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首页> 外文期刊>International Journal of Electrochemical Science >Study on Corrosion Resistance of AZ31 Magnesium Alloy Coated with Graphene Modified Epoxy and Polyurethane Coatings
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Study on Corrosion Resistance of AZ31 Magnesium Alloy Coated with Graphene Modified Epoxy and Polyurethane Coatings

机译：石墨烯改性环氧和聚氨酯涂料涂层AZ31镁合金耐腐蚀性研究

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摘要

Graphene-modified epoxy resin coating can impart better corrosion resistance to magnesium alloys. In this regard, the present work focuses on the preparation of graphene-modified oil-based epoxy resin/polyurethane composite coating (G/OEP/OPU) and waterborne epoxy resin/polyurethane composite coating (G/WEP/WPU) and is coated over the AZ31 magnesium alloy to elucidate the corrosion protection behavior. Scanning electron microscopic observation shows that the surface quality of graphene flakes is good. When graphene is added to the oil-based and waterborne epoxy primers, the surface quality of the oil-based polyurethane topcoat is improved, while the surface quality of the waterborne polyurethane topcoat is reduced. Fourier transform infrared spectroscopic testing shows that the coating and the curing agents are the major structural components of the coating. The electrochemical test results show that the composite coatings can significantly improve the corrosion resistance of magnesium alloys. In the oily composite coatings, G/OEP/OPU-0.3wt% shows the highest corrosion resistance where the corrosion current density is 1.81×10-12A/cm2 . For waterborne composite coatings, G/WEP/WPU-0wt% has the least corrosion current density value of 5.07×10-12 A/cm2 . The comprehensive analysis suggests that the graphene improves the bonding performance of the primer and topcoat in the case of oily composite coating leading to the improvement in the surface quality of the topcoat and increase the coating's ability to resist the penetration of corrosive media. For waterborne composite coatings, the hydrophobic graphene improves the hydrophobicity of the primer coat, and therefore, the curing quality of the waterborne polyurethane topcoat is deprived that weakens the corrosion resistance of the waterborne composite coating.
机译：石墨烯改性的环氧树脂涂层可以赋予镁合金更好的耐腐蚀性。在这方面，本工作侧重于制备石墨烯改性的油基环氧树脂/聚氨酯复合涂层（G / OEP / OPU）和水性环氧树脂/聚氨酯复合涂层（G / WEP / WPU）并涂覆AZ31镁合金阐明腐蚀保护行为。扫描电子显微镜观察表明石墨烯片的表面质量良好。当将石墨烯加入油基和水性环氧引物时，改善了油基聚氨酯面漆的表面质量，而水性聚氨酯面涂层的表面质量降低。傅里叶变换红外光谱检测表明，涂层和固化剂是涂层的主要结构部件。电化学试验结果表明，复合涂层可显着提高镁合金的耐腐蚀性。在油性复合涂层中，G / OEP / OPU-0.3wt％表示腐蚀电流密度为1.81×10-12a / cm2的最高耐腐蚀性。对于水性复合涂层，G / WEP / WPU-0WT％具有最小腐蚀电流密度值5.07×10-12a / cm2。综合分析表明，石墨烯在油性复合涂层的情况下提高了底漆和面漆的粘合性能，从而提高了面漆的表面质量并增加涂层抵抗腐蚀性介质渗透的能力。对于水性复合涂料，疏水性石墨烯改善了底漆涂层的疏水性，因此，剥夺了水性聚氨酯面漆的固化质量削弱了水性复合涂层的耐腐蚀性。

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