EFFECT OF INHIBITORS CONTAINING NITROGEN, SULFUR, PHOSPHORUS ON ST-20 METAL IN AGGRESSIVE ENVIRONMENTS

ABSTRACT

Production of anti-corrosion inhibitors based on local raw materials containing nitrogen, sulfur, phosphorus, soluble in gas condensates, and the practical use of products that inhibit corrosion processes in metal pipes. At the same time, research in the field of multifunctional organic composites is a priority in improving the performance properties of corrosion inhibitors and structural materials.  Obtaining compositions of corrosion inhibitors is the simplest and most convenient way to significantly increase the effectiveness of inhibitor substances and allows the use of corrosion inhibitors for these purposes. It is necessary to study the process of obtaining compositions of corrosion inhibitors based on heterocyclic compounds containing phosphorus, sulfur and nitrogen, to study the physicochemical and inhibitory properties of the resulting compositions, and to determine the optimal conditions for carrying out anti-corrosion processes. This is due to the creation of a scientific base for the creation of new anti-corrosion inhibitors, compositions and technologies for preventing metal corrosion based on secondary production products and local raw materials. The results of the research consist in obtaining corrosion inhibitors, which are important in the manufacturing industry, and are used to obtain composite materials used in various industries on an industrial scale according to the developed technological scheme.

АННОТАЦИЯ

Производство антикоррозионных ингибиторов на основе местного сырья, содержащего азот, серу, фосфор, растворимые в газовых конденсатах, и практическое применение продуктов, ингибирующих коррозионные процессы в металлических трубах. При этом исследования в области многофункциональных органических композитов являются приоритетными в улучшении эксплуатационных свойств ингибиторов коррозии и материалов относящийся к составу. Получение композиций ингибиторов коррозии является наиболее простым и удобным способом значительного повышения эффективности веществ-ингибиторов, что позволяет использовать для этих целей ингибиторы коррозии.

Необходимо изучить процесс получения композиций ингибиторов коррозии на основе гетероциклических соединений, содержащих фосфор, серу и азот, изучить физико-химические и ингибирующих свойств полученных композиций, определить оптимальных условий протекания процессов ингибирования коррозии новыми продуктами-ингибиторами. Это объясняется созданием научной базы для разработки новых ингибиторов коррозии, составов и технологий предотвращения коррозии металлов на основе вторичных продуктов производства и местного сырья.

Keywords: gas condensate, heterocyclic compounds, electrochemical, gravimetric, multifunctional, composite corrosion inhibitors.

Ключевые слова: газовый конденсат, гетероциклические соединения, электрохимический, гравиметрический, многофункциональный, композитные ингибиторы коррозии.

Introduction. Today, scientific research is being conducted in the world to create new multifunctional compositions that prevent corrosion, obtain environmentally friendly corrosion inhibitors from secondary industrial products, and use anti-corrosion agents containing phosphorus, sulfur, and nitrogen. In this regard, heterocyclic compounds containing functional groups are of special scientific and practical importance, from which highly effective anti-corrosion compositions and anti-corrosion coatings containing phosphorus, sulfur and nitrogen can be obtained. It is necessary to develop the processes of synthesis of compositions, their physico-chemical properties, as well as possible fields of application and production technologies. In recent years, the scale of sulfur gases and oil production has increased, the sulfide content in gas and oil products reaches 500 g/ml, accordingly, the metal equipment of oil production and oil refining enterprises has been seriously damaged by hydrogen sulfide corrosion.

Dissolved carbon dioxide and hydrogen sulfide have unique aggressive properties and lead to the destruction of metal structures as a result of chemical and electrochemical corrosion.  Corrosion inhibitors react with hydrogen sulfide, forming insoluble compounds on the metal surface, forming a spatial barrier [1].  Development of multi-component inhibitors on the basis of industrial waste containing phosphorus, nitrogen, sulfur, their use in water supply systems, circulating water, as well as in the oil and gas chemical industry, new corrosion-resistant coatings, water, oil, gas condensate is to create soluble inhibitor compositions. In addition, increasing the resistance of materials to aggressive environments, improving adhesion properties, increasing resistance to dynamic external influences, and improving physical and mechanical properties are important tasks. Synthesized corrosion inhibitors were simultaneously used as inhibitory properties on metals and as the main binder in the production of high-quality paint materials.

