Study of the effectiveness of fatty acid amides used as inhibitors of atmospheric corrosion

The use of anticorrosive agents increases the service life, reliability and safety of agricultural machinery.

The shortage of domestic inhibitors is caused by the lack of a scientifically sound concept for their production, as well as a lack of raw materials. The authors have developed a technology for the production of fatty acid amides (FAA) from triglycerides of vegetable, animal origin or fat-containing waste. The purpose of this study was to evaluate the effectiveness of fatty acid amide used as an inhibitor of atmospheric corrosion. A comparative assessment of the protective effectiveness of FAA was determined in accordance with GOST 9.054-75 at elevated values of relative humidity and air temperature, exposure to salt mist, with constant immersion in an electrolyte and exposure to the hydrobromic acid. The authors compared preservation compositions based on FAA 16%, Avtokon LS, Kormin 50%, Rosoil 700, Kormin 30%. The protective properties of the products were studied on samples with dimensions of 50 × 50 mm made of steel grade St3. After the tests, the appearance of the samples was evaluated before and after removing the lubricant. According to the results of each experiment, the protective properties of the preservation compounds were arranged in the decreasing order. According to the results of four experiments, each composition was assigned a score characterizing the total assessment of the protective ability of the compositions according to GOST 9.407-2015. As a result of the study, the relationship between the effectiveness of preservative oils and the composition and amount of the inhibitor has been established. The effectiveness of fatty acid amides used as an inhibitor of atmospheric corrosion has been proven. Preservation oil made using 16% FAA exceeds the protective effect of analogue products in 1.1 to 2.0 times.

1. Severny A.E. et al. Improving the protective ability of conservation compositions. World of Transport and Technological Machines. 2009;3:44-47. (In Russ.)

2. Vigdorovich V.I., Tsygankova L.E., Emelianenko A.M. et al. Corrosion and kinetics of electrode processes on steel with a hydrophobic coating in a chloride medium and with the addition of hydrogen sulfide. Korroziya: Materialy, Zashchita. 2020;2:21-26. (In Russ.)

3. Gaidar S.M., Nizamov R.K., Prokhorenkov V.D., Kuznetsova E.G. The innovative conservation compounds for corrosion protection of agricultural equipment. Machinery and Equipment for Rural Area. 2012;11:40-43. (In Russ.)

4. Gaidar S.M., Pikina A.M., Lapsar O.M., Golubev I.G. Development of technology for processing fat waste into technical products. Machinery and Equipment for Rural Area. 2023;3(309):32-35. (In Russ.)

5. Gaidar S.M., Pikina A.M., Sergeeva N.A., Lapsar’, O.M. Technology for producing anticorrosive materials from fat-containing waste. Agricultural Engineering (Moscow). 2024;26(2):57-64. https://doi.org/10.26897/2687-1149-2024-2-57-64

6. Method for producing mono- and diethanolamides of fatty acids: patent for invention RU2787477 C1; IPC C07C233/18, C07C231/02 / S.M. Gaidar, V.E. Konoplev, O.M. Lapsar, T.I. Balkova, A.M. Pikina, I.A. Posunko. Application No. 2022109878 dated 04/13/2022 (In Russ.)

7. Verolainen N.V., Voronchikhina L.I. Surface activity and surfactants. Vestnik Tverskogo Gosudarstvennogo Universiteta. Series: Chemistry. 2009;9:4-19. (In Russ.)

8. Mansuraeva L.M., Yusupova I.I., Bulaev S.A. Surfactants: properties and application. Vestnik Magistratury. 2022;2-1(125):30-35. (In Russ.)

9. Karelina M.Yu., Dmitrevskij A.L., Laguzin A.B. Influence of fluoro-surfactant concentration on the quality of protective molecular film. Gruzovik. 2018;7:16-20. (In Russ.)

10. Karelina M.Yu. Conception of creating corrosion inhibitors with usage of nanotechnological approaches. Vestnik Moskovskogo avtomobilno-dorozhnogo gosudarstvennogo tekhnicheskogo universiteta (MADI). 2015;3:8-11. (In Russ.)

11. Emelyanov A.A., Gaidar S.M., Balkova T.I. Investigation of the inhibitory effect of surfactants by method of polarization measurements. Elektrometallurgiya. 2023;8:30-40. (In Russ.)