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Zinc Protection in Chloride Solutions by Antirust Additive and its Composition with 2-mercaptobenzothiazole
https://doi.org/10.31615/j.corros.prot.2025.118.4-1
Abstract
In the present work, the passivation and protective properties of the antirust additive V-15/41 and its composition with 2-mercaptobenzothiazole (2-MBT) on zinc in an aqueous solution of sodium chloride and a borate buffer solution of pH 7.4 are studied. Individually, V15/41 is capable of spontaneously passivating the zinc electrode and ennobling the local depassivation potential in a borate buffer solution with the addition of 0.01 mol/l sodium chloride. In the absence of preliminary cathodic reduction of zinc at Cinh = 4.0…6.0 mmol/l V15/41, water-soluble complex compounds of the dicarboxylate anion with surface metal cations are formed. In the case of using the composition V15/41 with 2-MBT (9:1), the protective effect also increases with an increase in its concentration. The highest passivation properties are possessed by V15/41 +2-MBT (9:1), which at 2.0 mmol/l has a protective effect of 0.10 V. The thicknesses of the forming protective layers of V15/41 and its composition from the inhibited solution were determined using the ellipsometric method. From the results of corrosion tests it follows that V15/41 at Cinh = 1 mmol/l provides a zinc protection degree Z = 44%, and with an increase in Cinh V15/41 the protection degree decreases. The combined use of V15/41 with 2-MBT (9:1) at Cinh = 4 mmol/l provides complete zinc protection against corrosion destruction for 7 days.
Keywords
zinc,
passivation,
protective effect,
degree of protection,
alkenyl succinic acid,
chloride solution
Supporting agencies: The work was supported by the Ministry of Science and Higher Education of the Russian Federation, R&D (2025-2027) «Development of the physico-chemical foundations of corrosion processes of metals and alloys and methods of their protection» (registration number125012200581-1).
About the Authors
M. O. Agafonkina
Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences (IPCE RAS)
Россия
Россия
Marina O. Agafonkina, Cand. Sci. in Chemistry, senior scientist
bld. 4, 31, Leninskiy pr., Moscow, 119071
N. P. Andreeva
Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences (IPCE RAS)
Россия
Россия
Nina P. Andreeva, Cand. Sci. in Chemistry, leading researcher
bld. 4, 31, Leninskiy pr., Moscow, 119071
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Review
For citations:
Agafonkina M.O., Andreeva N.P. Zinc Protection in Chloride Solutions by Antirust Additive and its Composition with 2-mercaptobenzothiazole. Theory and Practice of Corrosion Protection. 2025;30(4):7-15. (In Russ.) https://doi.org/10.31615/j.corros.prot.2025.118.4-1
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