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摘要
Nano-SiO2was firstly modified by (3-glycidoxypropyl)-trimethoxylsilane (GPTMS), and then was grafted with polyaniline (PANI) to form nano-SiO2(SiO2@PANI) sol with core-shell structure through chemical bonding. Further, the nano-SiO2(SiO2@PANI) sol was in situ embedded with vinyl trimethoxysilane (VTMS) to prepare the water-born SiO2@PANI/VTMS sol, which can be used as coating material for Mg-Li alloy. The structure and morphology of SiO2@PANI were characterized by Fourier transform infrared spectrum (FT-IR), X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) etc. The corrosion resistance of the coating was assessed by potentiodynamic polarization curves and electrochemical impedance spectra (EIS). The effect of anilineand VTMS-dosage on the particle size, hydrophobic property and corrosion resistance of SiO2@PANI were also examined, and the possible anticorrosion mechanism was proposed. The results show that the SiO2@PANI/VTMS coatings have a high hydrophobic angle, which could reach 145.5°when m(An): m(TEOS)=7: 100 and m(VTMS): m(TEOS)=4: 4. The composite coatings on Mg-Li alloy present excellent corrosion resistance performance with electrochemical impedance value 7.5×104Ω·cm2and corrosion current density 4.47×10-8A/cm2.
- 出版日期2018
- 单位哈尔滨工程大学
