聚苯胺/改性石墨复合材料的电化学制备及其防腐蚀性能研究

doi:10.11902/1005.4537.2016.218

中国腐蚀与防护学报

2017, Vol. 37

Issue (5): 428-434 DOI: 10.11902/1005.4537.2016.218

研究报告

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聚苯胺/改性石墨复合材料的电化学制备及其防腐蚀性能研究

万起展,陈宁宁,杨培培,钟莲(

),王燕华,王佳

中国海洋大学化学化工学院海洋化学理论与工程技术教育部重点实验室青岛 266100

Synthesis and Corrosion Performance of Composites of Polyaniline/Modified Graphite

Qizhan WAN,Ningning CHEN,Peipei YANG,Lian ZHONG(

),Yanhua WANG,Jia WANG

Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdaog 266100, China

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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。

关键词 ：聚苯胺, 活化石墨, 2Cr13不锈钢, 腐蚀

Abstract：

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.

Key words： Polyaniline modified graphite 2Cr13ss corrosion

收稿日期: 2016-11-18

基金资助:国家自然科学基金 (51131005) 和山东省优秀中青年科学家奖励基金 (BS2012HZ021)

作者简介: 万起展,男,1991年生,硕士生

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引用本文:

万起展,陈宁宁,杨培培,钟莲,王燕华,王佳. 聚苯胺/改性石墨复合材料的电化学制备及其防腐蚀性能研究[J]. 中国腐蚀与防护学报, 2017, 37(5): 428-434.
Qizhan WAN, Ningning CHEN, Peipei YANG, Lian ZHONG, Yanhua WANG, Jia WANG. Synthesis and Corrosion Performance of Composites of Polyaniline/Modified Graphite. Journal of Chinese Society for Corrosion and protection, 2017, 37(5): 428-434.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.218 或 https://www.jcscp.org/CN/Y2017/V37/I5/428

图1 MGE和4种不同方法制备的PANI/MGE复合材料及PANI的SEM像

图2 MGE及PANI/MGE的红外光谱

图3 涂覆PANI/MGE和MGE的2Cr13不锈钢电极在1 mol/L H2SO4溶液中浸泡不同时间的自腐蚀电位以及阻抗复数平面图

图4 涂覆恒电流阶跃电流聚合涂层的2Cr13不锈钢电极在1 molL-1 H2SO4溶液中腐蚀的等效电路

图5 涂覆恒电流阶跃聚合涂层和MGE涂层的不锈钢电极在1 molL-1 H2SO4溶液中浸泡不同时间后的电化学阻抗谱及其拟合结果

表1 涂覆恒电流阶跃聚合涂层的不锈钢电极在1 molL-1 H2SO4溶液中腐蚀时的等效电路中各电器元件的值

表2 MGE涂层在1 molL-1 H2SO4溶液中腐蚀时的等效电路中各电器元件的值

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