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Chinese Journal of Materials Research  2017, Vol. 31 Issue (11): 818-826    DOI: 10.11901/1005.3093.2016.497
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Investigation on Anti-corrosion Mechanism of 8-hydro-xyquinoline Modified Nano-silica/epoxy Coatings
Wei SUN1, Fuchun LIU1(), Ganxin JIE2, Wei KE1, En-Hou HAN1, Ju WANG2, Haijun HUANG2, Yu DU1
1 Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
2 State Key Laboratory of Environmental Adaptability for Industrial Products, China National Electric Apparatus Research Institute Co., Ltd, Guangzhou 510633, China.
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Wei SUN, Fuchun LIU, Ganxin JIE, Wei KE, En-Hou HAN, Ju WANG, Haijun HUANG, Yu DU. Investigation on Anti-corrosion Mechanism of 8-hydro-xyquinoline Modified Nano-silica/epoxy Coatings. Chinese Journal of Materials Research, 2017, 31(11): 818-826.

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Abstract  

Composites of 8-hydroxyquinoline/nano-SiO2 were prepared with nano-SiO2 as carrier and 8-hydroxyquinoline as modifier. Then the composistes were blended with epoxy resin to form the nanocomposite epoxy coating. The corrosion performance of the prepared composite coating was investigated by means of salt spray test and electrochemical impedance spectroscopy. Results show that composites of 8-hydroxyquinoline/nano-SiO2 can improve the corrosion resistance of the epoxy coatings, among others the coating with 5% (mass fraction) 8-hydroxyquinoline/nano-SiO2 was the optimal. The relevant mechanism may be ascribed to the fact that 8-hydroxyquinoline could release from pores of nano-SiO2 and then penetrate to the interface coating/steel substrate forming Fe-containing complex, thus improving the corrosion resistance of the steel substrate.
Key words:  materials failure and protection      wind power equipment      nano-container      sustained release mechanism      steel substrate     
Received:  07 November 2016     
Fund: Supported by Key Technology of Corrosion Control on Wind Power Equipment Academician Workstation Project (No. 2013B090400023), Guangzhou Industry-university-research Collaborative Innovation Alliance Special Project (No. 201604046014)
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Wei SUN
Fuchun LIU
Ganxin JIE
Wei KE
En-Hou HAN
Ju WANG
Haijun HUANG
Yu DU

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.497     OR     https://www.cjmr.org/EN/Y2017/V31/I11/818

Fig.1  TEM image of nano-SiO2 and HQ-SiO2 particles (a) nano-SiO2; (b) HQ-SiO2
Fig.2  Different time of release curve the 8 - hydroxyquinoline from nano-SiO2
Sample 1 2 3 4 5 Mean
B0 6.8 6.7 6.8 6.5 6.1 6.58
B1 7.2 7.2 7.3 7.6 6.9 7.24
B3 7.5 7.8 7.5 7.9 8.2 7.78
B5 7.6 7.8 8.3 8.5 8.7 8.18
Table 1  Pull-off test results of adhesion of the B0、B1、B3 and B5 coatings (MPa)
Fig.3  Photos of the coated panels after salt spray tests for 1000 h (a) B0, (b) B1, (c) B3 and (d) B5
Sample Small bubble area% Mid-bubble area/% Big bubble area/% Average width of corrosion expansion/mm
(a) 85 5 0 7.6
(b) 15 1 0 7.3
(c) 10 1 0 5.6
(d) 0 1 0 6.4
Table 2  Corrosion situation of coated panels after salt spray tests for 2000 h
Fig.4  SEM images of the scribe sections of (a) B0, (b) B1, (c) B3 and (d) B5 coated samples after 1000 h salt spray tests
Fig.5  Bode plots of coated panels with different loading of HQ-SiO2 after different immersing times in 3.5%NaCl solution (a) B0, (b) B1, (c) B3 and (d) B5
Fig.6  EEC models for the coated panels at different immersion stages,(a) equivalent circuit for the intact coating has one time constant and(b)equivalent circuit for the coating have two-time constant
Fig.7  Change of coating resistance with immersion time
Fig.8  Current mapping of the 5% HQ-SiO2 epoxy coated steel with an artificial defect immersed in 3.5%NaCl solution Current density distribution
Fig.9  IR diagrams, (a) HQ,(b) HQ- SiO2, (c) corrosion products
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