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Characteristics of the Mechanism of Corrosion of Low-Carbon Steels in Acid Solutions Containing Fe(III) Saltsстатья
Информация о цитировании статьи получена из
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 1 декабря 2021 г.
- Авторы: Avdeev Ya G., Andreeva T.E.
- Журнал: Russian Journal of Physical Chemistry A
- Том: 95
- Номер: 6
- Год издания: 2021
- Издательство: Pleiades Publishing, Ltd
- Местоположение издательства: Road Town, United Kingdom
- Первая страница: 1128
- Последняя страница: 1136
- DOI: 10.1134/S0036024421060029
- Аннотация: Abstract—Corrosion of low-carbon steel corrosion in 2.0 M H2SO4 and 2.0 M H3PO4 containing Fe(III) salts is studied using the mass loss of metal specimens and voltammetric measurements on a rotating disk electrode. It is established that during steel corrosion in mineral acid solutions containing Fe(III) salts, the anodic ionization of metallic iron proceeds in the kinetic region. The cathodic reaction combines the parallel and independent processes of the kinetically controlled hydrogen evolution and the diffusion-controlled reduction of Fe(III) cations to Fe(II). The potentiometry and cyclic voltammetry on a platinum electrode in acid solutions containing Fe(III) salts shows that Fe(III) cations in these media are bound into complexes with acid anions. The stronger the complexes formed by Fe(III) cations, the lower their oxidation potential anddiffusion coefficient. The drop in the diffusion coefficient of Fe(III) cations in mineral acid solutions affects the rate of their diffusion-controlled reduction on steel. Introducing FePO4 into a H3PO4 solution accelerates corrosion of low-carbon steel less than an equimolar Fe2(SO4)3 additive in a H2SO4 solution. The effect is aresult of the lower diffusion coefficient of Fe(III) cations in a H3PO4 solution, relative to a H2SO4 solution.
- Добавил в систему: Авдеев Ярослав Геннадиевич