Abstract
In this study, polyaniline (PANI) and different mass ratios of PANI/glass flake (PANI–GF, PGF) composites were prepared via in situ oxidative polymerization. The chemical structure of the composites was investigated via Fourier transform infrared spectroscopy and X-ray diffraction. PANI, GF, and PGF composites were added as fillers into epoxy coating and then applied on a steel substrate. The corrosion resistance of the coatings was evaluated through electrochemical impedance spectroscopy and salt spray test. The coatings added with PANI, GF, and PGF composites displayed improved corrosion resistance. The greatest improvement in corrosion resistance was exhibited by the coating loaded with PGF composites at a PANI/GF mass ratio of 2:1. This enhancement was attributed to the passivation ability of PANI and the penetration resistance of the GF in the coating. Moreover, PANI was coated uniformly on the GF surface, and the composites were uniformly dispersed in the epoxy resin.
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