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Surface Engineering Volume 35, 2019 - Issue 5
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Research Articles

Effects of SiO2 particle size on the corrosion resistance of fluoropolymer/SiO2 composite coatings

J. P. LuSchool of Materials Science and Engineering, Changzhou University, Changzhou, People’s Republic of China;Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou, People’s Republic of China;Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University, ChangzhouJiangsu, People’s Republic of ChinaView further author information
,
L. ChenSchool of Materials Science and Engineering, Changzhou University, Changzhou, People’s Republic of China;Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou, People’s Republic of China;Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University, ChangzhouJiangsu, People’s Republic of ChinaView further author information
&
R. G. SongSchool of Materials Science and Engineering, Changzhou University, Changzhou, People’s Republic of China;Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou, People’s Republic of China;Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University, ChangzhouJiangsu, People’s Republic of ChinaCorrespondence[email protected]
[email protected]
View further author information
Pages 440-449 | Received 21 May 2018, Accepted 10 Jun 2018, Published online: 02 Jul 2018
 
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ABSTRACT

The surfaces of SiO2 ultra-fine particles with different sizes have been modified by γ-(2, 3-epoxypropoxy)propytrimethoxysilane (KH-560) silane coupling agent. Then the homogeneous fluoropolymer/SiO2 composite coatings have been successfully prepared on mild steel substrates. The surface grafting of KH-560 on SiO2 particles was detected by means of Fourier transform infrared spectroscopy, thermo gravimetric analysis and transmission electron microscopy. The surface morphologies and corrosion resistance of fluoropolymer/SiO2 composite coatings were characterised by field emission scanning electron microscopy, potentiodynamic polarisation as well as electrochemical impedance. The results showed that KH-560-modified SiO2 particles can decrease agglomeration effectively, and the particles play a beneficial role in improving the corrosion resistance of the coated steel significantly. There exists an obvious effect of SiO2 particles size on the corrosion resistance of fluoropolymer/SiO2 composite coatings. Also, the SiO2 particles with diameter of 150 nm are of the best effect among all particle sizes.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The financial aid of the National Natural Science Foundation of China under Grant No. 51371039 is gratefully acknowledged.

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