柠檬酸掺杂聚苯胺/硅溶胶复合涂层的防腐性能研究

Anticorrosion Properties of Citric Acid Doped Composite Coatings of Polyaniline/silicon Sol

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.