聚苯胺/磷化含氟丙烯酸酯复合乳胶涂层的防腐蚀性能

Anticorrosion Properties of PANI/Phosphate-Fluorocarbon Acrylate Composite Emulsion Coatings

摘要:

以十二烷基硫酸钠（SDS）为乳化剂和掺杂剂，采用化学氧化聚合法合成一种稳定的聚苯胺（PANI）乳液，同时合成磷化含氟丙烯酸酯（P-FAc）乳液，将两种乳液以不同的比例复合制备复合乳胶涂层。通红外光谱表征了PANI和P-FAc的结构；通过接触角、附着力、极化曲线、开路电位和电化学阻抗谱测试了复合涂层对Q235钢的防腐蚀性能；通过扫描电子显微镜观察了揭掉PANI/P-FAc复合涂层后的Q235钢表面形貌。结果表明，当PANI乳液与P-FAc乳液的比为1:1时，复合涂层的性能最佳，其腐蚀电流密度仅为1.09?0-6/cm2，平衡电位为-0.55V，阻抗为104.3Ω。

Abstract:

A kind of steady polyaniline (PANI) emulsion was prepared in this paper by chemical oxidative polymerization with SDS as emulsi?er and dopant. The phosphate-fluorocarbon acrylate (P-FAc) emulsion was also prepared. And the composite emulsion coatings of PANI/P-FAc was obtained by adding different proportions of PANI emulsion into P-FAc emulsion. The chemical structure of PANI and P-FAc were characterized by Fourier transform infrared spectroscopy. The contact angle, adhesion, potentiodynamic polarization curves, open circuit potential and electrochemical impedance spectroscopy were used to assess the anticorrosion properties of the PANI/P-FAc coatings for Q235 steel. The surface morphology of Q235 steel which removed PANI/P-FAc coating were observed by scanning electron microscope. The results showed that the coating has the best anticorrosion properties when the proportion of P-FA emulsion and PANI emulsion was 1:1. The corrosion current density was only 1.09?0-6 A/cm2, the equilibrium potential was -0.55V, and the impedance modulus reached 104.3Ω.