PROTECTIVE EFFECTIVENESS OF OIL COMPOSITIONS WITH PARAFFIN WAX

The effectiveness of compositions based on fresh M10G2k and used motor oil (MMO) with the addition of paraffin 1-10 wt. % for the protection of carbon steel was investigated in this work. Preservative compositions were prepared by dissolving paraffin in oils with heating. The protective coating on the metal was formed during the day. Kinematic viscosity was measured by the Brookfield method on a rotational viscometer. Studies have shown that paraffin has a thickening effect. Empirical equations were obtained, which are a special case of the Reynolds-Filonov equation, describing the viscosity-temperature dependences for compositions based on fresh and used engine oil and paraffin with a high reliability of linear approximation in the temperature range of 20 - 60 0C. The resulting equations make it possible to determine the kinematic viscosity of the compositions at various paraffin concentrations in a given temperature range. Electrochemical studies have shown that the introduction of paraffin increases the protective effectiveness of both fresh and used engine oil. The protective effectiveness of compositions based on used engine oil is higher. With an increase in the concentration of paraffin, the protective effectiveness of the compositions increases. The best results were obtained for compositions of 10 wt. % paraffin in MMO. Gravimetric studies confirmed the obtained results. Some discrepancies in the values obtained by gravimetric and electrochemical methods are explained by the different duration of the experiments.