An intelligent coating based on pH-sensitive hybrid hydrogel for corrosion protection of mild steel

Wen, Juan; Lei, Jinglei; Chen, Jinlong; Gou, Jian‐Jun; Liu, Ying; Li, Lingjie

doi:10.1016/j.cej.2019.123742

Cited by 61 publications

(30 citation statements)

References 54 publications

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“…This strategy also helps to prevent unnecessary leaching of inhibitors and achieve more economical and efficient use of the corrosion inhibitors. Notably, the use of carriers requires specific triggers that shall promote the release of inhibitors under certain conditions such as pH change, light or mechanical damage [ 15 ]. Various types of carriers, loaded with different actives species, have been studied in recent years, such as metal oxides, layered double hydroxides and layer by layer assemblies based on polyelectrolytes [ 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of Epoxy Coating Modified with Yttrium Oxide Loaded with Imidazole on the Corrosion Protection of Steel

et al. 2021

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The search for highly effective corrosion protection solutions to avoid degradation of the metallic parts is enabling the development of polymeric organic coatings. Of particular relevance, polymeric nanocomposite coatings, modified with corrosion inhibitors, have been developed to provide enhanced surface protection. In this work, yttrium oxide nanoparticles loaded with corrosion inhibitor (Imidazole), used as additives in the formulation of epoxy for coated on the steel substrate. The loading of Y2O3 with imidazole was confirmed by field emission scanning electron microscopy (FE-SEM) and Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and Brunauer–Emmett–Teller analysis. UV-Vis analysis demonstrated the pH-sensitive behavior of the imidazole that helps in self-release when necessary. Electrochemical impedance spectroscopy (EIS) of the coated samples revealed that the coating modified with Y2O3/IMD provides better corrosion protection compared to coatings containing only Y2O3. XPS analysis validated the presence of an imidazole protective film on the steel substrate that enhanced the corrosion resistance of the coated samples

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Section: Introductionmentioning

confidence: 99%

Effectiveness of Epoxy Coating Modified with Yttrium Oxide Loaded with Imidazole on the Corrosion Protection of Steel

et al. 2021

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“…Currently, so-called smart polymers that respond to the external environment are gathering considerable interest. These materials change their properties under the influence of temperature, pH, UV-Vis radiation, electric, and magnetic field effects [8][9][10][11][12]. Among the most popular polymers are chitosan [13] and Eudragit E 100 (EE100)-methacrylic acid copolymer [14].…”

Section: Introductionmentioning

confidence: 99%

Electrophoretic Deposition and Characterization of Chitosan/Eudragit E 100 Coatings on Titanium Substrate

et al. 2020

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Currently, a significant problem is the production of coatings for titanium implants, which will be characterized by mechanical properties comparable to those of a human bone, high corrosion resistance, and low degradation rate in the body fluids. This paper aims to describe the properties of novel chitosan/Eudragit E 100 (chit/EE100) coatings deposited on titanium grade 2 substrate by the electrophoretic technique (EPD). The deposition was carried out for different parameters like the content of EE100, time of deposition, and applied voltage. The microstructure, surface roughness, chemical and phase composition, wettability, mechanical and electrochemical properties, and degradation rate at different pH were examined in comparison to chitosan coating without the addition of Eudragit E 100. The applied deposition parameters significantly influenced the morphology of the coatings. The chit/EE100 coating with the highest homogeneity was obtained for Eudragit content of 0.25 g, at 10 V, and for 1 min. Young’s modulus of this sample (24.77 ± 5.50 GPa) was most comparable to that of human cortical bone. The introduction of Eudragit E 100 into chitosan coatings significantly reduced their degradation rate in artificial saliva at neutral pH while maintaining high sensitivity to pH changes. The chit/EE100 coatings showed a slightly lower corrosion resistance compared to the chitosan coating, however, significantly exceeding the substrate corrosion resistance. All prepared coatings were characterized by hydrophilicity.

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“…Due to the vibration of the probe and the change of the distance, an alternating current capacitor is generated between the two surfaces, and its current amplitude is proportional to the potential difference. After measuring and calibrating the potential of the probe, the measured potential of the working electrode can be determined . The potential of the metal changes with the change of the corrosion potential after the corrosion process occurs .…”

Section: Resultsmentioning

confidence: 99%

Self-Healing Coatings Containing Core–Shell Nanofibers with pH-Responsive Performance

Wang

et al. 2021

ACS Appl. Mater. Interfaces

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The micro−nanofibers prepared by the electrospinning technique can be used as a good container for loading healing agents. The core−shell electrospun nanofibers with polyacrylonitrile as the outer shell and tannic acid (TA) and tung oil as the core healing agents were synthesized by a coaxial electrospinning method and exhibited pH-sensitive ability. The nanofibers as additives were added to an epoxy resin coating as a self-healing coating. The morphological stability of the electrospun nanofibers were observed by a scanning electron microscope and a transmission electron microscope. Fourier transform infrared spectroscopy and fluorescence microscopy reveal that the successful synthesis and uniform distribution of core−shell fibers. The mechanical properties test revealed that the tensile properties of the coating could be improved by adding nanofibers. The infrared mapping test, energydispersive spectrometry, and X-ray photoelectron spectroscopy, which were carried out on the scratched part of the coating, proved the release of the healing agent in the damaged part. TA forms a protective film on the exposed metal surface through molecular adsorption under acidic conditions. Meanwhile, the curing of tung oil can effectively compensate into the microcracks to form a TA protective film, which could improve the self-healing performance. As the tung oil dries and solidifies in the alkaline solution, the cross-linking effect of the molecules is combined to form a tight film and strength the self-healing ability. TA as an acidic healing agent and tung oil as an alkaline healing agent played the role of pH-sensitive products in healing the cracked coating. The selfhealing rates of coating immersing in 3.5 wt % acidic NaCl solution and alkaline solution were 81.6 and 71.2%, respectively. The composite coating shows a great pH-sensitive self-healing ability to heal the cracked coating.

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An intelligent coating based on pH-sensitive hybrid hydrogel for corrosion protection of mild steel

Cited by 61 publications

References 54 publications

Effectiveness of Epoxy Coating Modified with Yttrium Oxide Loaded with Imidazole on the Corrosion Protection of Steel

Effectiveness of Epoxy Coating Modified with Yttrium Oxide Loaded with Imidazole on the Corrosion Protection of Steel

Electrophoretic Deposition and Characterization of Chitosan/Eudragit E 100 Coatings on Titanium Substrate

Self-Healing Coatings Containing Core–Shell Nanofibers with pH-Responsive Performance

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