摘要：本論文研究了導電聚合物涂層作為交換膜燃料電池(PEMFC)銅雙極板的表面抗腐蝕涂層的抗腐蝕性能，對比研究了以對甲苯磺酸(ToSH)為摻雜劑的吡咯溶液以及沒有摻雜劑的吡咯溶液中，采用循環伏安法在銅電極表面聚合得到聚吡咯(Ppy)涂層。討論了摻雜劑的用量，結果表明在摻雜0.1MToSH的0.2MPpy+0.2MH2C2O4電沉積溶液中效果最佳。采用紅外光譜(IR)、掃描電子顯微鏡(SEM)等表面分析方法對導電聚合物涂層特征進行表征，表明摻雜Ppy涂層由小顆粒緊密排列而成，外觀光亮、平整。未摻雜Ppy涂層局部致密但不平整，出現少量空隙與裂縫。采用動電位極化、開路電位-時間曲線以及電化學阻抗譜(EIS)等電化學測量技術評價所制涂層的耐蝕性能，表明兩種方法制備的Ppy涂層對銅基體都有很好的防護性能，其中未摻雜Ppy涂層使得銅基體自腐蝕電位正移了61mV，腐蝕電流密度從10-4A/cm2下降到10-5A/cm2；而摻雜Ppy膜使得基體自腐蝕電位正移了76mV，腐蝕電流密度從10-4A/cm2下降到10-5A/cm2。這是由于未摻雜涂層存在微缺陷，而摻雜涂層相對致密，涂層對基體的保護時間更長，耐蝕性能更好。

關鍵詞： 聚吡咯，對甲苯磺酸，摻雜，腐蝕

Abstract:In this research, corrosion resistance of the conductive polymer coating as the surface anti-corrosion coating of the copper bipolar plate of the exchange membrane fuel cell (PEMFC) was studied, comparing the pyrrole solution  with  p-toluenesulfonic acid (ToSH) pyrrole as the dopant with the pyrrole solution  without  p-toluenesulfonic acid (ToSH) pyrrole. The poly pyrrole coating of the surface of the copper electrode was got by using the cyclic voltammetry polymerization . The amount of dopant was discussed. It was resulted that 0.2Mpy +0.2 MH2C2O4 power deposition solution with 0.1MtoSH was the best . the conductive polymer coating characteristics were characterized by Infrared spectroscopy (IR), scanning electron microscopy (SEM) and other surface analysis methods . It showed that the coating doping PPy was consisted of closely arranged small particles in bright and smooth appearance. The coating undoping PPy was dense locally but not flat. A little of gaps and cracks were appeared . By using the electrochemical measurements techniques , such as potentiodynamic polarization, open circuit potential - time curves and electrochemical impedance spectroscopy (EIS) , the corrosion resistance of the coating was evaluated.  It showed that Ppy coating ,Prepared by two methods has a good protective performance to the copper substrate. The corrosion potential of the copper substrate with Undoped Ppy coating shifted 61mV positively, and the corrosion current density decreased from 10-4A/cm2 to 10-5A/cm2. The corrosion potential of the substrate with the Ppy membrane, synthesized by cyclic voltammetry, shifted 76mV positively, the corrosion current density decreased from 10-4A/cm2 to 10-5A/cm2. This is due to that the undoped coating has the micro-defects , while the doped coating is relatively dense, the protection time of coating on the substrate is longer, and corrosion resistance is better.

Key words : Ppy, ToSH, Doping, Corrosion