Protection of steel against atmospheric corrosion by oil compositions with paraffin

• L.G. Knyazeva^1,2,3, L.E. Tsygankova¹, N.A. Kur’yato², V.A. Kur’yato¹, A.V. Dorokhov² and A.A. Uryadnikov¹

¹ Derzhavin State University, ul. Internatsionalnaya, 33, 392000 Tambov, Russian Federation
² All-Russian Scientific Research Institute of Use of Machinery and Oil Products in Agriculture, Novo-Rubezhnyi per., 28, 392022 Tambov, Russian Federation
³ Tambov State Technical University, ul. Sovetskaya, 106, 392000, Tambov, Russian Federation

Abstract: The physicochemical and protective properties of oil compositions based on M10G₂(k) commercial motor and waste motor oils (WMO) with the addition of 3–10 wt.% paraffin P-2 were studied. The values of the contact angles of wetting the compositions with water (Θ1), surface tension (σ), and adhesion work (Wa) increase with increasing paraffin concentration. The Wa values of WMO-based compositions with paraffin are higher than those of M10G2(k)-based compositions. This results in higher coating thicknesses on steel surface and protective efficiency values (Z%) of WMO-based compositions. At a concentration of 10 wt.% P-2 paraffin, the protective efficiency of the latter is 94% in a 0.5 M NaCl solution (exposure time is 336 h), 100% in a thermal moisture chamber (40 days) and in natural conditions for three and six months. The protective effect of coatings based on commercial oil is 24% lower in a chloride solution and 5% lower in a thermal moisture chamber. Polarization measurements have shown that oil compositions with paraffin cause a slowdown in the anodic process on steel.

Keywords: carbon steel, corrosion, inhibition, oil compositions, paraffin, protective efficiency

Int. J. Corros. Scale Inhib., 2025, 14, no. 1, 169-178
doi: 10.17675/2305-6894-2025-14-1-10

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