Background The late stages of oil fields development include the technologies increasing oil recovery, and therefore oil production is carried out in conditions of its high water cut, which leads to increased equipment corrosion at production, preparation, storage, transport and processing facilities oil. Technological fluids high aggressiveness is associated with the presence of dissolved gases, mechanical impurities, salt ions, water-soluble naphthenic and mineral acids and bases, as well as microorganisms whose life-activity products cause active biocorrosion of the metal. According to statistics of oil and gas equipment failures and destruction, it can be noted that corrosion of metal and the formation of its products, contributing to the transported raw materials contamination, represent the main complications that significantly reduce its resource. Aims and Objectives Impact assessment of corrosive environment pH on the pitting corrosion development in formation water. Results Studies have shown that an increase in the pH of a water-salt solution saturated with chlorine ions promotes the substantial shift of the aluminum alloy surface stationary electrode potential (up to 900 mV) in the negative direction. This contributes to the cathodic corrosion reactions enhancement and the breakdown of passive films. Passive film breakdown causes the pitting corrosion development. According to the forecast, if the pH is increased to 14, the corrosion rate can be increased to 17 mm/year. Characteristics and composition of alkaline salt condensate require constant monitoring. With significant local increase in the condensate pH, it is necessary to protect the aluminum alloy surface with paint and varnish. Taking into account the study results and following the recommendations made will significantly increase the life of pontoons, reservoirs and other structures during their operation in the oil and gas industry.