聚多巴胺修饰六方氮化硼及其环氧复合涂层的腐蚀行为

发布时间：2018-10-21 09:15

【摘要】：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(~10~(10)Ω·cm~2)、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。
[Abstract]:In order to improve the dispersion of hexagonal boron nitride in solvents and organic coatings and to investigate its effect on the corrosion resistance of epoxy coatings, polydopamine (PDA) modified hexagonal boron nitride was used to improve the dispersion of hexagonal boron nitride in solvents and epoxy coatings. The morphology, chemical composition and thermal stability of modified hexagonal boron nitride were characterized by SEM,TEM,XPS,Raman,TG. In addition, the corrosion behavior of modified hexagonal boron nitride doped epoxy composite coating in 3.5%NaCl solution was studied by electrochemical method. The results show that, compared with epoxy coating, h-BN@PDA/ epoxy composite coating exhibits correct corrosion potential (-0.1 V),) and coating impedance value (~ 10 ~ (10) 惟 cm~2), low characteristic frequency value (~ 0.1 Hz);) and no obvious corrosion on the surface of metal substrate. Show excellent corrosion resistance. This is mainly due to the fact that the addition of nano-layered hexagonal boron nitride can reduce the porosity of the coating and delay the infiltration of corrosion medium, thus improving its corrosion resistance.
【作者单位】：中国科学院宁波材料技术与工程研究所海洋新材料与应用技术重点实验室;中国科学院大学;
【基金】：国家重点基础研究发展计划(973计划)(2014CB643302)~~
【分类号】：TG174.46

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