cpomaemКоррозия: защита материалов и методы исследованийTitle in englishИФХЭ РАН10.61852/2949-3412-2023-1-4-89-100cpomaem-30Research ArticleСтатьиАдсорбционное и пассивационное поведение медного сплава комплексами фталоцианинов в водном хлоридном раствореAdsorption and passivation behavior of copper alloy by phthalocyanine complexes in an aqueous chloride solutionАндрееваН. П.AndreevaN. P.

119071

Ленинский просп., 31, корп. 4

Москва

119071

Leninsky prospect, 31, bldg. 4

Moscow

АгафонкинаМ. О.AgafonkinaM. O.

119071

Ленинский просп., 31, корп. 4

Москва

119071

Leninsky prospect, 31, bldg. 4

Moscow

agafonkina@inbox.ruФГБУН «Институт физической химии и электрохимии им. А.Н. Фрумкина РАН (ИФХЭ РАН)»РоссияFrumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of SciencesRussian Federation2023050120240489100Copyright © Андреева Н.П., Агафонкина М.О., 20242024Андреева Н.П., Агафонкина М.О.Andreeva N.P., Agafonkina M.O.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.cpmrm.ru/jour/article/view/30

   В работе исследованы адсорбционные и защитные свойства терафталанатриевой соли 4,5-октакарбоксифталоцианина на поверхности медного сплава МНЖ5–1 в нейтральном боратном буферном растворе. Терафтал подавляет активное анодное растворение сплава МНЖ5–1 в 0,01 М хлоридном буфере рН 7,40. Защитный эффект увеличивается при Син =1,2 мкмоль/л с 0,18 В до 0,35 В при 25 мкмоль/л. Энергия адсорбции (-Δ𝐺0𝑎,𝑚𝑎𝑥) терафтала на поверхности сплава МНЖ5–1 при Е=0,0 В равна 78,8 кДж/моль. Такое значение указывает на хемосорбцию ингибитора на поверхности электрод, которая происходит за счет атомов кислорода карбоксильных групп. Толщины адсорбированного слоя, определенные методами эллипсометрии ≈0,3 нм, что указывает на плоское расположение терафтала на поверхности.

   The adsorption and protective properties of teraphthal, the sodium salt of 4.5-octacarboxyphthalocyanine, on the surface of the copper alloy MNZh5-1 in a neutral borate buffer solution were studied. Teraphthal suppresses active anodic dissolution of the MNZh5-1 alloy in 0.01 M chloride buffer pH 7.40. The protective effect increases at Сinh = 1.2 µmol/l from 0.18 V to 0.35 V at 25 µmol/l. The adsorption energy (-Δ𝐺0𝑎,𝑚𝑎𝑥) of teraphthal on the surface of the MNZh5-1 alloy at E = 0.0 V is 78.8 kJ/mol. This value indicates chemisorption of the inhibitor on the electrode surface, which occurs due to the oxygen atoms of carboxyl groups. The thickness of the adsorbed layer, determined by ellipsometry methods, is ≈ 0.3 nm, which indicates a flat arrangement of teraphthal on the surface.

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