| WANG Jun-bin,XIE Zhi-yong,GAO Ping-ping,WU Xiao-bo,TAO Tao,OUYANG Tao,HUANG Qi-zhong.Corrosion Protection of GO-PTFE-C Composite Coatings on Ti Alloy Plate[J],48(3):149-154 |
| Corrosion Protection of GO-PTFE-C Composite Coatings on Ti Alloy Plate |
| Received:September 15, 2018 Revised:March 20, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.03.021 |
| KeyWord:Ti-based bipolar plate hydrothermal impregnation method graphene corrosion resistance proton exchange membrane fuel cell |
| Author | Institution |
| WANG Jun-bin |
State Key Laboratory of Powder Metallurgy, Central South University, Changsha , China |
| XIE Zhi-yong |
State Key Laboratory of Powder Metallurgy, Central South University, Changsha , China |
| GAO Ping-ping |
State Key Laboratory of Powder Metallurgy, Central South University, Changsha , China |
| WU Xiao-bo |
State Key Laboratory of Powder Metallurgy, Central South University, Changsha , China |
| TAO Tao |
State Key Laboratory of Powder Metallurgy, Central South University, Changsha , China |
| OUYANG Tao |
State Key Laboratory of Powder Metallurgy, Central South University, Changsha , China |
| HUANG Qi-zhong |
State Key Laboratory of Powder Metallurgy, Central South University, Changsha , China |
|
| Hits: |
| Download times: |
| Abstract: |
| The work aims to improve corrosion resistance of Ti alloy plate. Two-step hydrothermal impregnation method was adopted to prepare GO-PTFE-C composite coating on Ti bipolar plates. 0.1 mol/L glucose solution was used as carbon source to prepare carbon coating in a reaction still after 170 ℃ + 10 h hydrothermal impregnation treatment. The as-received coating was subsequently impregnated with 5wt.% polytetrafluoroethylene (PTFE) solution containing different amount of graphene oxide (GO) and treated at 350 ℃. Fourier Transform infrared spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) were applied to characterize the surface morphology and composition of coating. Besides, by electrochemical workstation (CHI 660e), a 3-compartment cell was configured to characterize the electrochemical performances of bipolar plates before/after surface modification, and test corrosion performances in environment simulating Proton Exchange Membrane Fuel Cell (PEMFC). Compared with single carbon coating, GO-PTFE surface had more C==O functional groups. At the same time, the induction effect of F on the surface of polytetrafluoroethylene and oxygen atom electron cloud containing oxygen functional groups could obviously improve the adhesion of the coating. Corrosion current density and contact angle of the coating impregnated with 5 wt.% PTFE + 3 g/L GO were 0.008 μA/cm2 and 103.6°, respectively. At the same time, the constant current polarization test (0.6 V and –0.1 V) showed that the corrosion current density of the coating was less than 1 μA/cm2. Therefore, the Titanium-based bipolar plates prepared by impregnating GO and PTFE with carbon coatings shows great potential of application in the bipolar plate of PEMFC. |
| Close |
|
|
|