The main methods of corrosion protection of equipment and metal structures of offshore drilling platforms are considered. The corrosion resistance of the high-strength 1980T1 aluminium alloy used for the manufacture of the riser in seawater and drilling mud, the effectiveness of its protection with zinc-rich coatings using the methods of polarization resistance, potentiometry, as well as appearance assessment studied. In seawater at 20 and 40 °C, alloy 1980T1 refers to resistant materials – 3-4 (6 grade according to GOST 5272- 90), intense pitting formation is observed, in drilling mud the corrosion rate (Km) increases more than 10 times refer to seawater (low-resistance, 6 grade), which is due to the alkaline nature of the medium. There is intense continuous corrosion, large pitting, ulcers on the seam and its border. In seawater at 20 °C, the Km of aluminium and coatings are comparable. In the drilling mud at 20 °C, the coatings provide a 2,5…4-time reduction in Km. After 30 days of exposure in seawater and drilling mud at 20 °C, the zinc-polyurethane coating detached to 40…70%, intense pitting of base observed. Bubbles all over the surface of zinc-epoxy coating observed. Zincsilicate and zinc-polyurethanalkyde coating with a high concentration of zinc had only small delamination in the weld area. In seawater at 20…40 °С and drilling mud at 20 °C zinc-silicate coating has the greatest tread capacity, the zinc-polyurethane, zinc-polyurethanalkyde and zinc-epoxy coatings are insignificant. Additional protection of welds and pipe surfaces in seawater achieved using insulated, metallized, protective coatings and cathode protection, in drilling mud it is also necessary to study the possibility of pH reduction and the use of effective corrosion inhibitors.

The problem of internal corrosion is an urgent problem in the transportation of produced products with the presence of corrosive-aggressive components through gas pipelines. The presence of CO2 or H2S in the produced gas in combination with the presence of condensation water, as well as a number of other factors, stimulates the intensive development of carbon dioxide or hydrogen sulfide corrosion of a local nature. To determine the limiting rates of local corrosion, corrosion tests were performed under conditions of moisture condensation, which occurs when a temperature gradient occurs and the transported gas is rapidly cooled. A study was carried out to assess the influence of the main operational factors on corrosion processes during moisture condensation on the inner surface of the gas pipeline: humidity, temperature, type of steel, the presence of a weld and the presence of alcohol, monoethylene glycol and acidic environments. It has been established that many of the above corrosion parameters accelerate local corrosion of carbon and low alloy steels, the development rate of which reaches up to several mm/year. It has been determined that the rate of development of corrosion processes during the condensation of water-glycol and water-alcohol solutions depends on the amount and composition of the liquid condensing on the metal surface. High-alloy steel 12X18H10T (with 18% Cr) showed resistance to corrosion conditions during moisture con densation

This article presents the results of research in the field of synthesis of amino esters obtained on the basis of mono, di, triethanolamine and synthetic petroleum acid in a molar ratio of 1:1.The structure and structure of the obtained substances were confirmed by IR spectroscopy. The inhibitor-bactericidal effect of amino esters on the corrosion process has been studied. The inhibitory effect of the synthesized amino esters on CO2 steel corrosion at concentrations of 25, 50, and 100 mg/L was studied. Samples T-1, T-2, T-3 at a concentration of 25 mg/l for 20 hours showed an inhibitory effect of 40,36…74,15%, respectively, at a concentration of 50 mg/l, respectively 79,96…92,04 %, at a concentration of 100 mg/l, respectively, 98,09…99,59%. In order to study the antimicrobial activity of the obtained amino esters, their solutions were prepared in various media (isopropyl alcohol 60%) at five different concentrations (5; 50; 500; 600; 700 mg/l) and their effect on the vital activity of sulfate-reducing bacteria (SRB) was studied at 30…32 °C for 15 days. It has been established that at a concentration of 600 mg/l, the synthesized amino esters ex hibit a 95,2…100% bactericidal effect, and at a concentration of 700 mg/l, they exhibit a 100% bactericidal effect, completely suppressing the vital activity of bacteria. The synthesized complexes exhibit a higher bactericid al effect even at low concentrations. Thus, the bactericidal and CO2-corrosion-inhibiting properties of amino esters synthesized on the basis of synthetic petroleum acid obtained in the process of aerobic oxidation of paraffin-naphthenic hydrocarbons isolated from the diesel fraction (boiling range 190…330 °C) in the presence of transition-metal–modified nanosized γ-Al2O3 catalyst, and ethanolamines.