Anticorrosion Performance of Epoxy Coating Containing Polyaniline Modified by Montmorillonite in Marine Environment
摘 要
为提高海洋环境环氧(EP)涂层长效防腐蚀性能,选用蒙脱土(Mt)聚苯胺(PANI)复合物对环氧涂层进行改性,研究其耐蚀性能与机理。首先采用化学氧化法制备PANI和四种不同Mt含量的PANI 复合物,然后以EP为成膜物质,在Q235钢上制备不同含量PANI-Mt100∶7的环氧复合涂层,通过红外光谱(FTIR),X射线衍射(XRD),扫描电镜(SEM)对PANI、PANI-Mt微观结构和形貌进行研究并利用电化学方法研究复合环氧涂层在3.5% NaCl溶液中的腐蚀性能与机理。结果表明: 改性环氧涂层在浸泡0.5 h和360 h时的阻抗值分别为8.7×106 Ω·cm2和6.3×104 Ω·cm2,而掺入PANI-Mt100∶7后环氧涂层阻抗值明显增大,当PANI-Mt100:∶7掺入量为5%(质量分数)时,环氧涂层在浸泡0.5 h和360 h时的阻抗值最大,分别为2.7×108 Ω·cm2和1.1×107 Ω·cm2。
Abstract
In order to improve the long-term anticorrosion performance of epoxy (EP) coating in marine environment, montmorillonite (Mt) and polyaniline (PANI) compounds were applied to modify epoxy resin coatings (EP), and the corrosion properties and mechanism of the compounds were studied. PANI and 4 kinds of PANI conpounds with different contents of Mt were prepared by chemical oxidation method. Composite coatings of EP with different contents of PANI-Mt100:7 were coated on Q235 steel substrate. Microstructure and morphology of PANI and PANI-Mt products were characterized by fourier transform infrared spectroscopy (FTIR), X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM) respectively. The corrosion performance of Q235 steel with different composite EP coatings in 3.5% sodium chloride (NaCl) solution was studied by electrochemical methods. The results indicated that the impedance values of the modifield EP coating after immersion for 0.5 h and 360 h were 8.7×106 Ω·cm2 and 6.3×104 Ω·cm2 respectively. The impedance values of the modifield EP after immersion for 0.5 h and 360 h increased obviously after adding PANI-Mt100:7, which reached the maximal value of 2.7×108 Ω·cm2 and 1.1×107 Ω·cm2, as the content of PANI-Mt100:7 was 5%.
中图分类号 TG174.46 DOI 10.11973/fsyfh-201603007
所属栏目 试验研究
基金项目 国家自然科学基金(51301061)
收稿日期 2015/9/6
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联系人作者李保松(lbs79@126.com)
备注李保松(1979-),副教授,博士,从事高性能防腐蚀涂层和表面处理研究,
引用该论文: ZHANG Lei,LI Bao-song,ZHANG Wen. Anticorrosion Performance of Epoxy Coating Containing Polyaniline Modified by Montmorillonite in Marine Environment[J]. Corrosion & Protection, 2016, 37(3): 215
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【2】OLAD A,NASERI B. Preparation,characterization and anticorrosive properties of a novel polyaniline/clinoptilolite nanocomposite[J]. Progress in Organic Coatings,2010,67(3):233-238.
【3】BHADRA S,KHASTGIR D,NIKHIL K S,et al. Progress in preparation,processing and applications of polyaniline[J]. Progress in Polymer Science,2009,34(8):783-810.
【4】GE C Y,YANG X G,HOU B R. Synthesis of polyaniline nanofiber and anticorrosion property of polyaniline-epoxy composite coating for Q235 steel[J]. Journal of Coatings Technology and Research,2011,9(1):59-69.
【5】LIU C X,ZHOU Y Y,LI S,et al. Preparation and characterization of polyaniline/MMT conductive composites[J]. Polymers for Advanced Technologies,2008,19(12):1693-1697.
【6】LU J,ZHAO X P. Electrorheological properties of a polyaniline-montmorillonite clay nanocomposite suspension[J]. Journal of Materials Chemistry,2002,12(9):2603-2605.
【7】KIM B H,JUNG J H,KIM J W,et al. Physical characterization of polyaniline Na+ montmorillonite nanocomposite intercalated by emulsion polymerization[J]. Synthetic Metals,2001,117(1/3):115-118.
【8】侯文鹏,葛子义,赵文元. 高氯酸掺杂聚苯胺/环氧涂层对Q235碳钢防腐蚀性能的影响[J]. 腐蚀科学与防护技术,2013,25(2):121-126.
【9】SOUNDARARAJAH Q Y,KARUNARATNE B S B,RAJAPAKSE R M G. Montmorillonite polyaniline nanocomposites:preparation,characterization and investigation of mechanical properties[J]. Materials Chemistry and Physics,2009,113(2/3):850-855.
【10】AKBARINEZHAD E,EBRAHIMI M,SHARIF F,et al. Synthesis and evaluating corrosion protection effects of emeraldine base PAni/clay nanocomposite as a barrier pigment in zinc-rich ethyl silicate primer[J]. Progress in Organic Coatings,2011,70(1):39-44.
【11】张颖君,冯涛,绍亚微,等. 聚苯胺/环氧涂层对AZ91D镁合金耐蚀性能的影响[J]. 中国腐蚀与防护学报,2010,30(4):283-294.
【12】陈兴娟,沈科金. 镁锂合金表面含聚苯胺复合涂层的防腐性能研究[J]. 腐蚀科学与防护技术,2009,21(4):384-387.
【13】高焕方,张胜涛,刘通,等. 聚苯胺对环氧涂层耐蚀性能的影响[J]. 腐蚀与防护,2009,30(4):267-269.
【14】MACDIARMID A G,MU S L,SOMASIRI N L D. Electrochemical characteristics of polyaniline cathodes anodes in a aqueous electrolytes[J]. Molecular Crystals and Liquid Crystals,1985,121(5):187-190.
【15】刘艳花,肖利,方正,等. 高氯酸掺杂聚苯胺的合成及其电化学性能[J]. 湖南师范大学自然科学学报,2011,34(2):61-63.
【16】XING C J,ZHANG Z M. Anti-corrosion performance of nanostructured poly (aniline-co-metanilic acid) on carbon steel[J]. Progress in Organic Coatings,2013,77:354-360.
【17】KINLEN P J,SILVERMAN D C,JEFFREYS C R. Corrosion protection using polyaniline coating formulations[J]. Synthetic Metals,1997,101(1/3):1327-1332.
【18】PIROMRUEN P,KONGPARAKUL S,PRASASSARAKICH P. Synthesis of polyaniline/montmorillonite nanocomposites with an enhanced anticorrosive performance[J]. Progress in Organic Coatings,2014,77(3):691-700.
【19】RADHAKRISHNAN S,SONAWANE N,SIJU C R. Epoxy powder coatings containing polyaniline for enhanced corrosion protection[J]. Progress in Organic Coatings,2009,64(4):383-386.
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