Anticorrosion Improvement of Waterborne Epoxy-Acrylate Coatings by Constructing g-C3N4 Functionalized by Polyaniline-Coated Zinc Phosphate

聚苯胺 材料科学 磷酸锌 扫描电子显微镜 介电谱 环氧树脂 傅里叶变换红外光谱 复合数 腐蚀 X射线光电子能谱 涂层 化学工程 丙烯酸酯 复合材料 聚合 核化学 电化学 聚合物 冶金 化学 单体 电极 物理化学 工程类
作者
Xifang Chen,Xiaoyu Wu,Kai Zhang,Tao Long
出处
期刊:Industrial & Engineering Chemistry Research [American Chemical Society]
卷期号:63 (3): 1228-1238 被引量:4
标识
DOI:10.1021/acs.iecr.3c03957
摘要

In response to the poor anticorrosion properties of waterborne coatings, g-C3N4 coated with zinc phosphate and polyaniline (PANI) was synthesized by in situ polymerization. Added to water-based epoxy-acrylate (WEP) emulsions, this new composite is used as an anticorrosive agent to protect metal substrates. The PANI film on the surface of g-C3N4 (denoted as CA) guarantees excellent g-C3N4 dispersion owing to the hydrophilic groups. The addition of zinc phosphate was to improve the corrosion protection ability of the composite (denoted as CAZP). The structure and chemical composition of the CAZP composite were analyzed by X-ray diffraction, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. Transmission electron microscopy was used to monitor the morphological changes of the composites and scanning electron microscopy to characterize the topography of different coatings. By applying these analyses, the successful formation of CAZP was confirmed. The anticorrosion performance of g-C3N4, CA, and CAZP coatings on Q235 carbon steel in 3.5 wt % NaCl solution was evaluated by electrochemical impedance spectroscopy and dynamic potential polarization curves. The results show that even after prolonged immersion (60 days) in the NaCl solution, the |Z0.01Hz| of CAZP/WEP was still as high as 1.69 × 109 Ω·cm2. The corrosion rate was reduced to 9.590 × 10–6 mpy, 3 orders of magnitude lower than that of the blank coating. This indicates that CAZP/WEP has excellent corrosion protection properties.
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