cpomaemКоррозия: защита материалов и методы исследованийTitle in englishИФХЭ РАН10.61852/2949-3412-2025-3-1-105-120cpomaem-91Research ArticleСтатьиИсследование защитных и адсорбционных свойств солей дикарбоновых кислот на цинкеStudy of protective and adsorption properties of dicarboxylic acid salts on zincКузнецовЮ. И.KuznetsovYu. I.

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

119071, Moscow, Leninsky Prospekt, 31, bldg. 4 

АндрееваН. П.AndreevaN. P.

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

119071, Moscow, Leninsky Prospekt, 31, bldg. 4 

АгафонкинаМ. О.AgafonkinaM. O.

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

119071, Moscow, Leninsky Prospekt, 31, bldg. 4 

agafonkina@inbox.ruФедеральное государственное бюджетное учреждение науки Институт физической химии и электрохимии им. А.Н. Фрумкина Российской академии наукРоссияA.N. Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of SciencesRussian Federation20251404202501105120Copyright © Кузнецов Ю.И., Андреева Н.П., Агафонкина М.О., 20252025Кузнецов Ю.И., Андреева Н.П., Агафонкина М.О.Kuznetsov Y.I., Andreeva N.P., Agafonkina M.O.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.cpmrm.ru/jour/article/view/91

Изучено адсорбционное, защитное и пассивирующее действие натриевых солей дикарбоновых кислот (сукцината, итаконата, адипината и азелаината) и их композиций с 2-меркаптобензотиазолом (2-МБТ) в нейтральных хлоридных растворах. При адсорбционном исследовании итаконата, сукцината натрия и азелаината натрия на окисленной поверхности цинка при потенциале Е = 0,2 В получены изотермы адсорбции с величинами свободной энергии адсорбции (-DGa0) = 74,3; 59,4 и 73,5 кДж/моль, соответственно. Поляризационные исследования цинка в присутствии 0,5 ммоль/л сукцината натрия приводят к самопроизвольной пассивации цинка, но с увеличением его концентрации растет и плотность тока анодного растворения. Итаконат, адипинат и азелаинат натрия не способны пассивировать цинк во всей исследованной области концентраций. Коррозионные испытания цинка в 0,01 М NaCl водном растворе в течение 7 суток показали, что лучшей защитной способностью обладает смесь адипината натрия с 2-МБТ (9:1): при Син = 5 ммоль/л наблюдается полная защита цинка в течение 7 суток. Композиция сукцината натрия с 2-МБТ (4:1), итаконата натрия с 2- МБТ (4:1) и азелаината натрия с 2-МБТ (9:1) при Син = 10 ммоль/л полностью защищают цинк от разрушения в 0,01 М водном хлоридном растворе.

The adsorption, protective and passivating action of sodium salts of dicarboxylic acids (succinate, itaconate, adipate and azelainate) and their compositions with 2- mercaptobenzothiazole (2-MBT) in neutral chloride solutions was studied. During the adsorption treatment of sodium succinate, itaconate and sodium azelainate on the oxidized zinc surface at the potential E = 0.2 V, adsorption isotherms were obtained with the average values of free energy adsorption 59.4, 74.3 and 73.5 kJ/mol, respectively. Polarization studies of zinc in the 0.5 mmol/L sodium succinate technology lead to spontaneous passivation of zinc, but with the development of its content and maintenance of the anodic dissolution current. Sodium itaconate, adipate and azelainate are not able to passivate zinc in the entire concentration range of the study. Corrosion tests of zinc in 0.01 M aqueous NaCl solution for 7 days showed that the best protective function is provided by a mixture of sodium adipate with 2-MBT (9:1): at Cin= 5 mmol/L, complete protection of zinc is observed for 7 days. The composition of sodium succinate+2-MBT (4:1), sodium itaconate+2-MBT (4:1) and sodium azelainate+2-MBT (9:1) at Cin = 10 mmol/L completely protects zinc from harmful effects in 0.01 M aqueous chloride solution.

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