Effects of SiO2 particle size on the corrosion resistance of fluoropolymer/SiO2 composite coatings. (4th May 2019)

• Record Type: Journal Article
• Authors: Lu, J. P.; Chen, L.; Song, R. G.
• Is Part Of: Surface engineering. Volume 35:Number 5(2019)
• Page Start: 440
• Page End: 449
• Publication Date: 2019-05-04
• Subjects: Composite coatings -- SiO2 -- fluoropolymer -- particle size -- corrosion resistance; Surfaces (Technology) -- Periodicals; Coatings -- Periodicals; 620.4405
• DOI: 10.1080/02670844.2018.1491511
• Languages: English
• ISSNs: 0267-0844

Abstract

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.