Hydrophilic-hydrophobic surface of bipolar plate for fuel cell and preparation method thereof
A hydrophobic surface and fuel cell technology, which is applied to fuel cell components, fuel cells, solid electrolyte fuel cells, etc., can solve the problems of increasing manufacturing costs and steps, long UV irradiation time, and improving bipolar plates and gas diffusion layers. Contact resistance and other issues, to achieve the effect of good conductivity and good corrosion resistance
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[0033]In order to make the process of forming hydrophilicity and hydrophobic surface, more time, more time and low cost, can be modified to metal, metal oxides or metal nitride surfaces with laser, metal oxides and nitrides The specific surface is directly scanned by the laser, and the characteristics of the nitride and oxidation are varied as the selected specific gas or mixed gas, and the characteristics of the nitride and oxidation are generated, thereby forming a particular hydrophobic or hydrophilic surface. The method of direct scanning is simple, straight and fast, and the material body is constant. There is no material residual problem; can also be controlled by a laser suitable wavelength, a spot size, a spot pattern, a pulse width, a scan speed and other parameter control. The roughness of the surface of the material changes in the contact angle of the surface of the material, more controllable. Thus, the present application provides a method for preparing a bipolar plate ...
Embodiment 1
[0063]Such asfigure 1 Schematic flow chart, first preparing to clean the clean Ti-6Al-4V titanium alloy plate bipolar plate; using Nd: YAG laser, wavelength is 1064 nm, pulse width 150ns, pulse repetition rate 50kHz, rectangular beam length 20mm * 0.1mm, energy density (FLUENCE) 1.2J / cm2The laser movement speed is 300 mm / s, with pure nitrogen into the surface of the protective gas, the gas is sprayed, so that the metal surface avoids oxidation and provides surface nitride, as the laser spot moves at the bipolar plate The titanium nitride film was formed on the surface, and the thickness of the nitride layer was about 3 μm;
[0064]Using the laser adopts the Gaussian spot size to 40 μm, energy density ~ 30J / cm2In the same way, the metal surface is protected from the surface of the valley surface, and the laid density is 5mm.-1The score width is about 40 μm, and the contact angle of the surface is controlled at 105 ° to 125 °;
[0065]The same operation is used in the same manner as t...
Embodiment 2
[0068]Such asfigure 2 The flow schematic of a SUS316 stainless steel stamped bipolar plate, a layer of metal chrome layer is plated with a PVD or CVD; Spectial surface is scanned on the surface of the Nd: YAG laser, the wavelength is 1064 nm, pulse width 150ns, pulse repetition rate 50kHz , Rectangular beam length is 20mm * 0.1mm, energy density 0.5 ~ 2J / cm2The laser movement speed is 300 mm / s; atmospheric pressure, the surface of the gas is protected from the surface of the laser, and the metal surface avoids oxidation and provides surface nitride;
[0069]Using the laser adopts the Gaussian spot size to 40 μm, the energy density ~ 30J / cm2 is used, and the metal surface is protected by nitrogen, and the micrometer scratch is carved in the direction of the valley surface, and the score density is 5mm.-1The score width is about 40 μm, and the contact angle of the surface is controlled at 105 ° to 125 °;
[0070]The same operation is used in the same operation as nitriding step being:...
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