The aim of this research is to explore the effectiveness of epoxy-resin@polypyrole composites as a corrosion inhibitor when applied as a coating on carbon steel 1018 in a 3.5 wt % sodium chloride electrolyte solution. The anticorrosion properties of these composite coatings can be optimized by manipulating their morphology. To investigate how modifications in the structure of epoxy resin coatings impact their ability to inhibit corrosion, three distinct forms of polypyrrole nanoparticles/indigo carmine structures, including granular, rod-shaped, and spiral rods, were synthesized and incorporated into epoxy resin coatings for analysis. Various characterization techniques, including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM), Brunauer–Emmett–Teller (BET), Fourier transform infrared spectroscopy (FT-IR), and vibrating-sample magnetometer (VSM) analysis, were utilized to examine the structures of polymer nanoparticles. The FESEM images displayed that the indigo carmine concentration changes during micellar polymerization led to morphological changes in the polymer nanoparticles. Furthermore, electrochemical assessment methods such as Tafel analysis and electrochemical impedance spectroscopy (EIS) verified a reduction in corrosion current and enhancement in resistance due to the transformation of polymer nanoparticles from granular to spiral rods, leading to 99.99% corrosion inhibition. The corrosion rate of polymer nanoparticles varies significantly with their structure, exhibiting a rate of 1.9 × 10^–6 for granular forms, 4.08 × 10^–7 for rod-shaped structures, and 3.45 × 10^–10 for spiral rods. In the next step, the self-healing properties of the scratched coating loaded by the spiral rod polymer nanoparticles were investigated by FESEM, UV–vis microscope images, energy-dispersive X-ray spectroscopy (EDX), EIS, and Tafel tests. The ability of polypyrrole and indigo carmine to inhibit corrosion, physically adhere to the metal surface, and create iron-indigo carmine complexes allows for the creation of a protective coating on carbon steel surfaces.

中文翻译：

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碳钢 1018 在盐水环境中聚吡咯和靛蓝胭脂红复合材料的形貌依赖性腐蚀抑制和自修复性能


本研究的目的是探讨环氧树脂resin@polypyrole复合材料在 3.5 wt % 氯化钠电解质溶液中作为碳钢 1018 涂层时作为缓蚀剂的有效性。这些复合涂层的防腐性能可以通过控制其形态来优化。为了研究环氧树脂涂层结构的改性如何影响其抑制腐蚀的能力，合成了三种不同形式的聚吡咯纳米颗粒/靛蓝胭脂红结构，包括颗粒状、棒状和螺旋棒状，并将其掺入环氧树脂涂层中进行分析。各种表征技术，包括 X 射线衍射 （XRD）、X 射线光电子能谱 （XPS）、场发射扫描电子显微镜 （FESEM）、Brunauer-Emmett-Teller （BET）、傅里叶变换红外光谱 （FT-IR） 和振动样品磁强计 （VSM） 分析，用于检查聚合物纳米颗粒的结构。FESEM 图像显示，胶束聚合过程中靛蓝胭脂红浓度的变化导致聚合物纳米颗粒的形态变化。此外，塔菲尔分析和电化学阻抗谱 （EIS） 等电化学评估方法证实，由于聚合物纳米颗粒从颗粒转变为螺旋棒，腐蚀电流降低，电阻增强，腐蚀抑制率达到 99.99%。聚合物纳米颗粒的腐蚀速率随其结构变化很大，颗粒形式的腐蚀速率为 1.9 × ^10-6，棒状结构为 4.08 × ^10-7，螺旋棒为 3.45 × ^10-10。 下一步，通过 FESEM、紫外-可见显微镜图像、能量色散 X 射线光谱 （EDX）、EIS 和 Tafel 测试研究了螺旋棒聚合物纳米颗粒负载的划痕涂层的自修复特性。聚吡咯和靛蓝胭脂红抑制腐蚀、物理粘附在金属表面并产生铁-靛蓝胭脂红络合物的能力允许在碳钢表面形成保护涂层。