聚苯胺/纳米Al_2O_3复合材料的制备及其防腐性能研究

Preparation of Polyaniline/Nano-Al_2O_3 Composite and Study on Its Anticorrosive Performance

在纳米Al_2O_3粒子存在的情况下,以苯胺单体为原料,过硫酸铵为氧化剂,采用化学氧化聚合法制备了聚苯胺/纳米Al_2O_3,复合物。分别用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、紫外-可见分光光度计(UV-vis)和傅里叶变换红外光谱(FTIR)对产物进行形貌观察和结构表征。将涂覆含有聚苯胺和聚苯胺/纳米Al_2O_3,复合物涂层的碳钢片,浸泡于质量分数为3.5%的NaCl溶液中,通过开路电位、极化曲线和交流阻抗来评价涂层的防腐性能。结果表明,涂层中含有聚苯胺/纳米Al_2O_3复合物的碳钢片抗腐蚀能力强于含聚苯胺的碳钢片,腐蚀电位最高,腐蚀电流密度最小;而裸钢片腐蚀电位最小,腐蚀电流密度最大。

In the presence of A1203 nanoparticles, with aniline monomer as raw materials, ammonium persulfate as the oxidant, polyaniline/nano-A12 03 composite was prepared by chemical oxidation polymerization. The morphology and structure of the product was characterized by SEM, XRD, UV-vis and IR. The carbon steel pieces coated with polyaniline and polyaniline/nano-A12 03 composite coating was soaked in the mass fraction of 3.5% NaC1 solution, by open circuit potential, polarization curves and electrochemical impedance, the anticorrosion performance of the coating was evaluated. The experimental results showed that： coating containing polyaniline/nano-A1203 composite of carbon steel piece＇s corrosion resistance was stronger than containing polyaniline, with the highest corrosion potential and the minimum corrosion current density ; but the bare steel piece＇s corrosion potential was the minimum and the corrosion current density was the maximum.