Cailiao Baohu (Jul 2022)

Effect of Graphene on the Performance of Polyaniline/Epoxy Coating on Magnesium Alloy Surface

  • XIAO Shuai, ZHANG Ying-jun, DOU Bao-jie, CUI Xue-jun, YANG Fei

DOI
https://doi.org/10.16577/j.issn.1001-1560.2022.0186
Journal volume & issue
Vol. 55, no. 7
pp. 74 – 81

Abstract

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For studying the effects of different addition ways of graphene on the properties of polyaniline/epoxy coatings, the in - situ polymerization method was applied to synthesize polyaniline (PANI)/graphene(G) composite powders on graphene surface, and the as - prepared powders were characterized by X - ray diffractometer, Fourier transform infrared spectrometer and scanning electron microscope. The as - synthesized composite powders, the mixed powders of PANI and G, and the PANI powders were uniformly dispersed in epoxy resin respectively to prepare coatings on the surface of AZ91D magnesium alloy. Subsequently, the effects of different graphene addition methods on the properties of polyaniline/epoxy coatings were studied through electrochemical impedance measurement, water absorption, etc. Results showed that after an immersion within 2 160 h in 3.5% (mass fraction) NaCl solution, the coating added with PANI/G composite powders not only had a higher impedance value in comparision with those added with PANI powders or with PANI/G powders, but also had better flexibility and impact resistance. Compared with the mixed powders of PANI and G, the PANI/G composite powders obtained through in - situ polymerization could better exhibit the shielding effect of G and the corrosion inhibition effect of PANI, and therefore provid better protection to magnesium alloy.

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