Status : Verified
| Personal Name | Omega, Ma. Rosario E. |
|---|---|
| Resource Title | Effect of Plasma Nitriding Pretreatment on the Properties and Corrosion Behavior of TiSiN-Coated AISI D2 Steel Substrates |
| Date Issued | 2 February 2026 |
| Abstract | Corrosion is an inevitable and irreversible phenomenon defined as the degradation of a material due to its interaction with the environment, either alone or in combination with mechanical forces. It is a serious concern affecting various industrial sectors worldwide because of its detrimental impact on the performance, safety, and service life of metallic components. To mitigate corrosion, the application of protective coatings combined with appropriate surface pretreatment methods has proven to be an effective approach. In this study, the effect of plasma nitriding as a pretreatment technique on the structural, mechanical, and corrosion behavior of titanium silicon nitride (TiSiN)-coated American Iron and Steel Institute (AISI) D2 steel samples was evaluated. Plasma nitriding, a surface hardening process that promotes the diffusion of nitrogen (N) into metallic substrates to form hard nitrides, was conducted using a direct current (DC) bias while varying substrate temperature, bias voltage, and exposure time. An increase in surface hardness of up to 95% was achieved following nitriding. Subsequently, TiSiN coatings were deposited via cathodic arc evaporation. The influence of plasma nitriding parameters on phase composition, surface hardness, nitriding depth, coating morphology, elemental composition, and corrosion performance was investigated using X-ray diffraction, scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS), Vickers microhardness profiling, coating thickness and adhesion tests, and accelerated corrosion testing. Structural analysis revealed α-Fe as the dominant phase in nitrided substrates and titanium nitride (TiN)-based phases in coated samples, with peak shifts indicating lattice distortion resulting from N incorporation. Higher bias voltages produced more pronounced peak shifts and surface hardening, suggesting enhanced nitrogen uptake. SEM-EDS analysis showed improved coating retention and surface morphology under se |
| Degree Course | MS Materials Science and Engineering |
| Language | English |
| Keyword | plasma nitriding, TiSiN coating, AISI D2 steel, duplex treatment, corrosion protection |
| Material Type | Thesis/Dissertation |
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