PSI - Issue 59

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000

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Procedia Structural Integrity 59 (2024) 151–157

© 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers Abstract The paper discusses the interaction of hydrogen with operated pipe steels under conditions modelling transportation of hydrogen through the existing gas transmission network in Ukraine and the role of molecular hydrogen in the processes of corrosion and hydrogenation of pipe steels taking into account operational factors (stresses, working environment, ageing). The tests have been done on steel X70, widely used in pipelines of the Ukrainian gas transmission network. Gaseous hydrogen was supplied to the tested specimen’s area by means of electrolysis using a couple of platinum electrodes and a power supply. It is established t hat hydrogen significantly affects the electrochemical processes on steel in a model corrosive medium, which indicate the intensity of internal corrosion and hydrogenation of steel from the inner surface of the pipe. In particular, polarization resistance, as a measure of the corrosion activity of the steel, changes essentially with supplying electrolytically generated hydrogen. An additional mixture of the corrosive environment, modelling turbulence in the pipe, intensifies metal dissolution. Operated steel exhibits a higher corrosion activity under these testing conditions. The obtained results indicate the exceptional importance of evaluating the mechanisms of hydrogen interaction with pipeline steels from the point of the safe operation of the existing pipeline network in the case of transportation of hydrogen or its mixtures with natural gas. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers VII International Conference “In -service Damage of Materials: Diagnostics and Prediction ” (DMDP 2023) Influence of gaseous hydrogen on corrosion of pipeline steel Myroslava Hredil*, Oleksandr Tsyrulnyk, Ivan Shtoyko, Olha Zvirko Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine, 5 Naukova str., Lviv 79060, Ukraine Abstract The paper discusses the interaction of hydrogen with operated pipe steels under conditions modelling transportation of hydrogen through the existing gas transmission network in Ukraine and the role of molecular hydrogen in the processes of corrosion and hydrogenation of pipe steels taking into account operational factors (stresses, working environment, ageing). The tests have been done on steel X70, widely used in pipelines of the Ukrainian gas transmission network. Gaseous hydrogen was supplied to the tested specimen’s area by means of electrolysis using a couple of platinum electrodes and a power supply. It is established t hat hydrogen significantly affects the electrochemical processes on steel in a model corrosive medium, which indicate the intensity of internal corrosion and hydrogenation of steel from the inner surface of the pipe. In particular, polarization resistance, as a measure of the corrosion activity of the steel, changes essentially with supplying electrolytically generated hydrogen. An additional mixture of the corrosive environment, modelling turbulence in the pipe, intensifies metal dissolution. Operated steel exhibits a higher corrosion activity under these testing conditions. The obtained results indicate the exceptional importance of evaluating the mechanisms of hydrogen interaction with pipeline steels from the point of the safe operation of the existing pipeline network in the case of transportation of hydrogen or its mixtures with natural gas. VII International Conference “In -service Damage of Materials: Diagnostics and Prediction ” (DMDP 2023) Influence of gaseous hydrogen on corrosion of pipeline steel Myroslava Hredil*, Oleksandr Tsyrulnyk, Ivan Shtoyko, Olha Zvirko Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine, 5 Naukova str., Lviv 79060, Ukraine

Keywords: Pipeline; Steel; Hydrogen; Corrosion; Degradation; Operation. Keywords: Pipeline; Steel; Hydrogen; Corrosion; Degradation; Operation.

* Corresponding author. Tel.: +38 032 2296294 E-mail address: mysya.lviv@gmail.com * Corresponding author. Tel.: +38 032 2296294 E-mail address: mysya.lviv@gmail.com

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers 2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers 10.1016/j.prostr.2024.04.023