PSI - Issue 42

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 42 (2022) 1458–1466

© 2022 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 the scientific committee of the 23 European Conference on Fracture – ECF23 Abstract The corrosion sensitivity of several austenitic stainless steels (316L, 316Ti, Sanicro28, Sanicro35) and nickel-based alloys (Hastelloy G30 and Hastelloy G35) was determined at elevated temperatures in food grade phosphoric acid (FGPA). The materials were submerged in a harsh environment of >85 wt% FGPA at temperatures ranging from 80 to 160 °C. The main aim was to understand the corrosion phenomena occurring in such environment and define the temperature range for which corrosion is within acceptable limits for these materials. Moreover, the role of a material’s chemical composition on the corrosion resistance in phosphoric acid was experimentally elucidated. The corrosion sensitivity was determined by weight loss measurements, scanning electron microscopy and energy dispersive X-ray spectroscopy. The high concentrations of alloying elements in the selected metals allow them to form a protective passive surface film, which inhibits further oxidation. Depending on the stability of the passive film, materials will be corrosion resistant up to higher temperatures. Alloys with an increased molybdenum content showed a higher general and pitting corrosion resistance up to 140 °C. Moreover, copper alloying resulted in an improved corrosion resistance at higher temperatures. © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) temperature range for which corrosion is within acceptable limits for these materials. Moreover, the role of a material’s Th 23rd European Conference on Fracture - ECF23 Corrosion of austenitic stainless steels and nickel-based alloys in concentrated phosphoric acid at elevated temperatures A. Laureys a, *, E. Wallaert a , L. Claeys a , M. Pinson a , T. Depover a , K. Verbeken a a Department of Materials, Textiles and Chemical Processing, Sustainable Materials Science, Ghent University (UGent), Technologiepark Zwijnaarde 46, B-9052 Ghent, Belgium Laureys *, E. Wal a a a a a

Peer-review under responsibility of 23 European Conference on Fracture - ECF23 Keywords: Corrosion; Phosphoric acid, Nickel-based alloy, Austenitic stainless steel

* Corresponding author. Tel.: +32 933 104 18. E-mail address: aurelie.laureys@ugent.be

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23

2452-3216 © 2022 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 the scientific committee of the 23 European Conference on Fracture – ECF23 10.1016/j.prostr.2022.12.186