Abstract
In today's conditions, the effective and safe functioning of the oil production and oil refining industry is responsible for the economic and environmental security of the state. Oil-containing environments are characterized by increased aggressiveness towards metals due to the presence of water, hydrogen sulfide, organic acids, chlorides and other components. Under these conditions, corrosion can have an electrochemical, chemical or biological basis, which requires a comprehensive approach to its prevention.
This work analyzes the influence of pH on the aggressiveness of corrosion of mineralized water-oil environments towards carbon steel St20. The dependence of the corrosion rate in NaCl solutions with concentrations of 30 and 100 g/dm³, with the addition of oil from the Kremenchuk field, at variable pH values (5–9) and at room temperature was established by experiment. It was found that the presence of oil reduces the corrosion rate due to the formation of an insulating oil film by 2-2.5 times, but the corrosion rate was at the level of 0.01-0.02 g/(m2h). At the same time, for such complex media in terms of component content, no noticeable effect of pH was observed, a decrease in the corrosion rate by 20-30% was observed at a neutral pH of 6-8.