Thermally Conductive Anticorrosive Epoxy Nanocomposites with Tannic Acid-Modified Boron Nitride Nanosheets
Duo Pan, Xiaodong Zhang, Gui Yang, Ying Shang, Fengmei Su, Qian Hu, Rahul Patil, Hu Liu, Chuntai Liu, Zhanhu Guo
Abstract
Boron nitride nanosheets (BNNSs) were synthesized by the classical chemical vapor deposition (CVD) method and modified by tannic acid (TA) (named as M-BNNSs). M-BNNSs have greatly improved the thermal conductivity (0.45 W/(m·K)) and mechanical tensile strength (15.10 MPa) of epoxy resin (EP). More importantly, the EP composite coating with an appropriate amount of M-BNNS not only has an excellent anticorrosion effect (the Icorr of 10%M-BNNS@EP is 8.053 × 10–7 A/cm2 after immersed in 3.5 wt % NaCl solution for 30 min) on the metal substrates but also has a good anticorrosion stability. The impedance modulus (|Z|0.01) of the 10%M-BNNS@EP coating is higher than that of the neat EP coating and other composite coating systems during 120 h of immersion. Polarization curve (Tafel) and electrochemical impedance spectroscopy (EIS) tests reveal that the 10%M-BNNS@EP coating not only has an excellent anticorrosion effect on the metal substrates but also has a good anticorrosion stability after being immersed in 3.5 wt % NaCl aqueous solution for 120 h.