Investigation of anticorrosion properties of epoxy GO nanocomposites spin coated Aluminum Alloy 7075

Polymers and Polymer Composites Pub Date : 2022-01-01 DOI:10.1177/09673911221106047

M. Gaur, R. Raghav, R. Sagar, R. Tiwari

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Abstract

The bisphenol A diglycidyl ether-polyaminoamide (epoxy resin)–graphene oxide (GO) nanocomposites have been prepared by chemical methods. The aim of this study is to produce epoxy –GO coatings on Aluminum Alloy 7075 and study the anticorrosion properties. Thin films have been characterized by scanning electron microscope – Energy Dispersive X-rays Spectroscopy (EDX) and Raman spectra. Raman spectra show the successful bonding of GO functional groups with epoxy. The composition of epoxy and GO is characterized by EDX. The Tafel plots were undertaken for analysis of corrosion of coating material. Therefore, the reduction of corrosion current of epoxy–GO nanocomposites coated Al alloy 7075 show its superior corrosion resistance properties. This is further confirmed by electrochemical impedance spectroscopy and potentiodynamic polarization. The very high value of low frequency impedance modulus (i.e. 1010 Ω cm2) shows surprising anticorrosive effect on coating. The epoxy–GO spin coating in Al Alloy 7075 is significantly reduces the corrosion current density (Icorr) and corrosion rate due to anticorrosion properties of GO.

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环氧氧化石墨烯纳米复合材料自旋涂覆7075铝合金的防腐性能研究

采用化学方法制备了双酚A -二缩水甘油酯醚-聚氨基酰胺(环氧树脂)-氧化石墨烯(GO)纳米复合材料。本研究的目的是在7075铝合金表面制备环氧氧化石墨烯涂层，并研究其防腐性能。用扫描电子显微镜-能量色散x射线能谱(EDX)和拉曼光谱对薄膜进行了表征。拉曼光谱显示氧化石墨烯官能团与环氧树脂成功成键。环氧树脂和氧化石墨烯的组成用EDX表征。采用Tafel图对涂层材料进行腐蚀分析。因此，环氧氧化石墨烯纳米复合材料涂层铝合金7075的腐蚀电流减小，显示出其优异的耐腐蚀性能。电化学阻抗谱和动电位极化进一步证实了这一点。非常高的低频阻抗模量(即1010 Ω cm2)对涂层显示出惊人的防腐效果。在7075铝合金中采用环氧氧化石墨烯自旋涂层，由于氧化石墨烯的防腐性能，显著降低了腐蚀电流密度(Icorr)和腐蚀速率。

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Polymers and Polymer Composites

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