Li Bo, Yang Huibing, He Jinhang, Yu Siwu, Xiao Rengui, Luo Huanhu, Wen Yi, Peng Shengyan, Liao Xia, Yang Daning
Electric Power Research Institute of Guizhou Power Grid Co., Guiyang 550002, China.
College of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China.
Materials (Basel). 2023 Feb 28;16(5):2015. doi: 10.3390/ma16052015.
This work demonstrated a workable approach for the synthesis of a re-healing polyaniline-modified epoxy resin coating material via photopolymerization. The prepared coating material exhibited low water absorption, allowing it to be used as an anti-corrosion protective layer for carbon steel. First, graphene oxide (GO) was synthesized through the modified Hummers' method. It was then mixed with TiO to extend its light response range. The structural features of the coating material were identified using scanning electron microscopy (SEM), X ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FT IR). The corrosion behavior of the coatings and the pure resin layer were tested by using electrochemical impedance spectroscopy (EIS) and the potentiodynamic polarization curve (Tafel). The presence of TiO reduced the corrosion potential (E) toward lower values in 3.5% NaCl at room temperature, which was due to the photocathode of titanium dioxide. The experimental results indicated that GO was successfully compounded with TiO and that GO effectively improved the light utilization capacity of TiO. The experiments showed that the presence of local impurities or defects can reduce the band gap energy, resulting in a lower Eg for the 2GO:1TiO composite (2.95 eV) compared to that of TiO alone (3.37 eV). After applying visible light to the coating surface, the change in the Ecorr value of the V-composite coating was 993 mV and the value of I decreased to 1.993 × 10 A/cm. The calculated results showed that the protection efficiency of the D-composite and V-composite coatings on composite substrates was approximately 73.5 and 83.3%, respectively. More analyses revealed that under visible light, the coating had better corrosion resistance. This coating material is expected to be a candidate for carbon steel corrosion protection.
这项工作展示了一种通过光聚合合成可再愈合聚苯胺改性环氧树脂涂层材料的可行方法。制备的涂层材料吸水率低，可作为碳钢的防腐保护层。首先，通过改进的Hummers法合成氧化石墨烯（GO）。然后将其与TiO混合以扩展其光响应范围。使用扫描电子显微镜（SEM）、X射线衍射（XRD）和傅里叶变换红外光谱（FT IR）来确定涂层材料的结构特征。通过电化学阻抗谱（EIS）和动电位极化曲线（Tafel）测试涂层和纯树脂层的腐蚀行为。在室温下，TiO的存在使3.5%NaCl中的腐蚀电位（E）向更低值降低，这是由于二氧化钛的光阴极所致。实验结果表明，GO与TiO成功复合，且GO有效提高了TiO的光利用能力。实验表明，局部杂质或缺陷的存在会降低带隙能量，导致2GO:1TiO复合材料的Eg（2.95 eV）低于单独的TiO（3.37 eV）。在涂层表面施加可见光后，V复合涂层的Ecorr值变化为993 mV，I值降至1.993×10 A/cm。计算结果表明，D复合涂层和V复合涂层在复合基材上的保护效率分别约为73.5%和83.3%。更多分析表明，在可见光下，该涂层具有更好的耐腐蚀性。这种涂层材料有望成为碳钢腐蚀防护的候选材料。
