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About the observance of the Nernst equation in acid corrosive media containing oxidative cationsстатья
Информация о цитировании статьи получена из
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 27 июля 2022 г.
- Авторы: Avdeev Ya G., Andreeva T.E., Anfilov K.L., Kuznetsov Yu I.
- Журнал: International Journal of Corrosion and Scale Inhibition
- Том: 11
- Год издания: 2022
- Издательство: Некоммерческое партнерство коррозионистов "Вакор"
- Местоположение издательства: Москва
- Первая страница: 752
- Последняя страница: 761
- DOI: 10.17675/2305-6894-2022-11-2-20
- Аннотация: Potentiometry on a platinum electrode in the temperature range of 20–95°C was used to study the redox properties of 2 М H2SO4, 2 М HCl, 2 М H3PO4, 1 М H3PO4 + 1 М H2SO4, and 1 М H3PO4 + 1 М HCl solutions containing Fe(III) and Fe(II) salts. The redox potentials of systems in the solutions in question are poorly described by the Nernst equation. The observed deviations result from the non-equivalent complexation of potential-determining species, namely Fe(III) and Fe(II) cations, with anions present in a solution due to dissociation of the acids. The active concentrations of Fe(III) and Fe(II) cations in these systems change non-equally, which affects the redox potential of a system. The deviation of a system’s redox properties from the Nernst equation is the stronger the higher the complexing ability of the ligands formed from the acid. Among the media studied, the greatest deviation of the redox properties of the Fe(III)/Fe(II) redox couple from the theoretical values is observed in media containing H3PO4. The observed effects should be taken into account in the creation and operation of corrosion inhibitors for low-carbon steels in mineral acid solutions containing Fe(III) and Fe(II) salts, since their efficiency considerably depends on the oxidative capability of these environments.
- Добавил в систему: Авдеев Ярослав Геннадиевич