and A n- ions are increased. At fairly large current fluctuations, these concentrations can reach saturation. For this reason, the ΔV φ regions are treated as mother phases, in which A a M m salt nuclei are formed with a certain probability. The formation of such ΔV φ volumes and the kinetics of formation of nuclei in them, from which a passivating layer with a finite thickness is formed, are considered. © 2010 Pleiades Publishing, Ltd.

Редакторы
-
Издательство
-
Номер выпуска
12
Язык
Английский
Страницы
2143-2147
Статус
Опубликовано
Подразделение
-
Номер
-
Том
84
Год
2010
Организации
  • 1 Karpov Research Institute of Physical Chemistry, Ul. Vorontsovo pole 10, Moscow 105064, Russian Federation
  • 2 Peoples Friendship University, Ul. Miklukho-Maklaya 6, Moscow 117198, Russian Federation
Ключевые слова
Anode current density; Finite thickness; Heterogeneous nucleation; Initial stages; Large current; Passivating layer; Real metals; Salt layers; Theoretical models; Nucleation; Passivation
Дата создания
19.10.2018
Дата изменения
19.10.2018
Постоянная ссылка
https://repository.rudn.ru/ru/records/article/record/2658/