INVESTIGATION OF ANTI-CORROSION PROPERTIES OF DIESEL FRACTION, CONTAINING 1,3-DIPHENYLTRIAZENE

Abstract

The article considers the possibility of expanding the range of chemicals that exhibit their high anti-corrosion properties in hydrocarbons and can be used as additives to motor fuels through the use of 1,3-diphenyltriazene. This substance belongs to the class of diazocompounds and its anticorrosive properties are determined by the adsorption capacity in contact with the metal surface, due to the presence in the molecule of nitrogen-containing active groups that form a donor-acceptor (coordination) bond with the metal surface.
 Studies of anticorrosive properties were performed on metal plates (copper and steel, grade 3), located in the model environment, which consisted of straight-run diesel fraction (240-350 ° C) obtained from gas condensate with the addition of 1% of the mass. 1,3-diphenyltriazene in which was injected 0.1% of the mass. a solution of 97% acetic acid or 0.5% of the mass. aqueous solution of 10% NaCl. The anticorrosive properties of the specified model environment were studied both in static (soft) conditions at 20 ° C, periodic stirring at a speed of 100 rpm. for 90 days, and in dynamic (hard) conditions at 50 ° C, continuous stirring at a speed of 500 rpm, aeration 1.5 dm3 / min for 120 hours.
 It was found that in those samples where there was 1% of the mass. 1,3-diphenyltriazene on the surface of metal plates formed a protective film, as evidenced by the change in color of the metal plate, and the absence of signs of corrosion on the surface, as well as a slight increase in its mass (within 0.0002 ÷ 0.0003 g). In samples where there was no 1,3-diphenyltriazene corrosion rate (Km), for mild study conditions was 0.94 × 10-4 ÷ 5.16 × 10-4 g / (m2 × h), for harsh study conditions - 0.56 × 10-2 ÷ 1.07 × 10-2 g / (m2 × year).
 The approach proposed by the authors, which takes into account the complex action of several factors (temperature, mixing, aeration and the presence of corrosive agents), allows to adequately, close to the conditions that may arise during the actual operation of facilities, to assess the effectiveness of one or another chemical to protect against corrosion of metal surfaces.