摘要
采用恒电流法、恒电流阶跃电流法、循环伏安法及自聚合法等4种方法将聚苯胺(PANI)原位沉积在自制的改性石墨(MGE)上,制备出聚苯胺/改性石墨复合材料(PANI/MGE)。利用扫描电镜和红外光谱对PANI/MGE的微观形貌和分子结构进行了表征,利用电化学阻抗谱研究了不同聚合方法所得复合材料的防腐蚀性能。结果表明,4种聚合方法所得复合材料微观形貌与聚合前的改性石墨相似,都呈现平面的片层结构,没有聚合物团簇聚集现象产生。4种聚合方法均能成功实现聚苯胺的原位沉积,聚苯胺与改性石墨之间存在较强的相互作用,且以恒电流阶跃所得复合材料中两者的相互作用最强。5种不同涂层中,恒电流阶跃聚合所得涂层的防腐蚀性能最好,稳定的自腐蚀电位及涂层阻抗最高;循环伏安聚合及恒电流聚合所得两种复合涂层的阻抗及自腐蚀电位均随时间的延长而逐渐下降,涂层很快失效。
Polyaniline（PANi） was in situ deposited on the surface of modified graphite（MGE） via different electrochemical methods to prepare composites of PANi/MGE.Their morphology and microstructure were examined by scanning electron microscopy（SEM） and the Fourier transform infrared spectroscopy（FT-IR）.While their anticorrosion properties were assessed by corrosion potential measurement and electrochemical impedance spectrometry.Experimental results showed that MGE as a support material can provide sufficient reaction sites for the deposition of aniline to form the film-like composites of PANI/MGE.There exists strong interaction at the interface of PANI and MGE.Test results of anticorrosion performance illustrated that among others,the composite of PANI/MGE prepared by polymerization with constant current step technique showed the best corrosion resistance and the highest open circuit potential.
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2017年第5期428-434,共7页
Journal of Chinese Society For Corrosion and Protection
基金
国家自然科学基金(51131005)
山东省优秀中青年科学家奖励基金(BS2012HZ021)~~
