Oil Compositions with Paraffin and Additive M-531 to Protect Copper from Atmospheric Corrosion

   Inhibited oil compositions are widely used for anticorrosion protection of metals from atmospheric corrosion. Compositions based on industrial I20-A, motor M10G2k, fresh and waste (WMO), oils with the addition of an imported combined corrosion inhibitor M-531, as well as domestic P-2 paraffin in an amount of 3…10 wt. % for the protection of copper was investigated in the work. The kinematic viscosity was measured by the Brookfield method on a rotational viscometer, the contact angles were measured on an Easy Drop device. Polarization measurements were carried out using an IPC-Pro MF potentiostat in the potentiodynamic mode with a potential sweep rate of 0.66 mV/s in a 0.5 M NaCl solution. Empirical equations were obtained, which are a special case of the Reynolds-Filonov equation, describing the viscosity-temperature dependences for oil compositions with a high reliability of linear approximation in the temperature range of 20…60 °C. The study of the contact angles of wetting showed that water actively wets the studied oil coatings. The maximum values of the contact angles of wetting with water of oil coatings were reached after 1 day. Protective coatings on the metal were formed during the day. According to electrochemical studies, the use of a combined imported corrosion inhibitor M-531 and domestic paraffin P-2 in oil compositions for anticorrosive protection of copper is equally effective at a concentration of 10 wt. %.

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