cpomaemКоррозия: защита материалов и методы исследованийTitle in englishИФХЭ РАН10.61852/2949-3412-2023-1-4-114-130cpomaem-32Research ArticleСтатьиЗащита меди и сплава МНЖ5-1 от коррозии солями янтарной и алкенилянтарных кислот в хлоридном раствореProtection of copper and MNZh5-1 alloy from corrosion by succency and alkenylsuction acids salts in chloride solutionКузнецовЮ. И.KuznetsovYu. I.

119071

Ленинский проспект, 31, корп. 4

Москва

119071

Leninskii pr. 31

Moscow

anarenen@gmail.comКузнецовИ. А.KuznetsovI. A.

119071

Ленинский проспект, 31, корп. 4

Москва

119071

Leninskii pr. 31

Moscow

АндрееваН. П.AndreevaN. P.

119071

Ленинский проспект, 31, корп. 4

Москва

119071

Leninskii pr. 31

Moscow

АгафонкинаМ. О.AgafonkinaM. O.

119071

Ленинский проспект, 31, корп. 4

Москва

119071

Leninskii pr. 31

Moscow

Институт физической химии и электрохимии им. А.Н. Фрумкина РАНРоссияA.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of SciencesRussian Federation20230501202404114130Copyright © Кузнецов Ю.И., Кузнецов И.А., Андреева Н.П., Агафонкина М.О., 20242024Кузнецов Ю.И., Кузнецов И.А., Андреева Н.П., Агафонкина М.О.Kuznetsov Y.I., Kuznetsov I.A., 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/32

   Изучено адсорбционное, защитное и пассивирующее действие натриевых солей янтарной, итаконовой и композиции алкенилянтарных кислот на окисленной поверхности меди и медно-никелевого сплава МНЖ5-1 в нейтральном хлоридном растворе. Величины (-Δ𝐺0𝑎) ) на меди для сукцината и итаконата натрия, а также смесей натриевых солей KAП-25, соответственно, составляют 77,4 и 65,4 кДж/моль. На сплаве для сукцината и итаконата натрия величины свободных энергий адсорбции (-Δ𝐺0𝑎) =89,3 и 58,3 кДж/моль, соответственно. Такие значения (-Δ𝐺0𝑎) предполагают хемосорбционное взаимодействие этих органических анионов с окисленной поверхностью меди и сплава. Коррозионные испытания в хлоридном растворе меди и сплава в течение 7 суток показали, что лучшим ингибитором коррозии является композиция KAП-25 с натриевой солью меркаптобензтиазола.

   The adsorption, protective and passivating effect of sodium salts of succinic, itaconic and a blend of alkenylsuccinic acids (SKAP-25) on the oxidized surface of copper and copper–nickel alloy MNZh5-1 in neutral buffer and chloride solutions was studied. The adsorption of sodium succinate and itaconate is adequately described by the full Temkin isotherm equation with the value of the free energy of adsorption (-Δ𝐺0𝑎) on oxidized copper at E=0.0 V being 77.4 and 65.4 kJ/mol, respectively. The values of (-Δ𝐺0𝑎) for these corrosion inhibitors on the preoxidized MNZh5-1 alloy electrode are 89.3 and 58.3 kJ/mol, respectively. Such values of (-Δ𝐺0𝑎)  suggest chemisorption interaction of these organic anions with the oxidized surface of copper and its alloy. Corrosion tests of copper and alloy MNZh5-1 in solutions for 7 days showed that a formulation of SKAP with the sodium salt of 2-mercaptobenzothiazole.

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