20.500.12556/DiRROS-24079 Rapid oxidation of adsorbed organic impurities on stainless steel by treatment with diluted peroxynitric acid Stainless steel forms a native film of mixed metal oxides, and organic impurities are likely to adsorb on the surface upon exposure to ambient conditions. For many applications, oxides and impurities should be removed, and several techniques have been used for decades. An innovative method is presented in this paper. The organic impurities were oxidized using a water solution of 1 M peroxynitric acid (PNA). Stainless steel samples were immersed in the solution, and the oxidation of organic impurities was evaluated by the ultra-thin depth profiling using secondary ion mass spectrometry (SIMS). A minute of treatment with PNA caused oxidation of organic impurities and a decrease in the SIMS CN– signal over an order of magnitude. Prolonged treatment caused the selective removal of the native iron oxide film, leaving a protective film of chromium oxide. Removal of the iron oxide film was also observed when stainless steel was treated with 1 M HNO3. The PNA method is useful for routine cleaning of stainless steel to remove the organic contaminants from the surface and keep the passive chromium oxide film intact. It is ecologically friendly and enables rapid decomposition of the traces of organic impurities likely to be adsorbed on the metallic surfaces. peroxynitric acid surface modifications secondary ion mass spectrometry oksidne plasti true false true MDPI Švica Angleški jezik Slovenski jezik © 2025 by the authors. Neznano 2025-11-11 13:59:48 2025-11-11 13:59:48 2025-11-12 03:48:14 0000-00-00 00:00:00 2025 0 0 Nasl. z nasl. zaslona; Soavtorji iz Slovenije: Miran Mozetič, Janez Kovač, Nina Recek; Opis vira z dne 11. 11. 2025; str. 1-11 iss. 21, [article no.] 4984 Vol. 18 Nov. 2025 0000-00-00 Zaloznikova Objavljeno apc 2025-09-18 2025-10-30 2025-10-31 621.7+621.9 1996-1944 10.3390/ma18214984 256715779 https://www.mdpi.com/1996-1944/18/21/4984 1 4f42549d-befe-11f0-94a7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=35799 RAZ_Ekar_Jernej_2025.pdf RAZ_Ekar_Jernej_2025.pdf 1 6BB7609F635C73A741BD54B449C4151D 05734624bafc07f09179e1c6040f5342a51b2bc0edc2884618c6b4be9cc8b966 af3628e1-befe-11f0-94a7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=35800 Institut Jožef Stefan 0 0 0