研究目的
Investigating the effects of femtosecond pulsed laser-based surface micro-structuring on the wettability and corrosion resistance of type 304 stainless steel.
研究成果
Femtosecond laser micro-structuring of 304 SS leads to the formation of dense micro-protrusions, initially resulting in super-hydrophilic surfaces that become hydrophobic over time. The laser-treated surfaces showed poorer corrosion resistance compared to untreated surfaces, but corrosion resistance improved with increasing hydrophobicity.
研究不足
The study is limited to type 304 stainless steel and the effects of femtosecond laser treatment. The corrosion resistance was tested only in a specific solution (0.5 M H2SO4 + 0.5 M NaCl).
1：Experimental Design and Method Selection:
Surface micro-structuring of 304 SS was performed using a Ti:Sapphire fs laser with a pulse width of ~50 fs at a wavelength of 800 nm. The laser beam was focused to a spot diameter of ~250 μm on the target.
2：Sample Selection and Data Sources:
Type 304 stainless steel samples were used. The effect of target scanning speed on surface morphology was investigated.
3：List of Experimental Equipment and Materials:
Ti:Sapphire fs laser, scanning electron microscopy (SEM), contact angle measurement instrument (Dataphysics, Model No.: OCA 15 Plus), ACM Gill AC potentiostat.
4：Experimental Procedures and Operational Workflow:
Laser micro-structuring was performed at varying target scan speeds. Surface wettability and corrosion resistance were measured post-treatment.
5：Data Analysis Methods:
SEM images were processed using Leica Qwin software. Corrosion resistance was analyzed using potentio-dynamic polarization technique.
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