| Summary: | 碩士 === 國防大學理工學院 === 化學工程碩士班 === 100 === Purpose of this study the chromium carbon coating of high conductivity and corrosion resistance between chromium.Duty Cycle experiment with the frequency of the operating parameters, corrosion resistance and composition of the detection analysis on the coating of different frequencies and Duty Cycle.Coating microstructure and composition of the chromium carbide coating surface morphology observed by SEM; use of XRD and XPS observation chrome carbon coating structure and composition; EPMA measurements chromium carbon coating amount of ingredients.Bipolar plate performance testing: the potentiostat to detect the corrosion resistance by potentiodynamic polarization in 0.5 M H2SO4(aq); contact angle measurements of chromium carbon coating hydrophobic; contact with the electrical conductivity of the chromium carbon coatings for impedance measurement.
The experimental results show that at low current density of 10A∙dm-2, operating temperature 10℃with the main salt 0.1 M, the pulse parameters frequency 10 Hz and Duty Cycle 90% of the coating surface cracks and dense, corrosion current of up to 9.8E-8 A∙cm-2; different frequency Duty Cycle of coating thickness variation results show that the precipitation rate performance of the pulse plating are compared with DC plating outstanding, of which 50% of the thickness of the coating frequency of 1000 Hz and Duty Cycle up to 40 um ; In addition, the different frequencies and under the Duty Cycle of pulse plating coating carbon atom content in this range of operating conditions are up to 20%; DC plating coating metal bipolar plate performance test contact angle of 74.9∘, pulse parameters frequency of 10 Hz and Duty Cycle 90% coating contact angle of 83.8∘; DC plating and pulse parameters, frequency of 10 Hz with Duty Cycle 90% of the coating in contact resistance values were 22 mΩ∙cm and 14 mΩ∙cm in 140N∙cm-2; DC plating and pulse parameters of frequency 10 Hz andDuty Cycle90% average corrosion current of 2.7E-2 A∙cm-2 and
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8.9E-6 A∙cm-2.
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