cpomaemКоррозия: защита материалов и методы исследованийTitle in englishИФХЭ РАН10.61852/2949-3412-2024-2-2-81-94cpomaem-57Research ArticleСтатьиАдсорбция анионов 2-алкилмалоновых кислот на меди и защита ее от коррозии в хлоридных растворахPossibility of protecting copper from corrosion in chloride solutions with salts of 2-alkylmalonic acidsКузнецовИ. А.KuznetsovI. A.

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

Leninsky pr. 31, 119071 Moscow

АндрееваН. П.AndreevaN. P.

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

Leninsky pr. 31, 119071 Moscow

АгафонкинаМ. О.AgafonkinaM. O.

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

Leninsky pr. 31, 119071 Moscow

agafonkina@inbox.ruИнститут физической химии и электрохимии им. А.Н. Фрумкина Российской академии наук (ИФХЭ РАН)РоссияA.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of SciencesRussian Federation202425062024028194Copyright © Кузнецов И.А., Андреева Н.П., Агафонкина М.О., 20242024Кузнецов И.А., Андреева Н.П., Агафонкина М.О.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/57

Адсорбция на окисленной поверхности меди из боратного буфера (pH 7,4), анионов солей алкилмалоновых кислот (АМК), с алкилами, содержащими разное число углеродных атомов, nC, измеренная эллипсометрическим методом при Е = 0,0 В адекватно описывается полным уравнением изотермы Темкина. Величина стандартной свободной энергии адсорбции (–∆G0a ) для их анионов составляет 47,7 кДж/моль для малоната и достигает 83,9 кДж/моль для нонилмалоната натрия. Это свидетельствует о химической природе адсорбции. Коррозионное поведение меди в водных растворах натриевых солей изучено методами поляризационных и коррозионных испытаний. Добавление 2 ммоль/л солей АМК в боратный буфер, содержащий 10 ммоль/л NaCl, замедляет анодное растворение меди, увеличивая ее потенциал локальной депассивации (Епт). Чем длиннее алкил в ингибиторе, тем более выражены его пассивационные эффекты. Семидневные коррозионные испытания меди в 10 ммоль/л растворе NaCl, проведенные в присутствии солей алкилмалоновых кислот, показали, что защитный эффект возрастает с увеличением, как концентрации ингибитора Cин, так и nC. В диапазоне Cин = 0,5–3 ммоль/л степень защиты меди анионами малоновой кислоты увеличивается с 26 до 76%, а нонилмалоновой кислоты с 66 до 95%, доказывает эффективность хемосорбции при защите от коррозии меди нонилмалоната натрия.

The electrochemical and corrosion behavior of copper in aqueous solutions of sodium salts of alkylmalonic acids with alkyl lengths of nС = 0, 2, 4, 7 and 9 was studied by ellipsometry, potentiodynamic polarization and corrosion tests. Addition of alkylmalonic acid salts at a concentration of Cinh = 0.002 mol/L to borate buffer solution (pH 7.4) containing 0.01 mol/L NaCl slows down the anodic dissolution of copper, increases its local depassivation potential and inhibits the cathodic oxygen reduction. The greater the alkyl length of the inhibitor, the more expressed these effects are. It has been shown that the adsorption strength of alkylmalonate increases with increasing alkyl length and is adequately described by the full Temkin isotherm equation. The standard free energy of adsorption (–∆G0a) of these anions on the oxidized copper surface at E= 0.0 V is 47.7 kJ/mol for malonic acid and 83.9 kJ/mol for nonylmalonic acid, which suggests a chemical nature of adsorption. Seven-day corrosion tests of copper in 0.01 mol/L NaCl solution performed in the presence of alkylmalonic acid salts with n = 0, 2, 4, 7 and 9 have shown that the protective effect increases both with increasing Cinh and with increasing alkyl length. In the Cinh range of 0.5–3 mmol/L the degree of copper protection by malonic acid anion increases from 26 to 76% and by nonylmalonic acid from 66 to 95% which confirms the highest efficiency of sodium nonylmalonate among the studied dicarboxylates at copper and its alloy corrosion inhibition.

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