Preparation of GO/Polyester Resin Coatings and Its Corrosion Resistance
CAO Mingyan1, YU Aibin2, WU Yuping1, QIAO Lei1, CHENG Jie1
1 College of Mechanics and Materials, Hohai University, Nanjing 211100, China 2 Anhui Jinda Energy Saving Material Development Co. Ltd., Huaibei 235000, China
Abstract: Graphene was widely used in the field of anticorrosive coatings because of its excellent properties such as good barrier property, high mechanical strength and large specific surface area. Graphene oxide with good dispersion was added into polyester resin powder and the po-lyester coating with different contents of GO was prepared on 6063 aluminum alloy substrate pretreated with silane coupling agent by electrostatic spraying technology. The composition of silane film was analyzed by EDS spectrum and corrosion resistance of silane membrane was evaluated by electrochemical experiments; nano-indentation test was used to characterize the adhesion between coating and substrate; the effect of GO on the corrosion resistance of polyester coating was studied by immersion test and neutral salt spray test. The results showed that the corrosion potential of silane film was -0.831 V, which was higher than that of Zr-Ti film (-0.967 V), and the corrosion current density of silane film was 5.361×10-8 A/cm2, which was lower than that of Zr-Ti film (8.350×10-8 A/cm2). Compared with the TiZr film, the silane film had higher self-corrosion potential, lower self-corrosion current density and better corrosion resistance. The critical load value LC1 and LC2of the coating on the substrate surface pretreated with silane coupling agent were 2 035.71 mN and 3 066.66 mN, respectively, which were higher than those pretreated by Zr-Ti film (1 667.40 mN), and the adhesion between the coating and the substrate was stronger. Compared with the polyester coating without GO, the polyester coating with a mass fraction of 0.5% GO had the lowest weight loss and weight loss rate, and the surface of polyester coating showed fewer pores and corrosion pits after the 1 000 h salt spray experiment, so its corrosion resistance was evidently enhanced. Thus, the corrosion resistance of the coating was significantly improved when GO was added to the polyester resin coating with a mass fraction of 0.5%.
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2021, Vol. 35 
