Anticorrosion properties of modified basalt powder/epoxy resin coating
The epoxy resin coating has been widely used; however, its anticorrosion performance still needs to be improved. Basalt materials have been used as fillers in the field of anticorrosive coatings due to their good corrosion resistance and acid and alkali resistance. In this paper, 3-aminopropyltrimethoxysilane (APTMS) was used as a coupling agent to modify the surface of basalt powder. The modified basalt powder (MBP) was characterized by scanning electron microscope (SEM) and Fourier transform infrared-attenuated total reflectance (FTIR-ATR). The MBP was added to epoxy resin in different proportions as fillers, and the coatings with different MBP contents were prepared by applying the mixture on the metal substrates. The hardness of coatings can be enhanced up to 0.25 GPa with the increase in MBP, and the elastic of coatings increases to the highest of 4.97 GPa for MBP-10/EP. Their water absorption rates after soaking in water for 21 h decreased to 0.75%. Meanwhile, the anticorrosion performance of the coatings on substrates during exposure to 3.5 wt% NaCl solution was investigated by using electrochemical impedance spectroscopy (EIS), and the circuit-fitting of EIS tests was also performed. The corrosion resistance of EP coating has been obviously improved by adding MBP, with the low-frequency impedance value (| Z | 0.01Hz ) of MBP-10/EP up to 2.43 × 10 8 Ω·cm 2 after being immersed in 3.5 wt% NaCl solution for 15 d, which was 7.8 times higher than that of neat epoxy coating (MBP-0/EP).
危险品化学品经营许可证（带存储）