cpomaemКоррозия: защита материалов и методы исследованийTitle in englishИФХЭ РАН10.61852/2949-3412-2024-2-3-111-130cpomaem-69Research ArticleСтатьиВлияние знакопеременной поляризации на коррозию и наводороживание углеродистой стали в хлоридных растворах с рН близким к нейтральномуThe effect of cyclic potential pulse on corrosion and hydrogenation of carbon steel in chloride solutions with a pH close to neutralРыбкинаА. А.RybkinaA. A.

119071, Москва, Ленинский проспект, д. 31, корп. 4

 Leninsky pr. 31, 119071 Moscow

aa_rybkina@mail.ruМизитовК. В.MizitovK. V.

119071, Москва, Ленинский проспект, д. 31, корп. 4

 Leninsky pr. 31, 119071 Moscow

МаршаковА. И.MarshakovA. I.

119071, Москва, Ленинский проспект, д. 31, корп. 4

 Leninsky pr. 31, 119071 Moscow

Институт физической химии и электрохимии им. А.Н. Фрумкина РАНРоссияA.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of SciencesRussian Federation20241709202403111130Copyright © Рыбкина А.А., Мизитов К.В., Маршаков А.И., 20242024Рыбкина А.А., Мизитов К.В., Маршаков А.И.Rybkina A.A., Mizitov K.V., Marshakov A.I.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.cpmrm.ru/jour/article/view/69

Значительные флуктуации потенциала катодной защиты под действием блуждающих токов приводят к образованию локальных видов коррозии стальных сооружений, эксплуатирующихся в грунтах и морской воде. Флуктуации потенциала, индуцированные источниками как переменного, так и постоянного тока, могут моделироваться циклированием прямоугольной ступени потенциала. В данной работе изучено влияние знакопеременной циклической поляризации (ЦИП) на общую и локальную коррозию углеродистой стали в 3,5% растворе NaCl c боратным буфером (рН 6.7) и без него. Уменьшение потенциала катодного полупериода (Екат) ЦИП тормозит общую коррозию и ускоряет локальную коррозию стали в обоих растворах, что связано с увеличением количества водорода в металле. Увеличение продолжительности катодного полупериода ЦИП увеличивает плотность и суммарную площадь питтингов при менее отрицательных значениях Екат. При более отрицательных Екат увеличение продолжительности катодной поляризации снижает интенсивность локальной коррозии стали в небуферированном хлоридном растворе. Этот эффект объяснен блокированием центров зарождения питтингов на поверхности металла слоем продуктов растворения стали, образующихся в приэлектродном слое электролита с высоким рН.

At more negative Еc values, an increase in the duration of cathodic polarization reduces the intensity of steel local corrosion in the unbuffered chloride solution. This effect is explained by blocking of the pit nucleation centers on the metal surface by a layer of steel dissolution products formed in the near-electrode electrolyte layer with a high pH. Significant fluctuations in the cathodic protection potential under the influence of stray currents lead to the formation of local types of corrosion of steel structures operating in soils and seawater. The potential fluctuations induced by both alternating and direct current sources can be modeled by cycling a square potential stage. In this paper, the effect of cyclic potential pulse (CIP) on the general and local corrosion of low-carbon steel in 3.5% NaCl solution with borate buffer (pH 6.7) and without it is studied. A decrease in the cathodic half-period potential (Ec) of the CIP inhibits general corrosion and accelerates local corrosion of steel in both solutions, which is associated with an increase in the amount of hydrogen in the metal. An increase in the duration of the cathodic half-period of the CIP increases the density and total area of the pitting at less negative values of the Ec. At more negative Еc values, an increase in the duration of cathodic polarization reduces the intensity of local.

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The authors declare that there are no conflicts of interest present.