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Studies on coatings containing nano‐zinc oxide for steel protection
Materials and Corrosion ( IF 1.6 ) Pub Date : 2020-12-10 , DOI: 10.1002/maco.202012010
Abeer Shmait 1 , Ramadan Awad 2 , Hanan T. Rahal 1 , Michele Azouri 3 , Ashraf M. Abdel‐Gaber 4
Affiliation  

Zinc oxide (ZnO) nanoparticles (NPs) were synthesized using the coprecipitation method. The resulting NPs were characterized by X‐ray diffraction, transmission electron microscopy, and Fourier transform infrared spectroscopy. The surface morphology of the coatings has been characterized by scanning electron microscopy (SEM). SEM images show a uniform and homogeneous distribution of ZnO‐NPs in polyurethane (PU) coatings while aggregates appear in epoxy coatings. Using tensile stress–strain test, the effect of the addition of ZnO‐NPs on the mechanical properties of PU and epoxy coatings was examined. The addition of ZnO‐NPs has enhanced the Young's modulus and the tensile strength of PU and epoxy coatings. Through the open‐circuit potential and electrochemical impedance spectroscopy measurements, the anticorrosive properties of PU‐ or epoxy‐coated mild steel panels containing ZnO‐NPs have been investigated in 0.5 M NaCl solution. Nyquist impedance plots for PU and epoxy coatings in PU‐ or epoxy‐coated mild steel panels containing ZnO‐NPs were tested in the absence and presence of ZnO‐NPs have different responses. It has been shown that the dispersion of ZnO‐NPs significantly improves the anticorrosive performance of PU coatings. A PU coating containing 700 mg/kg ZnO‐NPs is recommended to achieve better mechanical properties and corrosion resistance.

中文翻译:

含纳米氧化锌的钢保护涂层的研究

使用共沉淀法合成了氧化锌(ZnO)纳米颗粒(NPs)。通过X射线衍射,透射电子显微镜和傅立叶变换红外光谱对生成的NP进行表征。涂层的表面形态已经通过扫描电子显微镜(SEM)表征。SEM图像显示ZnO-NPs在聚氨酯(PU)涂层中均匀而均匀地分布,而聚集体出现在环氧涂层中。使用拉伸应力-应变测试,研究了添加ZnO-NPs对PU和环氧涂层的机械性能的影响。ZnO-NPs的添加提高了PU和环氧涂料的杨氏模量和拉伸强度。通过开路电势和电化学阻抗谱测量,在0.5 M NaCl溶液中研究了含ZnO-NP的PU或环氧涂层低碳钢板的防腐性能。在不存在和存在ZnO-NP的情况下,测试了含有ZnO-NP的PU或环氧涂层的软钢板中PU和环氧涂层的奈奎斯特阻抗图。结果表明,ZnO-NPs的分散显着提高了PU涂层的防腐性能。建议使用含有700 mg / kg ZnO-NPs的PU涂层,以获得更好的机械性能和耐腐蚀性。结果表明,ZnO-NPs的分散显着提高了PU涂层的防腐性能。建议使用含有700 mg / kg ZnO-NPs的PU涂层,以获得更好的机械性能和耐腐蚀性。结果表明,ZnO-NPs的分散显着提高了PU涂层的防腐性能。建议使用含有700 mg / kg ZnO-NPs的PU涂层,以获得更好的机械性能和耐腐蚀性。
更新日期:2020-12-10
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