ISSN 2305-6894

A study of benzotriazole and mercaptobenzothiazole as inhibiting additives to mineral oil

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1 Udmurt Federal Research Center of the Ural Branch of the Russian Academy of Sciences, 34 T. Baramzina street, 426067 Izhevsk, Russian Federation
2 Udmurt State University, 1 Universitetskaya street, 426034 Izhevsk, Russian Federation
3 Kalashnikov Izhevsk State Technical University, 7 Studencheskaya street, 426069 Izhevsk, Russian Federation

Abstract: The principal feasibility of developing protective mineral oil formulations using inhibitive additives such as 1,2,3-benzotriazole (BTA) и mercaptobenzothiazole (MBTA), well-known and available corrosion inhibitors in aqueous media, has been shown. The protective effect of these formulations was studied using a Monicor corrosimeter in a corrosive medium that simulates the condensed moisture in industrial cities. The protective effect of mineral oil formulations containing 1–5 mass% of BTA and MBTA is only exhibited in full if the layer of the formulation applied onto non-alloy steel is heated to 50–150°C. XPS studies have shown that chemisorption bonds of iron atoms with nitrogen atoms in the BTA molecule and nitrogen and sulfur atoms in the MBTA molecule are formed upon such heating (thermochemical activation). It is due to this interaction of inhibitor atoms with iron atoms on the surface of steel, which is initiated by thermochemical activation, that a dense protective layer is formed. Having measured the masses of the samples prior to and after application of the layer, we calculated the coating thickness. It proved to be ca. 100 nm, which would allow one to skip the depreservation stage after inter-operation protection of fine-mechanic equipment if the formulations studied are used.

Keywords: X-ray photoelectron spectroscopy, corrosimeter, protective anticorrosion layer, corrosion inhibitors, mercaptobenzothiazole (MBTA), benzotriazole (BTA)

Int. J. Corros. Scale Inhib., , 10, no. 3, 924-931
doi: 10.17675/2305-6894-2021-10-3-6

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