Effects of nanoparticles on the corrosion resistance of fluoropolymer coatings on mild steel

Abstract

The surfaces of nanoparticles of SiO 2 , TiO 2 and Al 2 O 3 have been modified by γ-(2,3-epoxypropoxy) propyltrimethoxysilane (KH-560) in order to achieve proper dispersion of nanoparticles and possible chemical interactions between nanoparticles and polymeric coatings, and then the homogeneous fluoropolymer coatings containing nanoparticles of SiO 2 , TiO 2 and Al 2 O 3 have been successfully prepared on mild steel substrates. The surface morphologies of the coatings were characterised by field emission scanning electron microscopy. The effects of incorporating various nanoparticles on the corrosion resistance of fluoropolymer-coated steel were investigated by potentiodynamic polarisation curve, electrochemical impedance spectroscopy and salt spray tests. The results showed that KH560-modified nanoparticles can decrease agglomeration effectively, and the nanoparticles play a beneficial role in improving the corrosion resistance of the coated steel significantly. In addition, SiO 2 nanoparticles are of the best effect among three kinds of nanoparticles.

Suppressing Crystallinity by Nanoconfining Polymers Using Initiated Chemical Vapor Deposition

“…This will ultimately impact the performance of the intended final application that makes use of polymers within confined nanodomains. For example, for applications of polymer electrolytes in batteries and solar cells, which typically have the polymers integrated with nanostructured and porous device electrodes, a decrease in polymer crystallinity often improves ion conduction and device behavior. , Specifically, the nanocomposite system of hydrophilic TiO 2 and a hydrophobic polymer, like PPFDA, can potentially be useful as a self-cleaning surface for water purification due to the photocatalytic activity of TiO 2 in degrading pollutants, , and as enhanced anticorrosion coatings for protecting metals, as various TiO 2 –fluoropolymer systems have shown. One of the main challenges with creating such hydrophilic–hydrophobic nanocomposites, particularly with TiO 2 , is its photoinduced hydrophilicity that makes it hard for conventional liquid-based methods to integrate TiO 2 with a hydrophobic fluoropolymer, − and iCVD, as a liquid-free approach, is able to overcome such limitations.…”

One-step fabrication of thermal sprayed polymer coating on metals

“…There are a few well established traditional coating processes are being used for deposit polymer coating, such as solvent-based system; powder coating process; fluidized bed coating process and flame spray coating process. Many polymer-based coatings are deposited by spray/brushing/dipping following by curing method for anti-corrosion, anti-graffiti, transparent hydrophobic, lubricating applications [7][8][9][10][11][12][13]. A recent study reports Polytetrafluoroethylene coating deposited by magnetron sputtering may act as oil adsorbing layer [14].…”

Influence of pH on the growth behaviour of Mg–Al LDH films

“…Recently, the applications of LDH as films to protect magnesium alloys have been investigated due to their ion-exchange capacity and self-healing ability [16,17]. Currently, two main methods have been developed to produce LDH films: (i) the in situ method, and (ii) the co-precipitation method [9,10]. Song et al [9] produced Mg-Al LDH films on a magnesium alloy using the co-precipitation method, which possessed good self-healing ability.…”

“…Currently, two main methods have been developed to produce LDH films: (i) the in situ method, and (ii) the co-precipitation method [9,10]. Song et al [9] produced Mg-Al LDH films on a magnesium alloy using the co-precipitation method, which possessed good self-healing ability. The films could provide good corrosion protection for the substrate.…”