20.500.12556/DiRROS-16696 Pitting corrosion on highly alloyed stainless steels in dilute sulphuric acid containing sodium chloride Stainless steels are widely used in industrial assets and equipment. Despite their good corrosion resistance under a wide range of operating conditions, there is the possibility of pitting corrosion in the presence of chlorides. However, very few studies have identified the safe operating conditions for various high-alloyed stainless steel grades by comparing their pitting susceptibility. In this research, the susceptibility to pitting attack of five stainless steels with austenitic and duplex microstructures was examined in dilute sulphuric acid solution with varying amounts of NaCl at the temperatures of 50, 90 and 130◦C. Based on potentiodynamic polarization scans, none of the test materials underwent pitting corrosion at 50◦C, but differences in susceptibility to pitting attack were clear between the test materials and NaCl concentrations at the temperature of 90◦C, and further tem- perature increase facilitated uniform corrosion. 28-day immersion tests at 90◦ C confirmed the pitting suscepti- bility of duplex grades 1.4662 (PREN 33) and 1.4462 (PREN 35) in the presence of at least 2000 mg/L NaCl, but not the susceptibility of a corresponding austenitic grade 1.4539 (PREN 34). The grades 1.4547 (PREN 43) and 1.4410 (PREN 44) were not susceptible to pitting corrosion under any of the studied conditions. The results from materials microstructural and electrochemical characterization are presented and discussed in this paper. stainless steel austenitic stainless steel duplex stainless steel pitting atttack nerjavno jeklo avstenitno nerjavno jeklo dupleks nerjavno jeklo luknjičasta korozija true false true Elsevier Angleški jezik Slovenski jezik © 2023 The Authors. Published by Elsevier Ltd. Neznano 2023-07-12 09:31:11 2023-07-12 10:11:49 2023-07-13 03:35:23 0000-00-00 00:00:00 2023 0 0 Nasl. z nasl. zaslona; Opis vira z dne 6. 6. 2023; str. 1-28 [article no.] 142404 Vol. 457 Jul. 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2023-04-14 544.5/.6 1873-3859 10.1016/j.electacta.2023.142404 149437699 https://www.sciencedirect.com/science/article/pii/S0013468623005820? 1 4f29d751-2075-11ee-8cc8-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=22664 RAZ_Huttunen-Saarivirta_Elina_2023.pdf RAZ_Huttunen-Saarivirta_Elina_2023.pdf 1 AF6002433F61ACA5DE38C2FB9C44CBE9 88fbddeec5709b06c73e263fdb46047e33098f7b51c987c260780f4fa21a3b57 d87a6318-207a-11ee-8cc8-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=22665 Zavod za gradbeništvo Slovenije 0 0 0