Study of protective and adsorption properties of dicarboxylic acid salts on zinc
https://doi.org/10.61852/2949-3412-2025-3-1-105-120
Abstract
The adsorption, protective and passivating action of sodium salts of dicarboxylic acids (succinate, itaconate, adipate and azelainate) and their compositions with 2- mercaptobenzothiazole (2-MBT) in neutral chloride solutions was studied. During the adsorption treatment of sodium succinate, itaconate and sodium azelainate on the oxidized zinc surface at the potential E = 0.2 V, adsorption isotherms were obtained with the average values of free energy adsorption 59.4, 74.3 and 73.5 kJ/mol, respectively. Polarization studies of zinc in the 0.5 mmol/L sodium succinate technology lead to spontaneous passivation of zinc, but with the development of its content and maintenance of the anodic dissolution current. Sodium itaconate, adipate and azelainate are not able to passivate zinc in the entire concentration range of the study. Corrosion tests of zinc in 0.01 M aqueous NaCl solution for 7 days showed that the best protective function is provided by a mixture of sodium adipate with 2-MBT (9:1): at Cin= 5 mmol/L, complete protection of zinc is observed for 7 days. The composition of sodium succinate+2-MBT (4:1), sodium itaconate+2-MBT (4:1) and sodium azelainate+2-MBT (9:1) at Cin = 10 mmol/L completely protects zinc from harmful effects in 0.01 M aqueous chloride solution.
About the Authors
Yu. I. Kuznetsov
A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences
Russian Federation
Russian Federation
119071, Moscow, Leninsky Prospekt, 31, bldg. 4
N. P. Andreeva
A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences
Russian Federation
Russian Federation
119071, Moscow, Leninsky Prospekt, 31, bldg. 4
M. O. Agafonkina
A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences
Russian Federation
Russian Federation
119071, Moscow, Leninsky Prospekt, 31, bldg. 4
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Review
For citations:
Kuznetsov Yu.I., Andreeva N.P., Agafonkina M.O. Study of protective and adsorption properties of dicarboxylic acid salts on zinc. Title in english. 2025;(1):105-120. (In Russ.) https://doi.org/10.61852/2949-3412-2025-3-1-105-120
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