Corrosion of pipe steels 20 and 17G1S-U in ground electrolytes with a hydrogen indicator close to neutral

• Autorzy: Polutrenko M. , Maruschak P. , Babii A. , Prentkovskis O.

Identyfikatory

DOI

10.5604/01.3001.0015.0249

• Języki publikacji: EN

Abstrakty

EN

Purpose: of this paper is to analyse the mechanism of near-neutral pH corrosion of main gas pipelines. The stages of main gas pipelines in model environments that meet the soil conditions of Ukraine have been studied. Design/methodology/approach: The corrosion rate of steel specimens from steels 17G1S-U and 20 and the influence of borate buffers on their protective properties were evaluated. The influence of corrosion time on changes in pH of model media is shown. Morphological features of surface damages of pipe steels are established. The defect analysis of specimens from steels 17G1S-U and 20 by electron scanning microscopy is carried out. Findings: The effect of borate buffers on the protective properties of the steel grades studied was revealed, and changes in the pH of the model media during corrosion processes were described. The main regularities in corrosion, as well as the surface morphology of damaged specimens, were studied by scanning electron microscopy. Research limitations/implications: Detailed investigation of localised corrosion phenomena induced by inclusions that are present in steels 17G1S-U and 20 is extremely critical. In particular, there is still ambiguity as to whether the localised corrosion initiation induced by non-metallic inclusions is an electrochemical process or a chemical process. Practical implications: The research findings will be used when testing specimens from pipe steels under cyclic loading in the model media studied, as well as for predicting the residual life of gas pipelines with corrosion defects. Their generalization will make it possible to develop the effective methods of ground diagnostics and prediction of SCC of main pipelines. Originality/value: It was found that the corrosion rate is determined by internal (nature and properties of the metal) and external (properties of the aggressive medium and the corrosion process conditions) factors. The protective effect for steel 17G1S in medium NS4 + borate buffer (1: 1) was 61.5%. Steel 20 had the greatest protective effect in medium NS4 + borate buffer (1: 3), which was 87.05%.

Słowa kluczowe

EN

gas pipeline; corrosion; stress corrosion; cracking; damage

PL

gazociąg; korozja; korozja naprężeniowa; pękanie; uszkodzenie

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2021
• Tom: Vol. 108, nr 1
• Strony: 16--23
• Opis fizyczny: Bibliogr. 18 poz.

Twórcy

autor

Polutrenko M.

• Ivano-Frankivsk National Technical University of Oil and Gas, Karpatska str. 15, 76019 Ivano-Frankivsk, Ukraine

autor

Maruschak P.

• Department of Industrial Automation, Ternopil National Ivan Puluj Technical University, Ruska str. 56, 46001 Ternopil, Ukraine

• https://orcid.org/0000-0002-3001-0512

autor

Babii A.

• Department of Industrial Automation, Ternopil National Ivan Puluj Technical University, Ruska str. 56, 46001 Ternopil, Ukraine

autor

Prentkovskis O.

• Department of Mobile Machinery and Railway Transport, Faculty of Transport Engineering, Vilnius Gediminas Technical University, Plytinės g. 27, Vilnius LT-10105, Lithuania

Bibliografia

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