Anti-corrosion protection of some metals with zinc-containing oil coatings

• L.G. Knyazeva^1,2,3, L.E. Tsygankova², A.V. Dorokhov^1,2, N.A. Kuryato⁴, V.A. Kuryato^1,2 and N.V. Shel³

¹ All-Russian Scientific Research Institute of Use of Machinery and Oil Products in Agriculture, Novo-Rubezhnyi per., 28, 392022 Tambov, Russia
² Derzhavin State University, ul. Internatsionalnaya, 33, 392000 Tambov, Russia
³ Tambov State Technical University, ul. Sovetskaya, 106, 392000 Tambov, Russia
⁴ Joint Stock Company “Pigment”, ul. Montazhnikov, 1, 392000 Tambov, Russia

Abstract: The work is dedicated to estimating protective ability of coatings on steel, copper and brass with preservative materials based on zinc-filled waste motor oil, modified with additives of paraffin, stearic acid or myristic acid. The compositions studied wet the steel surface with a contact angle of θ≤90°, they themselves are wetted by water with θ<80°, and are characterized by low surface tension (σ<22 mN/m). The temperature dependence of the kinematic viscosity of the oil compositions studied is described by the Reynolds–Filonov formula in the range of 20–60°C. The protective effect (Z, %) of the coatings studied on steel and copper calculated on base of polarization curves at short-term exposure in a 0.5 M NaCl solution, is close to 100%. A similarly high Z value was shown to be for composites with myristic acid additives in long-term corrosion tests (336 hours) of copper, brass, and steel in a 0.5 M NaCl solution, as well as steel in a heat and humidity chamber (996 hours). In salt spray chamber tests, coatings with zinc filler and myristic acid on all three metals demonstrated the best protection. These same coatings were proved to be the most effective under natural conditions during three-month corrosion tests of steel.

Keywords: steel, copper, brass, combined corrosion inhibitor, oil, protective efficiency, atmospheric corrosion

Int. J. Corros. Scale Inhib., 2026, 15, no. 3, 230-243
doi: 10.17675/2305-6894-2026-15-3-9

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