20.500.12556/RUL-177901 Effect of natural seawater salinity on stainless steel corrosion Enhanced resistance in seawater bittern Stainless steels are commonly used in coastal structures and in seawater desalination and treatment systems, so understanding their corrosion behaviour under different salinity conditions is important to ensure the durability and reliability of the material. In this study, the behaviour of AISI 304L, AISI 316L, and 2205 duplex stainless steels (DSS) was tested in three media with different salinities: brackish water (BSW), seawater (SW), and concentrated seawater bittern (CSW). Testing was conducted using classical electrochemical methods (open circuit potential, linear, and potentiodynamic polarization) supplemented by surface analyses (optical microscopy, SEM/EDS, and optical profilometry). Corrosion resistance increased in the order AISI 304L < AISI 316L < 2205 DSS. Duplex steel 2205 performed best in all media: it exhibited the most positive open circuit potential, the highest polarization resistance, the lowest corrosion current density, and the widest passive range. Unexpectedly, CSW showed improved corrosion resistance compared to SW, which is explained by the reduced chloride content characteristic of seawater bittern after NaCl crystallisation and the presence of magnesium, calcium, and sulphate ions that promote the formation of protective deposits on the metal surface. Pronounced pitting was observed on AISI 304L steel in seawater, while surface degradation in brackish and concentrated seawater was significantly less, and 2205 DSS remained almost unchanged. The results obtained can serve as guidelines for the design and selection of materials for equipment and structures in industries operating in aggressive marine and coastal environments, such as desalination plants, shipbuilding, and energy systems. corrosion stainless steel chloride media electrochemical methodsa surface investigation true false true Angleški jezik Angleški jezik Članek v reviji 2026-01-13 04:23:06 2026-02-17 10:19:09 2026-02-18 04:22:26 0000-00-00 00:00:00 2026 0 0 Str. 1-21 iss. 1 Vol. 16 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2025-12-22 669 2076-3417 10.3390/app16010109 264376323 applsci-16-00109_(1).pdf applsci-16-00109_(1).pdf 1 400A7B3241BCFE7CC788B4C2A095E0D3 385ed5138ce865ec7a1539e982bb1cfd5e3a09dd783dae3f52635a30a785175a 59b64c77-0be1-11f1-a1ba-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=228167 https://www.mdpi.com/2076-3417/16/1/109 0 67674f93-0be1-11f1-a1ba-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=228168 Naravoslovnotehniška fakulteta 0 0 0