Kawsihan Anoja, Dissanayake D M S N, Rathuwadu N P W, Perera H C S, Dayananda K E D Y T, Koswattage K R, Mahadeva Rajesh, Ganguly Arnab, Das G, Mantilaka M M M G P G
Academy of Sri Lanka Institute of Nanotechnology, Nanotechnology and Science Park Mahenwatte, Pitipana Homagama Sri Lanka.
Sri Lanka Institute of Nanotechnology, Nanotechnology and Science Park Mahenwatte, Pitipana Homagama Sri Lanka.
RSC Adv. 2023 Oct 2;13(41):28852-28860. doi: 10.1039/d3ra02857g. eCollection 2023 Sep 26.
We synthesised a polyaniline/mica (Mica-PANI) nanocomposite using naturally occurring muscovite mica by a top-down approach. The developed coating materials were characterised using a different technique to investigate their chemical and structural properties using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA). Furthermore, the electrochemical properties of the coating materials were investigated by linear sweep voltammetry (LSV). SEM images elucidate the composite's average particle diameter of the prepared nano-mica, approximately 80 nm. The existence of relevant functional groups and bonding in the prepared Mica-PANI composite material was confirmed by means of XPS and FTIR techniques. Moreover, the synthesised composite with 5% w/w shows high anticorrosion protection, 84 μm per year, compared to competing materials, including commercial paint and individual raw materials (0.35 mm per year). The anti-corrosive effect occurs mainly due to two opposing effects: the formation of an Fe(OH) passive layer on the steel surface by oxidation of surface iron atoms by the PANI and the barrier effect of mica NPs through inhibition of corrosive agents. Therefore, the eco-inspired composite could be an ideal cost-effective coating material to prevent the corrosion of mild steel surfaces.
我们采用自上而下的方法，利用天然白云母合成了聚苯胺/云母（云母 - 聚苯胺）纳米复合材料。使用傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、扫描电子显微镜（SEM）、X射线光电子能谱（XPS）和热重分析（TGA）等不同技术对所制备的涂层材料进行表征，以研究其化学和结构性质。此外，通过线性扫描伏安法（LSV）研究了涂层材料的电化学性质。SEM图像显示，制备的纳米云母复合材料的平均粒径约为80nm。通过XPS和FTIR技术证实了所制备的云母 - 聚苯胺复合材料中存在相关官能团和化学键。此外，与包括商业涂料和单一原材料（每年0.35mm）在内的竞争材料相比，合成的5% w/w复合材料显示出高防腐性能，每年84μm。防腐效果主要源于两种相反的作用：聚苯胺使表面铁原子氧化在钢表面形成Fe(OH)钝化层，以及云母纳米粒子通过抑制腐蚀剂产生的阻隔效应。因此，这种受生态启发的复合材料可能是防止低碳钢表面腐蚀的理想且具有成本效益的涂层材料。
