620.197.3

extract of oak chips, corrosion rate, compromise corrosion potential, corrosion current, limiting diffusion current, Tafel constants.

The sharp deterioration of the ecological state of the environment is associated not only with the activities of various plants, but also with the lack of high-quality recycling of industrial waste and reliable, safe anticorrosive protection of equipment. In this regard, over the past decade, increased attention has been paid to the search for eco-friendly corrosion protection agents, in particular, through the use of waste from the woodworking, food and other industries: extracts of wood chips, natural resins, and the breakdown products of vegetable fats (technical glycerin). Therefore, the creation of so-called «Green» inhibitors is an urgent and promising task. Gravimetric and electrochemical studies, we found that technical glycerin (TG) has an anticorrosive effect on steel and aluminium in a 0.1% NaCl solution. Its effectiveness in the concentration range of 1.0–2.5 g/l is practically unchanged, the degree of protection Z is 57–67%. The inhibitory properties of TG due to its adsorption on the surface of these metals with a predominance of the energy (double-layer) component of the protective effect. The inhibitor retard both electrode reactions on steel 20 and aluminium, while reducing corrosion currents by 2–4 times. An increase in the anticorrosive properties of TG without an increase of its concentration is achieved through the use of synergistic reagents. Triethanolamine in the composition with TG did not exert an inhibitory effect, while the extract of oak chips (EO) with the ratio of TG: EO components = 3:l2 increased the degree of protection of steel 20 and aluminium to 80–82%. The protective mechanism of the created composition is somewhat different from the mechanism of the main component. The compromise potential of both metals shifts to a more negative side, the nature of the cathode and anode curves changes, in particular, the portion of the limiting diffusion current disappears. Corrosion currents decrease by ~ 8 times.

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2. Abiola O. K., Oforka N. C., Ebenso E. E., Nwinuka N. M. Eko-friendly corrosion inhibitors: The inhibitive action of Delonix Regia extract for corrosion of aluminium in acidic media. Anti-Corrosion Methods and Materials. 2007. Vol. 54. No. 4. P. 219–224.
3. Raja P. B., Seturaman M. G. Natural products as corrosion inhibitors for metals in corrosive media. Materials Letters. 2008. № 62. Р. 113–116.
4. Behpour M., Ghoreishi S. M., Rhayatkashani М., Soltani N. Green approach to corrosion inhibition of mild steel in two acidic solutions by extract of Punica granatum peel and main constituent. Materials Chem. and Phys. 2012. No. 131. P. 621–633.
5. Amitha B. E. Rani and Bharathi Bai J. Basu. Green Inhibitors for Corrosion Protection of Metals and Alloys: An Overwiew. Int. J. of Corrosion. 2012. ID380217. Р. 1–15.
6. Romanchuk V., Topilnytskiy P. Investigation of reagents with different chemical compositions of protection of oil primary refining equipment. Chemistry & Chemistry Technology. 2010. No. 4 (3). P. 231–236.
7. Slobodjan Z., Khaburskyj Ja., Ghorak Ju. Ekstrakty dubovoji kory – “zeleni” inghibitory koroziji serednjo vughlecevykh stalej u nejtraljnykh ta kyslykh seredovyshhakh. Visnyk Ternopiljsjkogho nacion. tekhn. Universytetu. 2012. No. 4 (68). P. 73–80. [In Ukraine].
8. Chyghyrynec O. E., Fatjejev Ju. F., Vorobjova V. I., Skyba M. I. Vyvchennja mekhanizmu diji izopropanoljnogho ekstraktu shrotu ripaku na atmosfernu koroziju midi. Fiz.-khim. mekhanika materialiv, 2015. No. 5. Р. 58–66. [Іn Ukraine].
9. Mobin M., Rizvi M. Inhibitory effect of xanthan gum and synergistic surfactant additivets for mild steel corrosion in 1M HCl. Carbohydrate Polymers. 2016. No. 136. Р. 384–393.
10. Quariach E. El., Paolini J., Bouklah M. Adsorption properties of Rosmarinus officinalis oil as a green corrosion inhibitors on C38 steel in 0,5M H₂SO₄. Acta Metallurgica Sinica. 2011. Vol. 23. P. 13–20.
11. Abdel-Gaber A. M., Abd-El-Nabej B. A., Khamis E., Abd-El-Khalek D. E. The natural extract as scale and corrosion inhibitor for steel surface in brine solution. Desalination. 2011. No. 278. P. 337–342.
12. De Souza F. S., Spinelli A. Caffeic acid as greeen corrosion inhibitor for mild steel. Corrosion Science. 2009. No. 51. P. 642–649.
13. Slobodjan Z. V., Maghlatjuk L. A., Kupovych R. B., Khabursjkyj Ja. M. Kompozyciji na osnovi ekstraktiv z kory ta struzhky duba – inghibitory koroziji serednjovughlecevykh stalej u vodi. Fiz.-khim. mekhanika materialiv. 2014. No. 5. P. 48–55.
14. Rozenfel'd I. L., Zhigalova K. A. Uskorennye metody korrozionnyx ispytanij metallov. Moscow: Metallurgiya, 1966. 346 p. [In Russian].
15. Frejman L. I., Makarov V. A., Bryskin I. E. Potenciostaticheskie metody v korrozionnyx issledovaniyax i elektroximicheskoj zashhite. Leningrad: Ximiya, 1972. 240 p. [In Russian].
16. Babej Ju. Y., Ratych L. V., Slobodjan Z. V., Dmytrakh Y. N. Povyshenye dolghovechnosti metallokonstrukcyj s pomoshhjju inghibitora kompleksnogho dejstvyja. Fyz.-khym. mekhanyka materyalov. 1985. No. 6. P. 51–56. [In Russian].