mgssuvestВестник МГСУVestnik MGSU1997-09352304-6600Moscow State University of Civil Engineering (National Research University) (MGSU)10.22227/1997-0935.2024.12.1977-1989mgssuvest-451Research ArticleИнженерные системы в строительствеEngineering systems in constructionОсобенности развития питтинговой коррозии стальных труб систем водоснабженияDevelopment of pitting corrosion of steel pipes of water supply systemshttps://orcid.org/0000-0003-4616-2489ЧухинВ. А.ChukhinV. A.

Валентин Александрович Чухин — кандидат технических наук, доцент, научный сотрудник научно-образовательного центра «Водоснабжение и водоотведение»

129337, г. Москва, Ярославское шоссе, д. 26

РИНЦ AuthorID: 717961, Scopus: 57194340218

Valentin A. Chukhin — Candidate of Technical Science, Associate Professor, research fellow of Research and Education Centre “Water supply and sewage”

26 Yaroslavskoe shosse, Moscow, 129337

RSCI AuthorID: 717961, Scopus: 57194340218

sigma85@yandex.ruhttps://orcid.org/0000-0003-2567-4450МакишаН. А.MakishaN. A.

Николай Алексеевич Макиша — кандидат технических наук, доцент, директор научно-образовательного центра «Водоснабжение и водоотведение»

129337, г. Москва, Ярославское шоссе, д. 26

РИНЦ AuthorID: 644678, Scopus: 55841479500, ResearcherID: I-1562-2015

Nikolay A. Makisha — Candidate of Technical Science, Associate Professor, director of Research and Education Centre “Water supply and sewage”

26 Yaroslavskoe shosse, Moscow, 129337

RSCI AuthorID: 644678, Scopus: 55841479500, ResearcherID: I-1562-2015

makishana@mgsu.ruНациональный исследовательский Московский государственный строительный университет (НИУ МГСУ)РоссияMoscow State University of Civil Engineering (National Research University) (MGSU)Russian Federation202426122024191219771989Copyright © Чухин В.А., Макиша Н.А., 20242024Чухин В.А., Макиша Н.А.Chukhin V.A., Makisha N.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.vestnikmgsu.ru/jour/article/view/451Введение

Введение. Исследована питтинговая коррозия, предшествующая появлению свищей в стальных и чугунных трубопроводах систем водоснабжения. Процесс образования свищей включает следующие фазы: формирование бугорков, концентрирование электролита внутри бугорков, зарождение и развитие стабильных питтингов на поверхности корродирующего металла под бугорками с дальнейшим образованием отверстий в стенках труб.

Материалы и методы

Материалы и методы. Предметом изучения служили образцы осадка из корродированных труб, находящиеся в сухом виде. Исследование направлено на изучении роли, которую играет один из четырех структурных элементов бугорков — плотный слой. Выявлено двойственное влияние плотного слоя на коррозию. С одной стороны, наличие плотного слоя защищает металл от дальнейшей коррозии, с другой — способствует созданию условий, при которых коррозия из равномерной превращается в питтинговую (точечную).

Результаты

Результаты. Экспериментально установлено, что в процессе коррозии внутри бугорков постепенно растет концентрация раствора, содержащего как компоненты корродирующего металла (катионы), так и находящейся в трубах воды (анионы). Для объяснения коррозии, протекающей в бугорке, проведено сравнение плотного слоя бугорков с анионообменной мембраной, обладающей селективными свойствами, в результате чего в структуре бугорков повышается концентрация агрессивных хлорид-ионов. При этом за счет гидролиза образовавшегося хлорида железа и снижения рН скорость коррозии значительно возрастает. Также рассмотрены вопросы формирования кристаллических форм продуктов коррозии, которые образуются после извлечения труб из системы водоснабжения.

Выводы

Выводы. Выявлена определяющая роль, которую играет один из четырех структурных элементов коррозионных бугорков — плотный слой. Предложенная методика изучения коррозионного осадка может быть использована для оценки действия различных ингибиторов коррозии.

Introduction

Introduction. A research was conducted to study pitting corrosion, which precedes the appearance of fistulas in steel and cast-iron pipelines of water supply systems. The process of fistula formation includes the following phases: the formation of tubercles, the concentration of electrolyte inside the tubercles, the origin and development of stable pitting on the surface of corroding metal under the tubercles with further formation of holes in the walls of pipes.

Materials and methods

Materials and methods. The study was aimed at studying the role played by the dense layer that is one of the four structural elements of the tubercles. The dual effect of the dense layer on corrosion revealed. On the one hand, the presence of a dense layer protects the metal from further corrosion, on the other hand, it helps to create conditions under which corrosion turns from uniform to pitting.

Results

Results. It was experimentally established that during the corrosion process inside the tubercles, the concentration of the solution containing both components of the corroding metal (cations) and water in the pipes (anions) gradually increases. To explain the corrosion process occurring in the tubercle, a comparison of a dense layer of tubercles with an anion exchange membrane with selective properties was carried out, as a result of which the concentration of aggressive chloride ions increases in the structure of the tubercles. At the same time, due to the hydrolysis of the formed iron chloride and a decrease in pH, the corrosion rate increases significantly. The paper also discusses the formation of crystalline forms of corrosion products that are formed after removing pipes from the water supply system.

Conclusions

Conclusions. The determining role played by one of the four structural elements of corrosion tubercles — a dense layer — was revealed. The proposed method for studying the corrosive sludge can be used to evaluate the effect of various corrosion inhibitors.

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The authors declare that there are no conflicts of interest present.