Thermophysical, thermomechanical, corrosion resistance, adhesion and tribotechnical properties of organic polymers containing phosphorus, nitrogen, sulfur, metal oxides and polymer composite materials based on them were determined.  Methods of obtaining coating materials using polyethylene polyamine, which has high resistance to external dynamic and static effects and is resistant to aggressive environments, have been developed. By studying the effectiveness of multicomponent amine-based inhibitors using electrochemical and gravimetric methods, the corrosion rate, degree of protection, and inhibition coefficient were studied.

Style and materials. Corrosion inhibitor compositions synthesized on the basis of secondary raw materials were obtained by mixing hydrogen sulfide in gas or liquid streams with alkanolamine product and croton aldehyde in a ratio of 0,5:1. Corrosion-inhibiting compositions are adapted to protect pipelines from corrosion during the passage of gases and liquids, sulfur compounds, hydrogen sulfide and mercaptans through pipelines. The results of the study of the inhibitory properties of the synthesized (IK-1, IK-2, IK-3, IK-4) inhibitors (composition of metal oxide, urea adduct, and alkanolamines) are presented Table 1.

Results and discussion. Corrosion effect of St-20 steel samples in an aggressive environment was studied based on the following GOST-9.506-87, GOST 9.505-86. [3-4].

Table 1.

Inhibitory properties of inhibitor compositions in an aggressive environment.

The results of the conducted scientific research show that the effectiveness of the applied oligomer corrosion inhibitor is related to the presence of aromatic rings in their composition, and we can see that their compositions have a thermally stable and strong structure Table 2.

Table 2.

Mass loss measurement for St-20 steel in 0,5 M H₂SO₄ at 30-60^oC with and without protection grade inhibitor.

As a result of gravimetric studies, it was found that the inhibitory properties of oligomeric corrosion inhibitors based on alkanolamine, corton aldehyde, thiourea and acetic aldehyde inhibit the corrosion of St-20 metal class in an acidic environment. The highest inhibition efficiency was observed in the inhibitor IK-2, IK-3, and it was found that the inhibition efficiency was 94.7% at 30^oC-60^oC.

Conclusions. The preparation of composite corrosion inhibitors and the main physicochemical and inhibitory properties of corrosion inhibitors were studied.  It was found that the use of inhibitors developed in water supply systems and circulating water, as well as in the oil and gas-chemical industry is environmentally safe, and their efficiency was 94.7 percent.  The composition of IK-1, IK-2, IK-3, IK-4 inhibitors is effective, and this inhibitor differs from other corrosion inhibitors by maintaining high protective properties even in the presence of emulsified hydrocarbons and hydrogen sulfide.

References:

1. Андреев И.Н. Введение в коррозиологию: Учебное пособие. Казан: Изд-во Казанского государственного технологического ун-та, 2004. -140 с
2. Новый справочник химика и технолога. Электродные процессы. Химическая кинетика и диффузия. Коллоидная химия. Под ред. Акад. Раен, д.х.н., проф. Симановой С.А. Санкт-Петербург, НПО Профессионал, 2006.
3. Raxmatova G.B., Kurbanov М.J., Turabayeva N.B.,Tursunova G.K., Study of inspactive properties against corrosion of α-aminocetones and their products // Austrian Journal of Technical and Natural Sciences. №5-6, -2020. - P. 54-59.
4. Бекназаров Х.С., Джалилов А.Т. Защита стали от коррозии олигомерными ингибиторами и их композицими // Химия и химическая технология.-2015. -№1. –С. 50-52.
5. А.Х.Нарзуллаев Mетоды защиты металлов от коррозии от органических ингибиторов, представляющих собой гетероциклические соединения, содержащие серу, азот и р-связи Дата публикации 2024 Журнал Universum: технические науки Том 6 Номер 2 (119) Страницы 56-59
6. Narzullayev Akmal Assessment of the inhibitory properties of a corrosion inhibitor ik-1 in aquate and salt environments.  Дата публикации 2024 Журнал Universum: технические науки Том 8 Номер 2 (119) Страницы 39-42
7. A.Kh Narzullayev, Kh.S Beknazarov, AT Jalilov - Scientific Bulletin of Namangan State University, 2021 Том 2. Номе 2. Страницы 77-81
8. Бекназаров Х.С., Джалилов А.Т. Изучение антикоррозионных свойств новых олигомерных ингибиторов коррозии // Композиционные материалы. 2014. -№3. –С. 20-24.