Protection of copper against corrosion in neutral media by dicarboxylic acid salts

Kuznetsov, Y.I.; Kuznetsov, I.A.; Vershok, D.B.

Авторы: Kuznetsov Yu I., Kuznetsov I.A., Vershok D.B.
Журнал: International Journal of Corrosion and Scale Inhibition
Том: 8
Номер: 4
Год издания: 2019
Издательство: Некоммерческое партнерство коррозионистов "Вакор"
Местоположение издательства: Москва
Первая страница: 1022
Последняя страница: 1034
DOI: 10.17675/2305-6894-2019-8-4-13
Аннотация: Sodium succinate and a mixture of alkenylsuccinic sodium salts with the number of carbon atoms in the alkenyl nc = 12–15 (SKAP-25) were studied as copper corrosion inhibitors (CI). It was shown that sodium succinate, despite the high hydrophilicity of its anion, can be an inhibitor of copper anodic dissolution in borate buffer (pH 7.4) containing 10 mmol NaCl. It decreases the value of passivation current density ip and increases the potential of local depassivation Eld. More hydrophobic succinate derivatives, SKAP-25, even more clearly show the properties of copper CI, decreasing ip and significantly increasing Eld in the same solution at lower concentrations, Cin ≥ 0.17 mmol/L. However, comparison of copper anodic polarization curves obtained in a solution of more hydrophobic sodium tridecanoate (nc = 12) and SKAP-25 showed better alkylcarboxylate efficiency in stabilizing the passive state of copper. In this regard, the SKAP-25 anions are closer to the anions of the known CI, sodium oleate, which also contains a double bond. The efficiency of copper passivation by aqueous solutions of SKAP-25, sodium oleate and sodium tridecanoate in a humid atmosphere with daily condensation of moisture on the samples is compared. In the case where corrosive chlorides are absent, treatment with SKAP-25 turned out to be more effective. However, if after copper passivation, samples were immersed for 10 s in water containing 1 g/L NaCl, the protective properties of SKAP-25 became weaker than those of sodium tridecanoate. In order to enhance copper protection by SKAP-25 anions in the presence of chlorides, we studied the behavior of copper by electrochemical impedance spectroscopy (EIS) in 3.5% NaCl solution, without and with addition of SKAP-25 and 2-mercaptobenzothiazole sodium salt (S2-MBT) whose protective effect is due to the formation of a sparingly soluble complex with Cu(I). It was shown that very small additives of S2-MBT sharply enhanced the protective effect of SKAP-25, moreover, a blend of these CIs can be more effective than S2-MBT itself, which is poorly soluble in neutral media. The efficiency criterion is the S2-MBT coating resistance value, which is calculated from the selected equivalent electrical circuit.
Добавил в систему: Вершок Дмитрий Борисович

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Protection of copper against corrosion in neutral media by dicarboxylic acid saltsстатья

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