| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Functional and Structural Thin Films and Coatings
|
| Presentation Title |
A-2: Corrosion Behaviour of an Aisi 4140 Steel Nitrided by Plasma in a Seawater Medium Solution |
| Author(s) |
Ariosto Medina, Jesús Valdes, Claudio Aguilar, Engelbert Huape |
| On-Site Speaker (Planned) |
Ariosto Medina |
| Abstract Scope |
In this work, the plasma nitriding effects on the corrosion
behaviour were studied. After plasma treatments the corrosion resistance of the AISI 4140 steel was evaluated by Tafel extrapolation, linear polarization resistance and electrochemical impedance spectroscopy (EIS) in artificial seawater solution at room temperature. The nitrided surfaces were evaluated by X-ray diffraction (XRD) and optical microscopy(OM) techniques. The corroded surfaces were characterized by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Results shows that nitrided surfaces composed of a mixture of ε-Fe2-3N and γ´-Fe4N nitrides exhibited the best corrosion resistance, allowing stable values of Ecorr kinetics, because in this alloy decreased the corrosion rate by two orders of magnitude compared with the nitrided surfaces composed only of ε-Fe2-3N. EIS results showed that the nitrided surfaces containing flaws, porous or any others discontinuities presented corrosion processes controlled by diffusive processes. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Surface Modification and Coatings, Thin Films and Interfaces, Iron and Steel |