Corrosion Resistance of the Inconel 740H Nickel Alloy after Pulse Plasma Nitriding at a Frequency of 10 kHz

Ryszard Sitek , Janusz Kamiński , Jarosław Mizera


The microstructure and corrosion resistance of the CrN, Cr2N layer produced by pulse plasma ion nitriding at a frequency of 10 kHz on the Inconel 740H nickel superalloy were examined. The microstructure of the layers were characterized by light microscope and scanning electron microscopy. The corrosion resistance was examined by the impedance and potentiodynamic methods in a 0.1 M Na2SO4 solution and an acidified (pH = 4) 0.1 M NaCl solution at room temperature. The layer obtained, about 4.5 μm thick, contains CrN, Cr2N phases. It is continuous on the entire cross-section of the sample and adheres well to the substrate. However, in the chloride environment it constitutes an inhomogeneous cathodic coating for corrosion and thereby intensifies pitting corrosion of the material. In chloride-less environment, on the other hand, the layer has no essential effect on the corrosion rate of the Inconel 740H nickel alloy.
Author Ryszard Sitek (FMSE / DMD)
Ryszard Sitek,,
- Division of Materials Design
, Janusz Kamiński (FMSE / DSE)
Janusz Kamiński,,
- Division of Surface Engineering
, Jarosław Mizera (FMSE / DMD)
Jarosław Mizera,,
- Division of Materials Design
Journal seriesActa Physica Polonica A, ISSN 0587-4246
Issue year2016
Publication size in sheets0.5
Keywords in EnglishNickel-chromium alloys – Corrosion, Corrosion resistance, Nitriding, Microstructure, Scanning electron microscopy, Plasma (Ionized gases), Inconel
ASJC Classification3100 General Physics and Astronomy
Languageen angielski
Score (nominal)15
Score sourcejournalList
ScoreMinisterial score = 15.0, 02-02-2020, ArticleFromJournal
Ministerial score (2013-2016) = 15.0, 02-02-2020, ArticleFromJournal
Publication indicators WoS Citations = 1; Scopus Citations = 1; Scopus SNIP (Source Normalised Impact per Paper): 2016 = 0.399; WoS Impact Factor: 2016 = 0.469 (2) - 2016=0.489 (5)
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