Abstract
The complex marine environment in the splash zone and the deep-sea area is always raising stern challenges for the steel structures served in the offshore facilitates. Compared with other coating fillers, the carbon fiber (CF), with outstanding mechanical strength, is a suitable candidate filler for coating reinforcement. However, CF has a poor compatibility with organic resin, which could cause defects inside the coating, and result in coating failure further. Hence, we used dopamine to modify CF surface (CF-PDA) and introduced CF-PDA into the epoxy coating as reinforced additive to improve the erosion wear resistance and anti-corrosion ability of coating. The interfacial shear strength (IFSS) of CF-PDA/epoxy was increased by 32.20%, compared with CF/epoxy. After 120 h immersion under 30 MPa pressure, the |Z|0.01 Hz of the CF-PDA/EP (1.04 × 108 Ω cm2) was obviously higher than EP, and the interfaces of steel/coating and CF-PDA/resin were not failure evidently. Meantime, after the erosion wear test, compared with EP, the mass loss and the volume loss of CF-PDA/EP were decreased by 19.40% and 25.72%, respectively. Then, the failure process of coatings was discussed during erosion wear test, and we explained the relationship between the erosion wear resistance of coatings and interfacial strength of CF-PDA/epoxy resin.
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