Abstract
The hexagonal boron nitride (h-BN) nanosheets modified by silane coupling agent (KH560) were doped into acrylic acid coating on the surface of galvanized steel to improve its corrosion resistance. H-BN nanosheets modified by KH560 were prepared and characterised by scanning electron microscopy, transmission electron microscopy, atomic force microscopy, X-ray diffraction, and Fourier-transform infrared spectroscopy. The corrosion resistance of the acrylic acid coatings was measured by electrochemical testing. The results show that the corrosion current density of the coating with modified h-BN nanosheets was reduced from 2.2 × 10−5 A/cm2 to 2.3 × 10−7 A/cm2 compared with the acrylic acid coating. The impedance of the composite coating with modified h-BN is 4435 Ω·cm2, higher than the BNNS coating (2500 Ω·cm2) and the acrylic acid coating (1500 Ω·cm2). This is due to the physical barrier and electrical insulation properties of the hexagonal boron nitride (h-BN) nanosheets.
Highlights
Hot-dip galvanizing technology is often used to protect the steel substrate [1]
The crystal structures of boron nitride nanosheets (BNNS) and KH560 modified BNNS were characterised by X-ray diffraction (XRD) with Cu Kα radiation source at a scanning rate of 6◦ /min
KH-560-modified BNNS was successfully synthesized by dopamine binding to boron nitride through a π–π bond, and the chemical interaction between the catechol group in dopamine and
Summary
Hot-dip galvanizing technology is often used to protect the steel substrate [1]. white rust accumulates on the surface of the galvanized layer in the atmosphere. Most research on this topic focuses on the addition of boron nitride to the coatings, but studies related to the addition of BNNS to waterborne acrylic coatings for the protection of hot-dip galvanized steel sheets are relatively scarce. The modified BNNS retain good chemical stability, have hydroxyl groups attached to the surface, and can be uniformly dispersed in the waterborne acrylic coating. The KH560 modified BNNSs were added into the preparation of the waterborne acrylic coating on the hot-dip galvanized steel sheet. BNNSs coatings was tested by an electrochemical workstation This coating provided a physical shield to protect the metal substrate, and the corrosion resistance of the coating was effectively improved by the addition of the modified BNNSs
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