| Title: | Rapid oxidation of adsorbed organic impurities on stainless steel by treatment with diluted peroxynitric acid |
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| Authors: | ID Ekar, Jernej, Institut "Jožef Stefan" (Author)
ID Mozetič, Miran, Institut "Jožef Stefan" (Author)
ID Kovač, Janez, Institut "Jožef Stefan" (Author)
ID Recek, Nina, Institut "Jožef Stefan" (Author)
ID Ikawa, Satoshi (Author)
ID Kitano, Katsuhisa (Author) |
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| Files: |  URL - Source URL, visit https://www.mdpi.com/1996-1944/18/21/4984
 PDF - Presentation file, download (1,14 MB)
MD5: 6BB7609F635C73A741BD54B449C4151D
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  IJS - Jožef Stefan Institute
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| Abstract: | 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. |
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| Keywords: | peroxynitric acid, surface modifications, secondary ion mass spectrometry |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 18.09.2025 |
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| Article acceptance date: | 30.10.2025 |
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| Publication date: | 31.10.2025 |
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| Publisher: | MDPI |
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| Year of publishing: | 2025 |
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| Number of pages: | str. 1-11 |
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| Numbering: | Vol. 18, iss. 21, [article no.] 4984 |
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| Source: | Švica |
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| PID: | 20.500.12556/DiRROS-24079  |
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| UDC: | 621.7+621.9 |
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| ISSN on article: | 1996-1944 |
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| DOI: | 10.3390/ma18214984 |
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| COBISS.SI-ID: | 256715779 |
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| Copyright: | © 2025 by the authors. |
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| Note: | Nasl. z nasl. zaslona;
Soavtorji iz Slovenije: Miran Mozetič, Janez Kovač, Nina Recek;
Opis vira z dne 11. 11. 2025;
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| Publication date in DiRROS: | 11.11.2025 |
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| Views: | 132 |
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| Downloads: | 64 |
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