Xue, J.; Wang, J.; Cao, Y.; Zhang, X.; Zhang, L.; Chen, K.; Huang, C. Corrosion Protection Mechanism Study of Nitrite-Modified CaAl-LDH in Epoxy Coatings. Coatings2023, 13, 1166.
Xue, J.; Wang, J.; Cao, Y.; Zhang, X.; Zhang, L.; Chen, K.; Huang, C. Corrosion Protection Mechanism Study of Nitrite-Modified CaAl-LDH in Epoxy Coatings. Coatings 2023, 13, 1166.
Xue, J.; Wang, J.; Cao, Y.; Zhang, X.; Zhang, L.; Chen, K.; Huang, C. Corrosion Protection Mechanism Study of Nitrite-Modified CaAl-LDH in Epoxy Coatings. Coatings2023, 13, 1166.
Xue, J.; Wang, J.; Cao, Y.; Zhang, X.; Zhang, L.; Chen, K.; Huang, C. Corrosion Protection Mechanism Study of Nitrite-Modified CaAl-LDH in Epoxy Coatings. Coatings 2023, 13, 1166.
Abstract
In this work, nitrite intercalated CaAl-LDH was firstly prepared in this work. Scanning electronic microscopy (SEM) coupled with the energy dispersive spectrometer (EDS) was used to characterize the morphology and element composition of the synthesized powder. Fourier transform infrared spectroscopy (FTIR) was used to characterize the chemical composition and X-ray diffraction (XRD) was used to analyze the structure. The nitrite release curve and the chloride concentration change curve were obtained to study the anion-exchange reaction. The corrosion protection effect of the CaAl-LDH loaded with nitrites towards the carbon steel was evaluated in 0.02 M NaCl solution by electrochemical impedance spectroscopy (EIS). Then the powder was added in the epoxy coating with a percentage of 2% (vs. epoxy resin). The coating morphology and roughness was evaluated by SEM and laser microscopy, and the corrosion protection effect was investigated by EIS in an immersion period of 21 d. Local electrochemical impedance spectra (LEIS) was used to characterize the corrosion development process in micro-corrosion sites. The corrosion product of the scratched area after salt spray exposure was analyzed by EDS and Raman spectroscopy. The corrosion protection mechanism of the CaAl-LDH loaded with nitrites was proposed based on the above experimental results.
Chemistry and Materials Science, Materials Science and Technology
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