Ways to improve the anticorrosive properties of motor oils used in vehicles

Zebo Alimova,Ravshanjon Akhmatjanov,Nargiza Kholikova,Kamola Karimova,D Bazarov

doi:10.1051/e3sconf/202126405004

Abstract

In recent years, increased requirements for protective properties have been imposed on petroleum oils for various purposes. One of the functions of the oil is to protect the surface of parts from corrosion. Corrosion becomes especially intense when the engine is operated in hot, humid climates. In this case, oil plays a double role: on the one hand, it protects the surfaces of parts from the aggressive influence of the external environment; on the other hand, the oil itself is corrosive due to the presence of corrosive substances in it. Corrosion is especially intensified after the engine is stopped. When it cools, moisture condenses on the parts, the lubricating oil, flowing down from the lubricated surface, cannot protect the metal from corrosion. The reason for the corrosive properties of oils is that they contain organic and inorganic acid peroxides and other oxidation products and sulfur compounds, alkalis, and water. The purpose of this work is to study and improve the anti-corrosion properties of lubricants. With an increase in temperature, the combined action of oxygen in the air and water present in the lubricating oil causes rusting of the crankshaft, liner walls, cylinders of the internal combustion engine. We have studied anticorrosive additives as an additive to improve the anti-corrosion properties of oils. Dialkylphenyl orthophosphoric acid additive was used as such additives. The anticorrosive activity of these substances is related to their ability to orient themselves on the oil-water surface so that hydrophilic groups are firmly bound to water while the hydrocarbon radical remains in the oil.

Highlights

In recent years, increased requirements for protective properties have been imposed on petroleum oils for various purposes
The displacement of water from the metal surface can occur as a result of its binding: due to solvation by metal cations, the inclusion of hydrophilic additives in the hydration shells, and solubilization or emulsification and stabilization in the form of water - oil product emulsions
The anticorrosive activity of these additives is related to their ability to orient themselves on the oil-water surface so that hydrophilic groups are firmly bound to water while the hydrocarbon radical remains in the oil

Summary

Introduction

In recent years, increased requirements for protective properties have been imposed on petroleum oils for various purposes. One of the functions of the oil is to protect the surface of parts from corrosion. Petroleum-based oils are not capable of long-term protection of metals from electrochemical corrosion. Corrosion can be related to external and internal factors. The main internal factor is the chemical composition of the oil. Active sulfur compounds directly cause corrosion of metals; they must be removed during the refining of oil products. The content of active sulfur compounds is determined by a sample on a copper plate (3 hours at 50 ° C)

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