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Acceleration of Plasma Nitriding at 550 °C with Rare Earth on the Surface of 38CrMoAl Steel
| Content Provider | MDPI |
|---|---|
| Author | Liu, Dongjing You, Yuan Yan, Mufu Chen, Hongtao Li, Rui Hong, Lin Han, Tingjie |
| Copyright Year | 2021 |
| Description | In order to explore the effect of the addition of rare earth (RE) to a steel microstructure and the consequent performance of a nitrided layer, plasma nitriding was carried out on 38CrMoAl steel in an atmosphere of $NH_{3}$ at 550 °C for 4, 8, and 12 h. The modified layers were characterized using an optical microscope (OM), a microhardness tester, X-ray diffraction (XRD), a scanning electron microscope (SEM), a transmission electron microscope (TEM), and an electrochemical workstation. After 12 h of nitriding without RE, the modified layer thickness was 355.90 μm, the weight gain was 3.75 $mg/cm^{2}$, and the surface hardness was 882.5 $HV_{0.05}$. After 12 h of RE nitriding, the thickness of the modified layer was 390.8 μm, the weight gain was 3.87 $mg/cm^{2}$, and the surface hardness was 1027 $HV_{0.05}$. Compared with nitriding without RE, the $ε-Fe_{2-3}$N diffraction peak was enhanced in the RE nitriding layer. After 12 h of RE nitriding, La, $LaFeO_{3}$, and a trace amount of $Fe_{2}O_{3}$ appeared. The corrosion rate of the modified layer was at its lowest (15.089 × $10^{−2}$ mm/a), as was the current density (1.282 × $10^{−5}$ $A/cm^{2}$); therefore, the corrosion resistance improved. |
| Starting Page | 1122 |
| e-ISSN | 20796412 |
| DOI | 10.3390/coatings11091122 |
| Journal | Coatings |
| Issue Number | 9 |
| Volume Number | 11 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-09-16 |
| Access Restriction | Open |
| Subject Keyword | Coatings Applied Chemistry 38crmoal Steel Plasma Nitriding Microhardness Corrosion Resistance Modified Layer |
| Content Type | Text |
| Resource Type | Article |
