Poly (vinyl butyral)/Graphene oxide/poly (methylhydrosiloxane) nanocomposite coating for improved aluminum alloy anticorrosion

By G. Zhu, Xiaokun Cui, Yue Zhang, Shougang Chen, Mengyao Dong, Hu Liu, Qian Shao, T. Ding, Shide Wu, Zhanhu Guo. Polymer, 2019

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Abstract A polyvinyl butyral (PVB)/graphene oxide (GO) nanocomposite coating was prepared via spin coating method to improve the anticorrosion ability of aluminum alloy. Poly (methylhydrosiloxane) (PMHS) has been innovatively applied as anti-corrosion coatings of aluminum substrate owing to its hydrophobicity. The properties of the coating were characterized by Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM) and other methods. Meanwhile, the corrosion resistance of the coating in 3.5 wt% NaCl solution was estimated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The SEM observations showed that the coating was uniformly distributed on the surface of aluminum. EIS tests showed that the coating had a remarkable anticorrosive effect on the metal surface. Compared with bare aluminum, the low frequency impedance modulus improved three orders of magnitude, reaching 107 Ω cm2. The polarization curve showed that the corrosion current density (Icorr) decreased more than three orders of magnitude, reaching 7.8 × 10−9 A cm−2. The long-term immersion experiment indicated that the coating could effectively protect the aluminum for up to 1200 h. This study provides a facile way of using polymer nanocomposites to tackle the corrosion of aluminum alloy for industrial applications.

Subfields: Civil and Structural Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/96b5a1e45d467935d469b98139b7225ce452ff5a