Research was conducted on the corrosion products formed after five years of operation of the PMR-20 tread alloy in a tank containing water with moderate salinity, with a salt content of 234 g/l. The experiments were carried out in the laboratory of the Department of Machinery and Equipment for Oil and Gas and Chemical Industries to perform both qualitative and quantitative assessments of the chemical and ionic composition of the corrosion products. The corrosion products were collected from a functioning protector which was used for protecting a vertical cylindrical RVS-500 tank from corrosion. Photographs of the PMR-20 tread alloy before and after six years of exposure in the tank clearly show significant areas of corrosion damage, as well as the formation of corrosion product deposits on its surface. A detailed analysis of the corrosion products revealed the underlying causes of their formation and helped evaluate whether the alloy could continue to be effectively used for corrosion protection. Methods for qualitative analysis of corrosion processes were presented, such as the drop indicator method, which facilitated the accurate identification of the ionic composition of the corrosion products. The study provided insights into the efficiency of the PMR-20 tread alloy in protecting industrial equipment operating in environments with aggressive saline conditions, ensuring its reliability for extended use.
References
1. Fazlutdinov K.K., Protektornaya zashchita ot korrozii s ispol’zovaniem magniya (Protective corrosion protection using magnesium), URL: https://zctc.ru/sections/magnesium_protection
2. Kats N.G., Chemical analysis of the magnesium alloy corrosion destruction (In Russ.), Vestnik Samarskogo gosudarstvennogo tekhnicheskogo universiteta Seriya “Tekhnicheskie nauki” = Vestnik of Samara State Technical University. Technical Sciences Series, 2018, no. 1(57), pp. 173–176.
3. Kats N.G., Ibatullin I.D., Parfenova S.N., Efficiency of tread alloys for vertical steel tanks (In Russ.), Neftegazovoe delo, 2023, V. 21, no. 5, pp. 192-197,
DOI: https://doi.org/10.17122/ngdelo-2023-5-192-197
4. Kats N.G., Zhivaeva V.V., Parfenova S.N., Corrosion protection of vertical tanks (In Russ.), Stroitel’stvo neftyanykh i gazovykh skvazhin na sushe i na more, 2021,
no. 11(347), pp. 61-64, DOI: https://doi.org/10.33285/0130-3872-2021-11(347)-61-64
5. Vasil’ev S.V., Kats N.G., Parfenova S.N. et al., General characteristic and properties of produced waters (In Russ.), Stroitel’stvo neftyanykh i gazovykh skvazhin na sushe i na more, 2011, no. 12, pp. 41-42.
6. Ammosov G.S., Ivanov D.S., Ammosov A.P., The features of corrosion exhaustion of tanks resource and assessment of intensity of stress state increasing in welds
(In Russ.), Nauka i obrazovanie, 2017, no. 1, pp. 75–80.
7. Kats N.G., Konovalenko D.V., Vasil’ev S.V., The analysis of the magnesium protector alloys destruction (In Russ.), Vestnik Samarskogo gosudarstvennogo tekhnicheskogo universiteta Seriya “Tekhnicheskie nauki” = Vestnik of Samara State Technical University. Technical Sciences Series, 2015, no. 4(48), pp. 130–134.
8. Kachestvennyy khimicheskiy analiz korrozionnogo porazheniya (Qualitative chemical analysis of corrosion damage), http://delta-grup.ru/bibliot/41/278.htm
