研究目的
Investigating the development of steel surfaces with permanent highly hydrophilic and anti-corrosive properties using femtosecond laser processing in a saturated background gas atmosphere.
研究成果
The femtosecond laser microstructuring of steel in the presence of ammonia gas provides a dual functionality on steel, namely hydrophilicity and corrosion resistance. The laser-treated steel surfaces exhibit highly hydrophilic properties, which are stable over time, and remarkable anti-corrosion properties. This method opens the way for the production of high-performance steel components for various potential applications.
研究不足
The study does not elucidate the exact nitrogen groups terminating the surface, which requires further investigation via X-ray Photoelectron Spectroscopy. Additionally, the mechanism of the anticorrosion behavior of laser-processed steel in a reactive ammonia atmosphere needs further exploration.
1：Experimental Design and Method Selection:
The study employed femtosecond laser processing in a saturated background gas atmosphere to modify steel surfaces. The laser processing was conducted in the presence of ammonia gas to achieve stable hydrophilic and anti-corrosive properties.
2：Sample Selection and Data Sources:
Commercially polished steel alloy samples (40CrMnMoS8-6) were used. The samples were cleaned in an ultrasonic ethanol bath before laser processing.
3：List of Experimental Equipment and Materials:
An Yb:KGW laser source was used for femtosecond laser processing. The setup included a vacuum chamber, a mechanical oil pump, and a high-precision X-Y translation stage for sample displacement.
4：Experimental Procedures and Operational Workflow:
The laser processing was performed in a vacuum chamber evacuated to a residual pressure of approximately 10^-2 mbar, then backfilled with NH3 gas to 800 mbar. The laser beam was focused onto the sample surface, and areas of 5 mm × 5 mm were fabricated with a scan velocity of 500 μm/s and a line scan separation of 20 μm.
5：Data Analysis Methods:
The laser-irradiated samples were characterized by field emission scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and static contact angle (CA) measurements to evaluate surface morphology, chemical composition, and wettability, respectively.
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