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Chinese Journal of Materials Research  2018, Vol. 32 Issue (1): 42-50    DOI: 10.11901/1005.3093.2017.155
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Anticorrosion Properties of Waterborn SiO2@PANI/VTMS Coating on Surface of Mg-Li Alloy
Xiaohui GAO1,2, Xiaoyan JING1(), Yufeng LI3, Jingjing ZHU2, Shi QI2
1 College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
2 College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar 161006, China
3 College of Materials Science and Engineering, Qiqihar University, Qiqihar 161006, China
Cite this article: 

Xiaohui GAO, Xiaoyan JING, Yufeng LI, Jingjing ZHU, Shi QI. Anticorrosion Properties of Waterborn SiO2@PANI/VTMS Coating on Surface of Mg-Li Alloy. Chinese Journal of Materials Research, 2018, 32(1): 42-50.

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Abstract  

Nano-SiO2 was 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 aniline- and 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 7.5×104 Ωcm2 and corrosion current density 4.47×10-8 A/cm2.
Key words:  materials failure and protection      polyaniline      nano-silica      chemical bonding      Mg-Li alloy      anticorrosion     
Received:  28 February 2017     
ZTFLH:  TB304  
Fund: Supported by National Natural Science Foundation of China (No. 51401113), Postdoctoral Science-research Developmental Foundation of Heilongjiang Province of China (No. LBH-Q13171)
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Articles by authors
Xiaohui GAO
Xiaoyan JING
Yufeng LI
Jingjing ZHU
Shi QI

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.155     OR     https://www.cjmr.org/EN/Y2018/V32/I1/42

Fig.1  FTIR spectra of SiO2, PANI and SiO2@PANI
Fig.2  XRD patterns of SiO2, PANI and SiO2@PANI
Fig.3  XPS spectrum of SiO2@PANI
Fig.4  TEM photographs of SiO2 (a) and SiO2@PANI as m(An):m(TEOS) is 3:100 (b), m(An):m(TEOS) is 7:100 (c) and m(An):m(TEOS) is 20:100 (d)
Fig.5  The particle size distributions of SiO2@PANI with different m(An):m(TEOS)
Fig.6  Potentiodynamic polarization curves for Mg-Li alloy coated by SiO2@PANI/VTMS composite coatings with different aniline dosages
m(An)：m(TEOS) Electrical conductivity/Scm-1 Contact angle/° Corrosion rate/mma-1 Rp/Ωcm2 Icorr/Acm-2 Ecorr/V PEF/%
Mg-Li — — 1.24×100 5.50×10 4.74×10-4 -1.61 ——
3:100 3.2×10-4 139.4 1.02×10-1 6.67×103 3.91×10-6 -1.57 99.17
5:100 6.9×10-3 140.9 1.60×10-2 4.26×104 6.12×10-7 -1.48 99.87
7:100 7.4×10-2 140.2 3.19×10-3 2.58×105 1.01×10-7 -1.22 99.98
10:100 3.8×10-2 135.7 1.97×10-2 3.47×104 7.51×10-7 -1.29 99.84
20:100 4.2×10-2 129.8 3.57×10-2 1.91×104 1.36×10-6 -1.38 99.71
Table 1  Conductivity of SiO2@PANI, contact angle, fitting results of potentiodynamic polarization curves of composite coatings with different aniline dosages
Fig.7  EIS for Mg-Li alloy coated by SiO2@PANI/VTMS composite coatings with different aniline dosages (a) Nyquist plot; (b) Bode plot
m(VTMS)：m(TEOS) Contact angle/° Adhesion / grade Corrosion rate/mma-1 Rp/Ωcm2 Icorr/Acm-2 Ecorr/V PEF/%
Dry Wet
1:4 124.8 2 4 1.09×10-1 6.27×103 4.16×10-6 -1.43 99.12
2:4 131.2 1 2 1.89×10-2 3.61×104 7.22×10-7 -1.30 99.85
3:4 140.2 0 1 3.19×10-3 2.58×105 1.01×10-7 -1.22 99.98
4:4 145.5 0 0 1.17×10-3 5.84×105 4.47×10-8 -1.17 99.99
6:4 139.7 0 0 2.25×10-3 3.04×105 8.57×10-8 -1.20 98.98
Table 2  Contact angle, adhesion, fitting results of potentiodynamic polarization curves of composite coatings with different VTMS dosages
Fig.8  Potentiodynamic polarization curves for Mg-Li alloy coated by SiO2@PANI/VTMS composite coatings with different VTMS dosages
Fig.9  EIS for Mg-Li alloy coated by SiO2@PANI/VTMS composite coatings with different VTMS dosages (a) Nyquist plot; (b) Bode plot
Fig.10  High resolution XPS spectra of Mg 1s (a) and O 1s (b) of the surface of Mg-Li alloy beneath the coating
Fig.11  Anticrrosion mechanism of SiO2@PANI/VTMS coating on Mg-Li alloy in initial (a), medium (b) and later stage (c) of immersion
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