A Comprehensive Study on the Effect of ZnO and ZnAl2O4 Nanoparticles on the Mechanical Properties of Epoxy Coating: Tensile and Hardness

Modern Applied Science Pub Date : 2021-09-22 DOI:10.5539/mas.v15n5p45

Abeer Shmait, Nour El Ghouch, J. A. Boukhari, A. Abdel-Gaber, R. Awad

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Abstract

ZnO and ZnAl2O4 nanoparticles (NPs) were successfully prepared by the co-precipitation method and characterized by x-ray powder diffraction, transmission electron microscopy, and Fourier transform infrared spectroscopy. The prepared NPs were incorporated into epoxy (EP) coating with mass ratios 200  800 mg/kg of ZnO NPs/EP and ZnAl2O4 NPs /EP. The prepared coatings were characterized by scanning electron microscopy and Fourier transform infrared spectroscopy, and their mechanical properties were investigated, at room temperature, after 5, 10, 15, and 20 days of preparation. Tensile tests showed an improvement in the tensile properties, with the best improvement in ultimate tensile strength (93.2%) for 800 mg/kg ZnAl2O4 NPs/EP coating after 15 days of preparation. The ZnO NPs/EP and ZnAl2O4 NPs/EP coatings exhibited noticeable sensitivity to the stretching rate. Vickers microhardness (Hv) investigations showed normal indentation size effect behavior for all the samples. The best improvement in Hv was attained after 5 days of preparation, for all coatings, with the best improvement (9.15%) for 700 mg/kg ZnO NPs/EP.

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ZnO和ZnAl2O4纳米颗粒对环氧涂层力学性能影响的综合研究:拉伸和硬度

采用共沉淀法成功制备了ZnO和ZnAl2O4纳米粒子(NPs)，并用x射线粉末衍射、透射电镜和傅里叶变换红外光谱对其进行了表征。将制备的NPs加入到质量比为200 ~ 800 mg/kg的ZnO NPs/EP和ZnAl2O4 NPs/EP的环氧树脂涂层中。采用扫描电子显微镜和傅里叶变换红外光谱对制备的涂层进行了表征，并在室温下、制备5、10、15和20天后对其力学性能进行了研究。拉伸性能得到改善，制备800mg /kg ZnAl2O4 NPs/EP涂层后15天的抗拉强度提高幅度最大，达到93.2%。ZnO NPs/EP和ZnAl2O4 NPs/EP涂层对拉伸速率有明显的敏感性。维氏显微硬度(Hv)测试表明，所有样品的压痕尺寸效应都是正常的。在制备5 d后，所有涂层的Hv都得到了最好的改善，其中700 mg/kg ZnO NPs/EP涂层的改善效果最好(9.15%)。

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Modern Applied Science

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