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We developed surface treatment method of titanium for proton exchange membrane fuel cell bipolar plate. The surface-treated titanium achieved good corrosion resistance in H2SO4 solution (pH = 3) containing 10 ppm F− at 80°C in a simulated proton exchange membrane fuel cell environment. The average corrosion current density was under 0.1 µA cm−2 during potentiostatic polarization testing for 24 h. Further, the contact resistance value was 8.9 mΩ cm2 at a pressure of 1 MPa after corrosion testing, which was very low compared to typical etching samples.
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Sato et al. (2024) studied this question.
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