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DOI: 10.15507/2658-4123.036.202602.416-432

UDK 631.3.02

Tetraborophosphate Inhibitors for Protecting Agricultural Machinery Components Against Corrosion during Off-Season Storage

Ivan V. Fadeev
Dr.Sci. (Eng.), Professor, Head of Mechanical Engineering Chair, Chuvash I. Yakovlev State Pedagogical University (38 K. Marksa St., Cheboksary 428003, Russian Federation), ORCID: https://orcid.org/0000-0002-5863-1812, Researcher ID: B-8856-2019, This email address is being protected from spambots. You need JavaScript enabled to view it.

Ivan A. Uspensky
Dr.Sci. (Eng.), Professor, Head of Technical Operation of Transport Chair, Ryazan State Agrotechnological University named after P. A. Kostychev (1 Kostycheva St., Ryazan 390044, Russian Federation), ORCID: https://orcid.org/0000-0002-4343-0444, Researcher ID: B-7990-2019, This email address is being protected from spambots. You need JavaScript enabled to view it.

Mikhail N. Chatkin
Dr.Sci. (Eng.), Professor, Professor of the Leshchankin Chair of Mobile Power Tools and Agricultural Machinery, National Research Mordovia State University (68 Bolshevistskaya St., Saransk 430005, Russian Federation), ORCID: https://orcid.org/0000-0002-3758-7066, Researcher ID: O-7004-2018, This email address is being protected from spambots. You need JavaScript enabled to view it.

Ivan A. Yukhin
Dr.Sci. (Eng.), Professor, Head of the Department of Automotive and Tractor Engineering and Thermal Power Engineering, Ryazan State Agrotechnological University named after P. A. Kostychev (1 Kostycheva St., Ryazan 390044, Russian Federation), ORCID: https://orcid.org/0000-0002-3822-0928, Researcher ID: Q-8188-2017, This email address is being protected from spambots. You need JavaScript enabled to view it.

Stanislav R. Petrov
Master's student, Chuvash State Agrarian University (29 K. Marksa St., Cheboksary 428003, Russian Federation), ORCID: https://orcid.org/0009-0006-0639-4274, Researcher ID: OMM-3236-2025, This email address is being protected from spambots. You need JavaScript enabled to view it.

Alexander S. Kazarin
Independent Researcher, ORCID: https://orcid.org/0000-0003-0507-8563, Researcher ID: ONJ-2793-2025, This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract
Introduction. The problem of corrosion damage to the working bodies of agricultural machinery during off-season storage remains a pressing one due to the ineffectiveness of traditional preservation methods. Solving this problem is necessary to reduce material losses, increase the service lifetime of equipment, and ensure uninterrupted operation during seasonal fieldwork.
Aim of the Study. The study is aimed at the theoretical and experimental substantiation for the use of alkali metal and ammonium tetraboron phosphates as highly effective corrosion inhibitors for protecting steel 65G.
Materials and Methods. The object of the study was steel 65G, which is used to manufacture the working bodies of agricultural machines. The inhibitory effect of the synthesized lithium, sodium, potassium, and ammonium tetraborophosphates was assessed using the gravimetric (according to GOST 9.908–85, VLA-200 g-M scales), electrochemical (potentiostat P-5848, three-electrode cell), and corrosion fatigue (2·10₆ cycles) methods in a 3% NaCl solution.
Results. When potassium tetraborophosphate was added to a 3% NaCl solution, the corrosion rate of steel 65G was 4.2·10_–3g/(m2·h), while it was 44.6·10_–3 g/(m₂·h) in a solution without an inhibitor. According to electrochemical measurement data, the steel corrosion potential in the solution with potassium tetraborophosphate changed from −0.42 to −0.16 V. In the cleaning solution MS-8 with the addition of potassium tetraborophosphate (5 kg/m₃) at a temperature of 60 °C and a washing period of 6 minutes, the surface cleaning degree reached 88.9%, and the contact angle was 25°. In carrying out corrosion fatigue tests based on 2·10₆ cycles, the steel fatigue limit in an aggressive environment with potassium tetraborophosphate increased by 6.5 MPa compared to a solution without an inhibitor.
Discussion and Conclusion. The results obtained allow us to recommend the studied tetraboron phosphate compounds, particularly potassium tetraboron phosphate, as effective detergentpassivating additives to aqueous cleaning solutions and to corrosion protection compounds for agricultural machinery during off-season storage. This will ensure technological effectiveness, environmental friendliness, and increased lifetime of the equipment.

Keywords: corrosion inhibitors, tetraborophosphates, 65G steel, off-season storage, synthetic detergents, corrosion resistance, contact angle, corrosion fatigue

Conflict of interest: The authors declare that there is no conflict of interest.

For citation: Fadeev I.V., Uspensky I.A., Chatkin M.N., Yukhin I.A., Petrov S.R., Kazarin A.S. Tetraborophosphate Inhibitors for Protecting Agricultural Machinery Components Against Corrosion during Off-Season Storage. Engineering Technologies and Systems. 2026;36(2):416–432. https://doi.org/10.15507/2658-4123.26362.416-432

Authors contribution:
I. V. Fadeev – oversight and leadership responsibility for the study activity planning and execu ting, including mentorship external to the core team; formulating the study ideas, aims and objectives.
I. A. Uspensky – developing the study methodology; conducting the study, specifically performing the experiments, or collecting data.
M. N. Chatkin – developing the study methodology; conducting the study, specifically performing the experiments, or collecting data.
I. A. Yukhin – conducting the study, specifically performing the experiments, or collecting data.
S. R. Petrov – conducting the study, specifically performing the experiments, or collecting data.
A. S. Kazarin – conducting the study, specifically performing the experiments, or collecting data.

All authors have read and approved the final manuscript.

Submitted 24.10.2025;
revised 18.11.2025;
accepted 24.11.2025

REFERENCES

This work is licensed under a Creative Commons Attribution 4.0 License.