Evaluation of Superhydrophobic Surfaces for Improving Corrosion Resistance of Nozzle Shafts in Diesel Injection Systems
11th World Congress on Momentum, Heat and Mass Transfer, MHMT 2026, Paris, Fransa, 14 - 16 Nisan 2026, ss.1-8, (Tam Metin Bildiri)
- Yayın Türü: Bildiri / Tam Metin Bildiri
- Doi Numarası: 10.11159/csp26.121
- Basıldığı Şehir: Paris
- Basıldığı Ülke: Fransa
- Sayfa Sayıları: ss.1-8
- Anahtar Kelimeler: Corrosion resistance, Diesel injection system, Laser texturing, Lotus effect, Nozzle shaft, Superhydrophobic surface, Wettability
- Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
- Bursa Uludağ Üniversitesi Adresli: Evet
Özet
Recent emission regulations have significantly altered the operating conditions of modern diesel engines, leading to increased low-load operation, frequent start-stop events, and aggressive cooling and exhaust gas recirculation strategies. These conditions promote water condensation and the formation of acidic vapors in fuel injector environments, accelerating corrosion mechanisms on nozzle shaft components and posing new durability challenges for diesel injection systems. This study investigates superhydrophobic surface concepts for diesel injector nozzle shafts with a focus on application-relevant corrosion mechanisms. Due to the cylindrical geometry and strict dimensional tolerances of nozzle shafts, experimental investigations were conducted on flat test specimens manufactured from the same material to enable controlled surface modification and systematic characterization. Surface structuring was performed using laser-based texturing techniques to generate micro-and nano-scale surface features. In addition, controlled surface modification steps were applied to further tailor surface morphology. Selected surfaces were subsequently treated with a low-surface-energy modification to stabilize hydrophobic behavior. Wettability characterization demonstrated that laser-textured surfaces exhibit a pronounced increase in water contact angle compared to untreated references, approaching the superhydrophobic regime. Further enhancement of water repellency was achieved through the combined application of surface structuring and surface modification. Preliminary corrosion screening was conducted using short-term salt spray exposure, while ongoing work focuses on more application-representative testing involving acidic vapor environments. The results provide an application-driven framework for improving the corrosion resistance of injector nozzle shaft surfaces under increasingly aggressive diesel engine operating conditions.