Effect of Cr content on the structure and corrosion properties of (FeCoNi)0.75Cu0.25-xCrx high entropy alloys in 1 M H2SO4
The present paper studies the influence of Cr addition on the structure, microstructure, and corrosion properties of (FeCoNi)0.75Cu0.25-xCrx (x = 0, 0.05, 0.1, 0.15, 0.2, 0.25) high entropy alloys fabricated by vacuum arc melting. The structure and microstructure have been evaluated utilizing X-ray...
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Elsevier
2025-03-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425004314 |
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| author | Y. Heidari Kh. Gheisari M. Yeganeh |
| author_facet | Y. Heidari Kh. Gheisari M. Yeganeh |
| author_sort | Y. Heidari |
| collection | DOAJ |
| description | The present paper studies the influence of Cr addition on the structure, microstructure, and corrosion properties of (FeCoNi)0.75Cu0.25-xCrx (x = 0, 0.05, 0.1, 0.15, 0.2, 0.25) high entropy alloys fabricated by vacuum arc melting. The structure and microstructure have been evaluated utilizing X-ray diffraction and field emission scanning electron microscopy coupled with energy dispersive spectroscopy. The corrosion behavior has been analyzed by potentiodynamic polarization, electrochemical impedance spectroscopy, and Mott–Schottky analysis. The data reveal that Cr considerably enhances both uniform and pitting corrosion resistance. The passivation current density and passivation potential range significantly increased with the incorporation of Cr, reaching 0.7 μA/cm2 and 1156 mV, respectively, at a Cr concentration of 25 at% in 1 M H2SO4. This improvement is attributed to the development of a uniform microstructure and the elimination of microsegregation in the FCC matrix, which facilitates the formation of a protective chromium oxide/hydroxide layer. The thickness and donor density of the passive film in the alloy containing 25 at% Cr are calculated to be 0.41 nm and 5.7 × 1021 cm−3, respectively, which are comparable to the values reported for the passive film in high entropy alloys. |
| format | Article |
| id | doaj-art-740d872bdbf6427ba93ac7c8de7654e1 |
| institution | OA Journals |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-740d872bdbf6427ba93ac7c8de7654e12025-08-20T02:01:15ZengElsevierJournal of Materials Research and Technology2238-78542025-03-01355322533510.1016/j.jmrt.2025.02.184Effect of Cr content on the structure and corrosion properties of (FeCoNi)0.75Cu0.25-xCrx high entropy alloys in 1 M H2SO4Y. Heidari0Kh. Gheisari1M. Yeganeh2Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, IranCorresponding author.; Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, IranDepartment of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, IranThe present paper studies the influence of Cr addition on the structure, microstructure, and corrosion properties of (FeCoNi)0.75Cu0.25-xCrx (x = 0, 0.05, 0.1, 0.15, 0.2, 0.25) high entropy alloys fabricated by vacuum arc melting. The structure and microstructure have been evaluated utilizing X-ray diffraction and field emission scanning electron microscopy coupled with energy dispersive spectroscopy. The corrosion behavior has been analyzed by potentiodynamic polarization, electrochemical impedance spectroscopy, and Mott–Schottky analysis. The data reveal that Cr considerably enhances both uniform and pitting corrosion resistance. The passivation current density and passivation potential range significantly increased with the incorporation of Cr, reaching 0.7 μA/cm2 and 1156 mV, respectively, at a Cr concentration of 25 at% in 1 M H2SO4. This improvement is attributed to the development of a uniform microstructure and the elimination of microsegregation in the FCC matrix, which facilitates the formation of a protective chromium oxide/hydroxide layer. The thickness and donor density of the passive film in the alloy containing 25 at% Cr are calculated to be 0.41 nm and 5.7 × 1021 cm−3, respectively, which are comparable to the values reported for the passive film in high entropy alloys.http://www.sciencedirect.com/science/article/pii/S2238785425004314High entropy alloysChromiumPassive filmMicrostructureMott–Schottky |
| spellingShingle | Y. Heidari Kh. Gheisari M. Yeganeh Effect of Cr content on the structure and corrosion properties of (FeCoNi)0.75Cu0.25-xCrx high entropy alloys in 1 M H2SO4 Journal of Materials Research and Technology High entropy alloys Chromium Passive film Microstructure Mott–Schottky |
| title | Effect of Cr content on the structure and corrosion properties of (FeCoNi)0.75Cu0.25-xCrx high entropy alloys in 1 M H2SO4 |
| title_full | Effect of Cr content on the structure and corrosion properties of (FeCoNi)0.75Cu0.25-xCrx high entropy alloys in 1 M H2SO4 |
| title_fullStr | Effect of Cr content on the structure and corrosion properties of (FeCoNi)0.75Cu0.25-xCrx high entropy alloys in 1 M H2SO4 |
| title_full_unstemmed | Effect of Cr content on the structure and corrosion properties of (FeCoNi)0.75Cu0.25-xCrx high entropy alloys in 1 M H2SO4 |
| title_short | Effect of Cr content on the structure and corrosion properties of (FeCoNi)0.75Cu0.25-xCrx high entropy alloys in 1 M H2SO4 |
| title_sort | effect of cr content on the structure and corrosion properties of feconi 0 75cu0 25 xcrx high entropy alloys in 1 m h2so4 |
| topic | High entropy alloys Chromium Passive film Microstructure Mott–Schottky |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425004314 |
| work_keys_str_mv | AT yheidari effectofcrcontentonthestructureandcorrosionpropertiesoffeconi075cu025xcrxhighentropyalloysin1mh2so4 AT khgheisari effectofcrcontentonthestructureandcorrosionpropertiesoffeconi075cu025xcrxhighentropyalloysin1mh2so4 AT myeganeh effectofcrcontentonthestructureandcorrosionpropertiesoffeconi075cu025xcrxhighentropyalloysin1mh2so4 |