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Article

Unravelling the Role of Nitrogen in Surface Chemistry and Oxidation Evolution of Deep Cryogenic Treated High-Alloyed Ferrous Alloy

1
Department of Metallic Materials and Technology, Institute of Metals and Technology, Lepi pot 11, 1000 Ljubljana, Slovenia
2
Jožef Stefan International Postgraduate School, Jamova cesta 39, 1000 Ljubljana, Slovenia
3
Department of Microstructure Physics and Alloy Design, Max Planck Institute for Iron Research, Max-Planck-Straße 1, 40237 Düsseldorf, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Francesco Di Quarto
Coatings 2022, 12(2), 213; https://doi.org/10.3390/coatings12020213
Received: 12 January 2022 / Revised: 29 January 2022 / Accepted: 4 February 2022 / Published: 6 February 2022
The role of nitrogen, introduced by deep cryogenic treatment (DCT), has been investigated and unraveled in relation to induced surface chemistry changes and improved corrosion resistance of high-alloyed ferrous alloy AISI M35. The assumptions and observations of the role of nitrogen were investigated and confirmed by using a multitude of complementary investigation techniques with a strong emphasis on ToF-SIMS. DCT samples display modified thickness, composition and layering structure of the corrosion products and passive film compared to a conventionally heat-treated sample under the same environmental conditions. The changes in the passive film composition of a DCT sample is correlated to the presence of the so-called ghost layer, which has higher concentration of nitrogen. This layer acts as a precursor for the formation of green rust on which magnetite is formed. This specific layer combination acts as an effective protective barrier against material degradation. The dynamics of oxide layer build-up is also changed by DCT, which is elucidated by the detection of different metallic ions and their modified distribution over surface thickness compared to its CHT counterpart. Newly observed passive film induced by DCT successfully overcomes the testing conditions in more extreme environments such as high temperature and vibrations, which additionally confirms the improved corrosion resistance of DCT treated high-alloyed ferrous alloys. View Full-Text
Keywords: deep cryogenic treatment; nitrogen; passive film; ToF-SIMS; surface chemistry; corrosion resistance deep cryogenic treatment; nitrogen; passive film; ToF-SIMS; surface chemistry; corrosion resistance
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MDPI and ACS Style

Jovičević-Klug, P.; Jovičević-Klug, M.; Podgornik, B. Unravelling the Role of Nitrogen in Surface Chemistry and Oxidation Evolution of Deep Cryogenic Treated High-Alloyed Ferrous Alloy. Coatings 2022, 12, 213. https://doi.org/10.3390/coatings12020213

AMA Style

Jovičević-Klug P, Jovičević-Klug M, Podgornik B. Unravelling the Role of Nitrogen in Surface Chemistry and Oxidation Evolution of Deep Cryogenic Treated High-Alloyed Ferrous Alloy. Coatings. 2022; 12(2):213. https://doi.org/10.3390/coatings12020213

Chicago/Turabian Style

Jovičević-Klug, Patricia, Matic Jovičević-Klug, and Bojan Podgornik. 2022. "Unravelling the Role of Nitrogen in Surface Chemistry and Oxidation Evolution of Deep Cryogenic Treated High-Alloyed Ferrous Alloy" Coatings 12, no. 2: 213. https://doi.org/10.3390/coatings12020213

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