为了提高六方氮化硼在溶剂和有机涂层中的分散并探究其对环氧涂层耐蚀性能的影响,采用聚多巴胺(PDA)修饰六方氮化硼改善其在溶剂和环氧涂层中分散性的方法,通过SEM、TEM、XPS、Raman、TG表征了改性六方氮化硼的形貌、化学组成和热稳定性;除此之外,采用电化学方法研究了改性六方氮化硼掺入环氧复合涂层在3.5％NaCl溶液中的腐蚀行为.结果表明:与环氧涂层相比,h-BN@PDA/环氧复合涂层在长效腐蚀测试过程中表现出更正的腐蚀电位(-0.1 V)、高的阻抗模值和涂层阻抗值(～1010 Ω·cm2)、低的特征频率值(～0.1 Hz);且金属基底表面无明显腐蚀,显示优异的抗腐蚀性能.这主要是因为纳米层状六方氮化硼的添加可以降低涂层的孔隙率并且能够延缓腐蚀介质的渗入,进而提高了其耐腐蚀性能.
In order to improve the dispersion of hexagonal boron nitride (h-BN) in the solvents and organic matrix,and to investigate the effect of h-BN on the corrosion resistance of epoxy coating,polydopamine was modified on the h-BN to achieve the well dispersion stability of h-BN in the solvents and epoxy coating.The corresponding morphology,chemical composition and thermal stability were characterized by SEM,TEM,XPS,Raman spectrum and TG.In addition,the corrosion behavior of the epoxy coating and h-BN@PDA/epoxy coating was investigated in 3.5％NaCl solution by electrochemical measurements.The results indicate that h-BN@PDA/epoxy composite coating exhibites nobler open circuit potential (-0.1 V),higher impedance modulus and coating resistance (～1010 Ω·cm2),lower breakpoint frequency (～0.1 Hz) than those of the epoxy coating during long time immersion in 3.5 ％ NaCl solution.Furthmore,very little corrosion is found at the substrate surface coated with h-BN@PDA/epoxy composite coating,indicating the outstanding corrosion resistance of the composite coating.Addition of h-BN nanosheets can reduce the coating's porosity and inhibit the penetration of corrosive medium,which helps to improve the corrosion resistance of the composite coating.
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