聚苯胺/聚吡咯-纳米二氧化硅复合薄膜的合成及防腐性能

Synthesis and Anti-corrosion Properties of Polyaniline / Polypyrrole-nano Silicon Dioxide Composite Membrane

采用循环伏安法(CV)在316不锈钢(316SS)表面聚合生成聚苯胺/聚吡咯-纳米二氧化硅(PAni/PPySiO_2)共聚复合薄膜.通过电化学工作站、傅里叶变换红外光谱仪(FTIR)、X射线光电子能谱仪(XPS)和扫描电子显微镜(SEM)等考察了聚苯胺(PAni)、聚苯胺/聚吡咯(PAni/PPy)与PAni/PPy-SiO_2薄膜的电化学聚合过程、分子结构和特征形貌;在3.5%(质量分数)Na Cl水溶液中利用Tafel极化曲线和电化学阻抗谱(EIS)分别考察了PAni,PAni/PPy与PAni/PPy-SiO_2薄膜对不锈钢的防腐性能.结果表明,通过电化学法可以在316不锈钢表面生成PAni/PPy-SiO_2共聚复合薄膜;相对于PAni薄膜与PAni/PPy薄膜,PAni/PPy-SiO_2薄膜有着更密实的表面结构,其对不锈钢的保护能力优于PAni/PPy薄膜和PAni薄膜,纳米SiO_2的掺杂通过加强膜层的机械屏蔽作用并抑制腐蚀反应过程中电荷的传递,提高了薄膜的防腐能力.

In this article,polyaniline / polypyrrole-nanosilicon dioxide（ PAni / PPy-SiO2） composite membrane was prepared by cyclic voltammetry（ CV） method on the surface of 316 stainless steel（ 316SS）. The electrochemical polymerization process,structural and morphological characteristics of polyaniline（ PAni）,polyaniline / polypyrrole（ PAni / PPy） and PAni / PPy-SiO2 membranes were investigated by cyclic voltammetry（ CV）,Fourier transform infrared spectroscopy（ FTIR）,X-ray photoelectron spectroscopy（ XPS） and scanning electron microscopy（ SEM）,respectively. The antiseptic properties of PAni,PAni / PPy and PAni / PPy-SiO2 membranes to stainless steel were studied by the Tafel polarization curve and electrochemical impedance spectroscopy（ EIS） in 3. 5%（ mass fraction） Na Cl aqueous solution. The results show that PAni / PPy-SiO2 composite membrane can form on the surface of 316 stainless steel by electrochemical process. Compared with PAni and PAni / PPy membranes,PAni / PPy-SiO2 composite membrane has tighter surface structure. The metal protection ability of PAni / PPy-SiO2 is better than those of PAni / PPy and PAni membranes. The anti-corrosion ability of membrane is improved because of the strengthening mechanical shielding effect of membrane with nano SiO2 and the inhibition of charge transfer during the corrosion reaction process.