Adsorption and Protective Properties of Sodium Tridecanoate on MNZh5-1 Alloy from Aqueous Chloride Solutions
https://doi.org/10.61852/2949-3412-2026-4-2-142-153
Abstract
In this study, sodium tridecanoate (NaC13) on the surface of a copper alloy in neutral chloride solutions was studied using adsorption, polarization, and gravimetric methods. Ellipsometric measurements revealed the initial adsorption capacity of the NaCl3 anion on the oxidized alloy surface at E=0.0 V. Calculation of the obtained isotherms using the complete Temkin equation yields an adsorption free energy of 76 kJ/mol. This value indicates chemisorption of the NaC13 anion on the metal. Polarization measurements show that exposure of MNZh5-1 to an inhibited solution for 18 hours increases the local depassivation potential of MNZh5-1 positively, more strongly than in the absence of exposure. Corrosion tests in chloride solutions show that complete protection of the alloy in a 0.01 mol/L NaCl aqueous solution is observed at 6.5 mmol/L NaCl, while in a 0.001 mol/L NaCl solution, complete protection occurs at 0.95 mmol/L NaCl. Preliminary exposure of the alloy to an inhibited solution at a surface concentration required for complete protection of the alloy: up to 4.5 mmol/L NaCl in a 0.01 mol/L aqueous NaCl solution and up to 0.65 mmol/L in a 0.001 mol/L NaCl solution.
About the Authors
Yu. A. Kuzenkov
Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences
Russian Federation
Russian Federation
Leninsky prospect, 31-4, 119071 Moscow
M. O. Agafonkina
Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences
Russian Federation
Russian Federation
Leninsky prospect, 31-4, 119071 Moscow
N. P. Andreeva
Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences
Russian Federation
Russian Federation
Leninsky prospect, 31-4, 119071 Moscow
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Review
For citations:
Kuzenkov Yu.A., Agafonkina M.O., Andreeva N.P. Adsorption and Protective Properties of Sodium Tridecanoate on MNZh5-1 Alloy from Aqueous Chloride Solutions. Title in english. 2026;(2):142-153. (In Russ.) https://doi.org/10.61852/2949-3412-2026-4-2-142-153
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