Possibility of protecting copper from corrosion in chloride solutions with salts of 2-alkylmalonic acids
https://doi.org/10.61852/2949-3412-2024-2-2-81-94
Abstract
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.
About the Authors
I. A. Kuznetsov
A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences
Russian Federation
Russian Federation
Leninsky pr. 31, 119071 Moscow
N. P. Andreeva
A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences
Russian Federation
Russian Federation
Leninsky pr. 31, 119071 Moscow
M. O. Agafonkina
A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences
Russian Federation
Russian Federation
Leninsky pr. 31, 119071 Moscow
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For citations:
Kuznetsov I.A., Andreeva N.P., Agafonkina M.O. Possibility of protecting copper from corrosion in chloride solutions with salts of 2-alkylmalonic acids. Title in english. 2024;(2):81-94. (In Russ.) https://doi.org/10.61852/2949-3412-2024-2-2-81-94
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