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Journal of Chinese Society for Corrosion and protection  2015, Vol. 35 Issue (5): 447-454    DOI: 10.11902/1005.4537.2014.226
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Influence of Corrosion Inhibitor Carriered Nano-SiO2 on Corrosion Resistance of Epoxy Coating
Wei SUN1,Guilai YIN2,Fuchun LIU1(),Nan TANG2,En-Hou HAN1,Junbiao WAN2,Wei KE1,Jingwei DENG2
1. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. State Grid Jiangxi Electric Power Research Institute, Nanchang 330096, China
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Abstract  

The 8-hydroxyquinoline (8Q), as a sustained-release corrosion inhibitor was deposited onto nano-particles of mesoporous-silica to prepare 8-hydroxyquinoline-silica (8Q-SiO2) powder. Then the powder was used as pigment to modify epoxy resin to prepare 8Q-SiO2-epoxy resin coating. The prepared 8Q-SiO2 was characterized by means of infrared spectrum and ultraviolet absorption spectrum. The corrosion performance of the 8Q-SiO2-epoxy resin coating was examined by salt spray test and electrochemical impedance measurement. The results revealed that the 8Q can enhance the corrosion resistance of epoxy coating, and among others the epoxy coating with 5% (mass fraction) 8Q-SiO2 exhibits the highest corrosion resistance, which may be ascribed to that the 8Q may slowly release from the mesoscopic channels within SiO2 into the epoxy coating and then arrive at the interface coating/substrate to provide corrosion inhibition for the substrate.
Key words:  8-hydroxy quinoline      nano-silica      epoxy coating      electric transmission and transformation equipment      anticorrosive material     
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Wei SUN
Guilai YIN
Fuchun LIU
Nan TANG
En-Hou HAN
Junbiao WAN
Wei KE
Jingwei DENG

Cite this article: 

Wei SUN, Guilai YIN, Fuchun LIU, Nan TANG, En-Hou HAN, Junbiao WAN, Wei KE, Jingwei DENG. Influence of Corrosion Inhibitor Carriered Nano-SiO2 on Corrosion Resistance of Epoxy Coating. Journal of Chinese Society for Corrosion and protection, 2015, 35(5): 447-454.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.226     OR     https://www.jcscp.org/EN/Y2015/V35/I5/447

Fig.1  IR diagrams of SiO2 (a), 8Q (b) and 8Q-SiO2 (c)
Fig.2  TG curves of SiO2 and 8Q-SiO2
Fig.3  N2 adsorption-desorption isotherms of SiO2 (a) and 8Q-SiO2 (b)
Sample Average pore diameter / nm Surface area m2g-1 Pore volume cm3g-1
SiO2 13.724 146.209 0.502
8Q-SiO2 12.707 142.436 0.452
Table 1  Physical properties of SiO2 and 8Q-SiO2
Fig.4  Ultraviolet absorption curves of 8Q (a) and 8Q-SiO2 (b)
Sample 1 2 3 4 5 Mean
Z0 2.3 2.3 2.2 2.3 2.4 2.3
Z1 3.4 3.3 3.4 3.5 3.4 3.4
Z3 3.8 3.7 3.8 3.6 3.7 3.7
Z5 3.9 4.2 4.2 4.3 4.4 4.2
Table 2  Pull-off test results of adhesion of Z0, Z1, Z3 and Z5 coatings
Fig.5  Surface morphologies of Z0 (a), Z1 (b), Z3 (c) and Z5 (d) coated samples after salt spray tests for 2000 h
Sample Small bubbles area / % Mid-bubbles area / % Big bubbles area / % Maximum width of corrosion expansion / mm
Z0 0 0 15 15
Z1 0 13 0 11
Z3 4 9 0 8.5
Z5 7 2 0 5
Table 3  Corrosion situation of coated samples after salt spray tests for 2000 h
Fig.6  SEM images of the scribe sections of Z0 (a), Z1 (b), Z3 (c) and Z5 (d) coated samples after 2000 h salt spray tests
Fig.7  EDX results of the scribe sections of Z0 (a) and Z5 (b) coated samples after salt spray tests
Fig.8  Impedance module (a, c, e, g) and phase angle (b, d, f, h) plots for Z0 (a, b), Z1 (c, d), Z3 (e, f) and Z5 (g, h) coated samples after immersed for different time
Fig.9  Equivalent circuits with one time constant (a) and two-time constant (b) for the intact coating
Fig.10  Changes of coating resistance with immersion time
Fig.11  Changes of water absorption of the coatings with immersion time
Fig.12  Releasing mechanism of silica loaded with 8Q
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