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Preparation and Anti-Corrosion Properties of Polyaniline-Boron Nitride Nanoparticle Composite Waterborne Epoxy Coating

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  • (1.School of Chemistry and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;2.Ningbo Institute of Materials Technologies and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;3.Hangzhou Benchuang Technology Co., Ltd., Hangzhou 310030, China)
LIU Shuan (1986-), Ph.D., Senior Engineer, Research Focus: Marine Heavy Anticorrosive Coatings, E-mail:liushuan@nimte.ac.cn

Received date: 2023-06-05

  Revised date: 2023-08-14

  Accepted date: 2023-09-10

  Online published: 2024-03-08

Supported by

Science and Technology Project of Hangzhou Benchuang Technology Co., Ltd.; National Key R&D Program “Development and Application Demonstration of Deepsea Underwater Electro-Hydraulic Actuator (EHA)”(Item number:2023YFC2809901)

Abstract

For improving the anti-corrosion performance and durability of waterborne epoxy coatings in high-salt, high-humidity marine environments, polyaniline/boron nitride nanoparticles (PBN) were prepared by the in-situ polymerization of polyaniline (PANI) on the surface of hydroxylated hexagonal boron nitride (BN).In addition, PBN were used as anti-corrosion filler to enhance the anti-corrosion performance of waterborne epoxy coatings.The structure and micro-morphology of nano-particles were characterized by Fourier transform infrared spectroscopy(FT-IR) and scanning electron microscopy (SEM).Moreover, electrochemical tests and neutral salt spray tests (NSS) were used to explore the effects of BN, PANI modifications and PBN addition amount on the anti-corrosion performance of waterborne epoxy coatings.Results showed that PANI grew in situ on the surface of BN nanosheets to form a coral-like structure, and the bonding strength of waterborne epoxy coating reached 6.05 MPa after adding 0.50%(mass fraction,the same below) PBN.The corrosion current density (1.99×10-9 A/cm2) of the composite coating immersed in 3.5%NaCl solution after 120 h was reduced by about 3 orders of magnitude compared to that of pure epoxy coating (1.01×10-6 A/cm2).This was attributed to the fact that the addition of 0.50%PBN could evenly disperse in the epoxy resin, fill small gaps in the coating and enhance the barrier effect against corrosive medium.Meanwhile, PANI had a corrosion inhibition effect, which could synergistically improve the anti-corrosion performance of pure epoxy coatings.

Cite this article

AN Ran, HAN Fei, LAN Ke, LI Zhu, GUO Xiaoping, LIU Shuan . Preparation and Anti-Corrosion Properties of Polyaniline-Boron Nitride Nanoparticle Composite Waterborne Epoxy Coating[J]. Materials Protection, 2024 , 57(2) : 18 -27 . DOI: 10.16577/j.issn.1001-1560.2024.0029

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