Myrrh extract was tested as inhibitor on the corrosion of Cu in 2M HNO3 solution. These Tests were done by several procedures like weight loss procedure (WL), Potentiodynamic polarization (PL), electrochemical frequency modulation (EFM) and AC impedance spectra (EIS). The Cu surface was examined by utilizing atomic force microscope (AFM), scanning electron microscopy (SEM), Fourier transform infra-red (FT-IR) techniques. PL curves give indication that the myrrh acts as mixed type inhibitor. The WL, EIS and EFM results displayed that the inhibition efficiency (%IE) rise with myrrh concentration achieving 91.8% at 300 ppm, while it lowered by raising the temperature. Therefore, the results indicate that Myrrh extract has potential to be a corrosion inhibitor for Cu in acidic environment. The Langmuir adsorption isotherm agreed with the obtained results from WL method. Finally, it was found that the obtained results from several techniques are in approximately agreement.
Long‐persistent phosphorescent smart paints have the ability to continue glowing in the dark for a prolonged time period to function as energy‐saving products. Herein, new epoxy/silica nanocomposite paints were prepared with different concentrations of lanthanide‐doped aluminate nanoparticles (LAN; SrAl2O4:Eu2+,Dy3+). The LAN pigment was firstly coated with silicon dioxide (SiO2) utilizing the heterogeneous precipitation technique to provide LAN‐encapsulated between SiO2 nanoparticles (LAN@SiO2). The epoxy/silica/lanthanide‐doped aluminate nanoparticles (ESLAN) nanocomposite paints were coated on steel. The prepared ESLAN paints were studied by transmission electron microscopy (TEM), Fourier‐transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), X‐ray fluorescence (XRF) analysis, and energy‐dispersive X‐ray spectroscopy (EDS). The transparency and coloration properties of the nanocomposite coated films were explored by CIE Lab parameters and photoluminescence spectra. The ultraviolet‐induced luminescence properties of the transparent coated films demonstrated greenish phosphorescence at 518 nm upon excitation at 368 nm. Both hardness and hydrophobic activities were investigated. The anticorrosion activity of the nanocomposite films coated onto mild steel substrates immersed in aqueous sodium chloride (NaCl(aq)) (3.5%) was studied by electrochemical impedance spectroscopy (EIS). The silica‐containing coatings were monitored to exhibit anticorrosion properties. Additionally, the nanocomposite films with LAN@SiO2 (25%) exhibited the optimized long‐lasting luminescence properties in the dark for 90 min. The nanocomposite films showed highly reversible and durable long‐lived phosphorescence.
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