Abstract
Austenitic stainless steels are widely used as biomaterial and corrosion resistance is one of the most important characteristics in determining the suitability of a material for this purpose. Plasma nitriding is a surface treatment that introduces interstitial nitrogen into these steels, which improves this property as a result of the nitrided layer, whose properties depend strongly on the conditions used in the process. In this paper, the nitriding temperatures (623, 673 and 723 K) and times (3, 4 and 5 h) were investigated. The Mössbauer Spectroscopy was correlated to the corrosion results with the purpose of finding the combination of time and temperature that optimize the corrosion improvement. An alternative method of spectra analysis, which analyzes qualitatively the hyperfine magnetic field distributions, was used and showed that the nitrided layer protects against corrosion, not only because of the expanded austenite, but also, and mainly, because of the nitrides, which are formed therein, located up to a depth of 0.1 μm. Moreover, these results indicate that temperature = 673 K and time = 4 h is the most efficient combination to optimize the corrosion resistance of the samples, nitrided at 6 Torr of the 80% H2–20% N2 gas composition. They also confirm that corrosion protection increases for higher nitriding pressure.
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Acknowledgements
This work was partly supported by the Brazilian research funding agencies: Foundation for Research of the State of Minas Gerais (FAPEMIG) (APQ-02127-14 and APQ-02345-14), São Paulo Research Foundation (FAPESP), National Council for Scientific and Technological Development (CNPq) and Coordination for the Improvement of Higher Level -or Education- Personnel (CAPES). The authors also acknowledge the Brazilian Synchrotron Light Laboratory (LNLS).
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This article is part of the Topical Collection on Proceedings of the 16th Latin American Conference on the Applications of the Mössbauer Effect (LACAME 2018), 18-23 November 2018, Santiago de Chile, Chile
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Olzon-Dionysio, M., Olzon-Dionysio, D., Campos, M. et al. Corrosion resistance of AISI 316L plasma nitrided at different temperatures and times. Hyperfine Interact 240, 26 (2019). https://doi.org/10.1007/s10751-019-1563-1
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DOI: https://doi.org/10.1007/s10751-019-1563-1