cpomaemКоррозия: защита материалов и методы исследованийTitle in englishИФХЭ РАН10.61852/2949-3412-2024-2-3-68-81cpomaem-66Research ArticleСтатьиЗащита меди и сплава МНЖ5-1 натриевой солью метиленянтарной кислоты в водном хлоридном раствореProtection of copper and MNZh5-1 alloy by sodium salt of methylenesuccinic acid in an aqueous chloride solutionАгафонкинаМ. О.AgafonkinaM. O.

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

КузнецовИ. А.KuznetsovI. A.

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

anarenen@gmail.coАндрееваН. П.AndreevaN. P.

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

ФГБУН Институт физической химии и электрохимии им.А.Н. Фрумкина РАНРоссия202416092024036881Copyright © Агафонкина М.О., Кузнецов И.А., Андреева Н.П., 20242024Агафонкина М.О., Кузнецов И.А., Андреева Н.П.Agafonkina M.O., Kuznetsov I.A., Andreeva N.P.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.cpmrm.ru/jour/article/view/66

Изучено защитное и пассивирующее действие натриевой соли метиленянтарной кислоты (итаконовой) и её композиции с 2-меркаптобензотиазолом на окисленной поверхности меди и медного сплава МНЖ5-1 в боратном буферном растворе рН 7,4 с добавлением 0,01 М NaCl. Измерения адсорбции итаконата натрия при Е = 0,0 В показали более высокие величины свободной энергии адсорбции на меди (-∆G0a) = 65,4 кДж/моль, чем на сплаве МНЖ5-1 (-∆G0a) = 58,3 кДж/моль. Такие значения (-∆G0a) предполагают хемосорбционное взаимодействие этого органического аниона с окисленной поверхностью электрода. Коррозионные испытания меди и сплава в 0,01 М хлоридном растворе в течение 7 суток показали, что максимальная степень защиты (Z = 90–100%) наблюдается для 3 ммоль/л композиции исследуемого дикарбоксилата с натриевой солью 2-меркаптобензотиазола.

The adsorption, protective and passivating effect of the sodium salt of methylenesuccinic acid and its composition with 2-mercaptobenzothiazole on the oxidized surface of copper and copper alloy MNZh5-1 in a neutral solution has been studied. Adsorption measurements show a higher free energy of adsorption (-∆G0a) = 65,4 kJ/mol on copper than on the MNZh5-1 alloy (-∆G0a) = 58,3 kJ/mol at E = 0,0 V. These values (-∆G0a) indicate the chemisorption interaction of the organic anion with the oxidized electrode surface. Corrosion tests in a chloride solution of copper and its alloy for 7 days showed that the maximum degree of protection (Z = 90–100%) is observed for a 3 mmol/L composition of the investigated dicarboxylate with the sodium salt of 2-mercaptobenzothiazole.

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