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Abstract
In this paper, the superhydrophobic poly(vinylidene fluoride)/fluorinated ethylene propylene/SiO2/CNTs-EDTA (PFSC-EDTA) composite coating was successfully fabricated and applied for anti-scaling performance. The deposition of CaCO3 on the surface of the superhydrophobic PFSC-EDTA composite coating reached 0.0444 mg/cm2 for 192-h immersion into the supersaturated CaCO3 solution, which was only 11.4% that of the superhydrophobic PFSC composite coating. At the interface between the CaCO3 solution and the PFSC-EDTA coating, the Ca2+ could be firstly chelated by EDTA that was benefit for improving the anti-scaling performance of the superhydrophobic PFSC-EDTA composite coating. In another hand, the addition of EDTA to the CNTs played an important role in fabricating the SiO2-centric and CNTs-EDTA-surrounded multilevel micro–nanostructure in the superhydrophobic PFSC-EDTA composite coating, in favor of maintaining the air film under the water and the stability of the superhydrophobic surface. The research supplies a new way of improving anti-scaling performance of superhydrophobic coating by incorporating the organic chelating agent at the interface and changing the traditional way of scale prevention.
Highlights
Scaling is very common in the petroleum industry, heat exchangers, high-power heat sinks and electronics and the corresponded industries especially in the process of oil exploitation
The morphology of the as-prepared superhydrophobic PFSC and PFSC-ethylenediaminetetraacetic acid (EDTA) composite coatings was analyzed by the scanning electron microscope (SEM)
The incorporation of EDTA to the CNTs played an important role in fabricating a SiO2-centric and CNTs-EDTA-surrounded multilevel micro–nanostructure in the superhydrophobic PFSC-EDTA composite coating
Summary
Scaling is very common in the petroleum industry, heat exchangers, high-power heat sinks and electronics and the corresponded industries especially in the process of oil exploitation. An effective and promising strategy to reduce the formation of inorganic scales has been the fabrication of anti-scaling surface by coating; among them, the pre-stored of scale inhibitors to the functional coating is one innovative idea (Zhu et al 2021). Inspired by the anti-scaling of the polymer superhydrophobic composite coating and the chemical scale inhibitor, it is worthwhile to investigate the combination of these two ways for scale prevention. It is necessary to further study the deposition of CaCO3 on the polymer-based superhydrophobic composite coating, coupling with the effect of organic chelating agent. Owing to the coupled effect between the organic chelating agents (EDTA) and polymer-based superhydrophobic composite coating, the PFSC-EDTA composite coating exhibits unique anti-scaling performance. This research on the organic chelating agent-enhanced antiscaling performance of the superhydrophobic coating will play an important role in industrial application. We believe that this work will pave a new way for the anti-scaling of functional coating in petroleum industry
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