柠檬酸掺杂聚苯胺/硅溶胶复合涂层的防腐性能研究
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摘要
以柠檬酸(CA)为掺杂剂通过化学氧化法合成了一种掺杂态的聚苯胺(PANI-CA),并将合成的PANICA混入溶胶凝胶法制备的硅溶胶中,刷涂在Q235钢表面制备复合防腐涂层。采用红外光谱(FTIR)表征了PANI-CA和硅溶胶的结构;研究了PANI-CA含量对复合涂层疏水性、附着力及防腐性能的影响;阐述了复合涂层的防腐机理。结果表明:当PANI-CA含量为4%时,得到的复合涂层表现出较好的疏水性和防腐性能,其水接触角为115.4°,吸水率为5.84%;由极化曲线拟合得到的腐蚀电流密度为2.34×10-7A·cm-2,电化学阻抗值达到106Ω·cm~2。
A kind of doped polyaniline(PANI-CA) was synthesized with citric acid(CA) as dopant by using chemical oxide method. After mixed with silicon sol which prepared by sol-gel method, it was applied to the surface of Q235 steel to prepare anticorrosion composite coatings. The structure of PANI-CA and silicon sol was characterized by Fourier transform infrared spectrum(FTIR). The influence of different content of PANI-CA on the hydrophobicity, adhesion and anticorrosion performance of the composite coatings were investigated. Results showed that the composite coating with 4% PANI-CA presented better hydrophobic and anticorrosion properties with such as contact angle 115.4° to water, water absorption5.84%, corrosion current density 2.34×10-7 A·cm-2 and electrochemical impedance value up to 106Ω·cm~2.
A kind of doped polyaniline(PANI-CA) was synthesized with citric acid(CA) as dopant by using chemical oxide method. After mixed with silicon sol which prepared by sol-gel method, it was applied to the surface of Q235 steel to prepare anticorrosion composite coatings. The structure of PANI-CA and silicon sol was characterized by Fourier transform infrared spectrum(FTIR). The influence of different content of PANI-CA on the hydrophobicity, adhesion and anticorrosion performance of the composite coatings were investigated. Results showed that the composite coating with 4% PANI-CA presented better hydrophobic and anticorrosion properties with such as contact angle 115.4° to water, water absorption5.84%, corrosion current density 2.34×10-7 A·cm-2 and electrochemical impedance value up to 106Ω·cm~2.
引文
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[11]Arefinia R,Shojaei A,Shariatpanahi H,et al.Anticorrosion properties of smart coating based on polyaniline nanoparticles/epoxy-ester system[J].Prog.Org.Coat.,2012,75:502
[2]Bagherzadeh M R,Mahdavi F,Ghasemi M,et al.Using nanoemeraldine salt-polyaniline for preparation of a new anticorrosive waterbased epoxy coating[J].Prog.Org.Coat.,2010,68:319
[3]Akbarinezhad E,Ebrahimi M,Sharif F,et al.Comparative assessing on corrosion protection effects of zinc rich ethyl silicate primers modified with undoped and HCl doped Pani-clay nanocomposite[J].Corros.Eng.Sci.Technol.,2011,46:777
[4]Ebrahimi G,Neshati J,Rezaei F.An investigation on the effect of H3PO4and HCl-doped polyaniline nanoparticles on corrosion protection of carbon steel by means of scanning kelvin probe[J].Prog.Org.Coat.,2017,105:1
[5]Li X B,Xu L,Liu Y H,et al.Preparation and corrosion properties of polyaniline doped with copper phthalocyanine disulfonic acid[J].J.Chin.Soc.Corros.Prot.,2016,36:306(李小宝,徐利,刘怡宏等.酞菁铜二磺酸改性聚苯胺的制备及耐蚀性能[J].中国腐蚀与防护学报,2016,36:306)
[6]Rajasekharan V,Stalin T,Viswanathan S,et al.Electrochemical evaluation of anticorrosive performance of organic acid doped polyaniline based coatings[J].Int.J.Electrochem.Sci.,2013,8:11327
[7]Kendig M,Hon M,Warren L.'Smart'corrosion inhibiting coatings[J].Prog.Org.Coat.,2003,47:183
[8]Seegmiller J C,Da Silva J E P,Buttry D A,et al.Mechanism of action of corrosion protection coating for AA2024-T3 based on poly(aniline)-poly(methylmethacrylate)blend[J].J.Electrochem.Soc.,2005,152:B45
[9]Kong G,Wu S,Lu J T,et al.Status of research and application of citric acid and citrate in metal protection[J].Electroplat.Finish.,2011,30(11):53(孔纲,吴双,卢锦堂等.柠檬酸及其盐在金属防护中的应用研究现状[J].电镀与涂饰,2011,30(11):53)
[10]Lim G H,Choi H J.Synthesis of self-assembled rectangularshaped polyaniline nanotubes and their physical characteristics[J].J.Ind.Eng.Chem.,2017,47:51
[11]Arefinia R,Shojaei A,Shariatpanahi H,et al.Anticorrosion properties of smart coating based on polyaniline nanoparticles/epoxy-ester system[J].Prog.Org.Coat.,2012,75:502