纳米ZnS增强聚苯胺复合涂层的性能研究

doi:10.11902/1005.4537.2015.137

中国腐蚀与防护学报

2016, Vol. 36

Issue (3): 273-280 DOI: 10.11902/1005.4537.2015.137

研究报告

本期目录 | 过刊浏览

纳米ZnS增强聚苯胺复合涂层的性能研究

钱超^1,²,云虹¹(

),张志国¹,徐群杰¹

1. 上海电力学院环境与化学工程学院上海 200090
2. 上海电力学院上海市电力材料防护与新材料重点实验室上海 200090

Anticorrosive Performance of Nano ZnS Reinforced Polyaniline Coatings on Q235 Carbon Steel

Chao QIAN^1,²,Hong YUN¹(

),Zhiguo ZHANG¹,Qunjie XU¹

1. College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
2. Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China

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摘要:

采用水热法制备纳米ZnS,与化学氧化法制备的聚苯胺 (PANI) 按不同比例混合,制得纳米ZnS改性PANI复合物,将其涂覆于Q235碳钢表面制备复合涂层。采用SEM,AFM,XRD和FTIR表征纳米ZnS改性PANI复合涂层的表面形貌和结构,利用动电位极化和EIS研究复合涂层浸泡在3.5% (质量分数) NaCl溶液中的腐蚀电化学行为。结果表明,纳米ZnS改性PANI复合涂层中ZnS和PANI二者均匀分散,显著提高其耐蚀性能。当ZnS和PANI的质量比为1:1时,性能最优,在3.5%NaCl溶液中浸泡7 d,复合涂层的保护效率高达99.9%;浸泡30 d后复合涂层的表面形貌发生变化,仍为致密的保护膜,对基底材料具有较好的保护作用,使其免受溶液离子的侵蚀。

关键词 ：聚苯胺, 纳米ZnS, 分散, 腐蚀防护

Abstract：

Nano-ZnS was prepared by hydrothermal method and polyaniline was prepared by chemical oxidation respectively, which then were blended to prepare a series composite materials of polyaniline modified by nano-ZnS. Finally the relevant composite coatings were applied on Q235 carbon steel. The acquired composite materials and coatings were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM) and X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The electrochemical corrosion performance of the composite coatings in 3.5% (mass fraction) NaCl solution was investigated by potentiodynamic polarization and electrochemical impedance. The results showed that the nano-ZnS was uniformly dispersed in the polyaniline matrix and therewith the anticorrosive performance of the coatings was improved significantly. Among others the coating with 50% (mass fraction) ZnS exhibited the best anticorrosive performance with a protection efficiency 99.9% after immersion in 3.5%NaCl solution for 7 d. Besides, after immersion for 30 d, the coating surface morphology changed obseriously, but the coating is still dense and could provide good protectiveness for the substrate material even up to 30 d.

Key words： polyaniline nano-ZnS disperse corrosion protection

收稿日期: 2015-09-24

基金资助:国家自然科学基金项目(21003089),上海市教委科创项目 (13YZ103) 和上海市科学技术委员会项目(14DZ2261000)资助

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引用本文:

钱超,云虹,张志国,徐群杰. 纳米ZnS增强聚苯胺复合涂层的性能研究[J]. 中国腐蚀与防护学报, 2016, 36(3): 273-280.
Chao QIAN, Hong YUN, Zhiguo ZHANG, Qunjie XU. Anticorrosive Performance of Nano ZnS Reinforced Polyaniline Coatings on Q235 Carbon Steel. Journal of Chinese Society for Corrosion and protection, 2016, 36(3): 273-280.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2015.137 或 https://www.jcscp.org/CN/Y2016/V36/I3/273

图1 纳米ZnS,PANI和纳米ZnS/PANI复合材料的XRD谱

图2 纳米ZnS,PANI和纳米ZnS/PANI复合材料的FTIR谱

图3 纳米ZnS的AFM像和粒径分布图

图4 PANI及50%-ZnS/PANI在3.5%NaCl溶液中浸泡30 d前后的SEM像

图5 不同样品在3.5%NaCl溶液中浸泡7和30 d后的动电位极化曲线

表1 不同样品在3.5%NaCl溶液中浸泡7 d后的电化学参数及相应的保护效率

图6 不同涂层在3.5%NaCl溶液中的开路电位随浸泡时间的变化

图7 不同涂层在3.5%NaCl溶液中浸泡不同时间后的Nyquist图

图8 Q235碳钢的Bode图和50%-ZnS/PANI复合涂层在不同浸泡时间下的Bode图

表2 涂覆不同涂层的Q235碳钢电极在3.5%NaCl溶液中浸泡30 d后的阻抗拟合参数

图9 涂覆不同涂层的Q235碳钢试样的Rc和Cc随时间的变化曲线

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