ABSTRACT

The authors have demonstrated that incorporation of poly(ethyleneimine) (PEI) coated polyaniline-silica (PANI-SiO₂) particles into the zinc coating matrix improves the corrosion resistance of low carbon steel in a 5% NaCl solution compared to the bare zinc coating. The zinc and hybrid coatings were electrodeposited on a steel cathode surface at pH 5.5 when PANI manifests itself as non-conductive emeraldine base. Scanning electron microscopy showed that the hybrid coating consists of particle agglomerates in size 50–100 μm, mixed with smooth formations and smaller needle-like particles. The influence of PEI is suggested to cause the appearance of the smooth formations. The influence of PANI-SiO₂ particles on the cathodic deposition and anodic dissolution has been checked with cyclic voltammetry. The protective properties of the coatings were characterised by potentiodynamic polarisation and polarisation resistance studies. X-ray diffraction and X-ray photoelectron spectroscopy were also applied to investigate the metallographic structure and chemical composition of the coatings.

摘要

作者已经证明，与裸锌涂层相比，将聚（乙烯亚胺）（PEI）涂覆的聚苯胺 - 二氧化硅（PANI-SiO ₂）颗粒掺入锌涂层基质中可提高低碳钢在 5% NaCl 溶液中的耐腐蚀性. 当 PANI 表现为不导电的祖母绿基时，锌和混合涂层在 pH 值为 5.5 的钢阴极表面上电沉积。扫描电子显微镜显示混合涂层由大小为 50-100 μm 的颗粒团聚体组成，混合有光滑的结构和较小的针状颗粒。建议 PEI 的影响导致平滑地层的出现。PANI-SiO ₂的影响阴极沉积和阳极溶解上的颗粒已经用循环伏安法检查过。通过动电位极化和极化电阻研究表征了涂层的保护性能。X射线衍射和X射线光电子能谱也被用于研究涂层的金相结构和化学成分。