Protection of copper and MNZh5-1 alloy by sodium salt of methylenesuccinic acid in an aqueous chloride solution
https://doi.org/10.61852/2949-3412-2024-2-3-68-81
Abstract
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.
About the Authors
M. O. Agafonkina
ФГБУН Институт физической химии и электрохимии им.А.Н. Фрумкина РАН
Russian Federation
Russian Federation
I. A. Kuznetsov
ФГБУН Институт физической химии и электрохимии им.А.Н. Фрумкина РАН
Russian Federation
Russian Federation
N. P. Andreeva
ФГБУН Институт физической химии и электрохимии им.А.Н. Фрумкина РАН
Russian Federation
Russian Federation
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Review
For citations:
Agafonkina M.O., Kuznetsov I.A., Andreeva N.P. Protection of copper and MNZh5-1 alloy by sodium salt of methylenesuccinic acid in an aqueous chloride solution. Title in english. 2024;(3):68-81. (In Russ.) https://doi.org/10.61852/2949-3412-2024-2-3-68-81
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