Corrosion Resistant CrNX Nanolayers Obtained by Low Temperature Ion Nitriding of Hard Chromium Coated AISI 1045 Steel
| Autor: | S. Mancillas-Salas, J.C. Díaz-Guillén, J.A. Díaz-Elizondo, E.E. Granda Gutiérrez, G. Ochoa-Hernández, N.A. Rodríguez-Rosales, J.A. Díaz Guillén |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
AISI 1045 Mechanical Engineering Delamination Metallurgy Ion nitriding chemistry.chemical_element Nitride Condensed Matter Physics Electrochemistry Corrosion Chromium Hard chromium chemistry Mechanics of Materials Phase (matter) TA401-492 General Materials Science Chromium nitrides Materials of engineering and construction. Mechanics of materials Layer (electronics) Nitriding |
| Zdroj: | Materials Research v.24 n.4 2021 Materials research (São Carlos. Online) Universidade Federal de São Carlos (UFSCAR) instacron:ABM ABC ABPOL Materials Research, Vol 24, Iss 4 (2021) Materials Research, Volume: 24, Issue: 4, Article number: e20210025, Published: 16 JUN 2021 |
| ISSN: | 1980-5373 1516-1439 |
| Popis: | Chromium nitrides CrXN have attracted research interest due to their excellent wear and corrosion properties when are deposited on steels. Nevertheless, due to the considerable difference between CrXN and steel expansion coefficients, microcracks and delamination are still persistent problems. In this regard, this research addressed the generation of CrNX nanolayers, through an ion nitriding process, carried out on hard chromium coated AISI 1045 steel. The effect of nitriding temperature (500°C-550°C) and nitrogen content in plasma (25, 50, and 75%) on corrosion performance and layer characteristics were studied. Grazing Incidence X-ray Diffraction analysis revealed that modified surfaces are composed of nanolayers, constituted by a mixture of CrN, Cr2N, Cr, and Fe4N. Rietveld quantification shows that the fraction of chromium nitrides in the region analyzed increased with increasing both temperature and nitrogen content in plasma, resulting CrN as the predominant phase for all evaluated conditions. The electrochemical behavior of the modified nanolayers was studied by potentiodynamic polarization technique, revealing an enhancement in corrosion performance of chromium coated 1045 steel by the nitriding treatment, showing a corrosion current density 10 times lower than the untreated sample and more positive corrosion potentials for the nitrided samples concerning chromium coated 1045 steel. |
| Databáze: | OpenAIRE |
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