RT Journal Article
T1 Pitting corrosion on highly alloyed stainless steels in dilute sulphuric acid containing sodium chloride
A1 Huttunen-Saarivirta, E.
A1 Isotahdon, E.
A1 Que, Z.
A1 Lindgren, M.
A1 Mardoukhi, A.
A1 Jorcin, J. B.
A1 Mocnik, P.
A1 Kosec, T.
A1 Ouazari, Y. El
A1 Mameng, S. Hägg
A1 Wegrelius, L.
AB 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 temperature increase facilitated uniform corrosion. 28-day immersion tests at 90°C confirmed the pitting susceptibility 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.
SN 0013-4686
YR 2023
FD 2023-07-20
LK https://hdl.handle.net/11556/3965
UL https://hdl.handle.net/11556/3965
LA eng
NO Huttunen-Saarivirta , E , Isotahdon , E , Que , Z , Lindgren , M , Mardoukhi , A , Jorcin , J B , Mocnik , P , Kosec , T , Ouazari , Y E , Mameng , S H & Wegrelius , L 2023 , ' Pitting corrosion on highly alloyed stainless steels in dilute sulphuric acid containing sodium chloride ' , Electrochimica Acta , vol. 457 , 142404 . https://doi.org/10.1016/j.electacta.2023.142404
NO Publisher Copyright: © 2023
NO The research has been funded by EIT Raw Materials (acceleration program, grant number 18158 ) and the partner organizations of the CORTOOLS project (2019–2021): VTT Technical Research Centre of Finland Ltd, Metso Outotec Finland Oy, ZAG Slovenian National Building and Civil Engineering Institute, Tecnalia, Outokumpu Stainless AB, Boliden Harjavalta Oy, Ferritico AB and Data Measuring Systems DMS. The funding is gratefully acknowledged.
DS TECNALIA Publications
RD 31 jul 2024