The impact of a high molecule organic compound containing amine fragment (HMoA) on the corrosion ... more The impact of a high molecule organic compound containing amine fragment (HMoA) on the corrosion and electrochemical behaviors of carbon steel (CSA516), ferritic (SS410) and austenitic (SS304L) stainless steels was studied in the environment of the LAO (linear α-olefin) plant. Corrosion tests were carried out at 270 oC and 29 bar in an autoclave at different exposure time intervals (up to 30 days). Corrosion rates were determined using mass losses of the samples with and without HMoA. Optical microscopy (OM) and scanning electron microscopy (SEM) were employed to assess the morphologies of the corroded and inhibited surfaces. Efficiency and kinetics of electrode processes in the presence of HMoA were investigated by means of polarization and impedance measurements. Results of these experimental data are widely presented and discussed in this paper. It was found that the inhibition performance of the tested compound recorded inhibition efficiencies of 30%, 66% and 95% for CSA516, SS4...
ABSTRACT A series of Zn1–xNixFe2O4 nano ferrite (with x=0, 0.2, 0.4, 0.6, 0.8, and 1) composition... more ABSTRACT A series of Zn1–xNixFe2O4 nano ferrite (with x=0, 0.2, 0.4, 0.6, 0.8, and 1) compositions were synthesized using the combustion technique. The powder samples were characterized by XRD. The X-ray analysis showed that the samples were single phase spinel cubic structure. The AC resistivity decreases by increasing the frequency from 1 kHz to 10 kHz. As the frequency of the applied field increases the hopping of charge carrier also increase, thereby decreasing the resistivity. A shift in dielectric maximum is observed toward higher temperature with increasing the Ni content from 536 K to 560 K at 1 kHz. The HRTEM (high resolution TEM) images of four compositions have lattice spacing which confirms the crystalline nature of the samples. The surface morphology SEM of the sample consists of some grains with relatively homogenies distribution with an average size varying from 0.85 to 0.92 μm. The values for entropy change in this work are still small but are significally higher than the values that have been reported for iron oxide nanoparticle. The magnetic entropy change was calculated from measurements of M (H, T) where H is the magnetic field and T is the temperature. The maximum value of entropy change (∆S) obtained near Curie temperature which makes these material candidates for magnetocaloric applications.
The impact of a high molecule organic compound containing amine fragment (HMoA) on the corrosion ... more The impact of a high molecule organic compound containing amine fragment (HMoA) on the corrosion and electrochemical behaviors of carbon steel (CSA516), ferritic (SS410) and austenitic (SS304L) stainless steels was studied in the environment of the LAO (linear α-olefin) plant. Corrosion tests were carried out at 270 oC and 29 bar in an autoclave at different exposure time intervals (up to 30 days). Corrosion rates were determined using mass losses of the samples with and without HMoA. Optical microscopy (OM) and scanning electron microscopy (SEM) were employed to assess the morphologies of the corroded and inhibited surfaces. Efficiency and kinetics of electrode processes in the presence of HMoA were investigated by means of polarization and impedance measurements. Results of these experimental data are widely presented and discussed in this paper. It was found that the inhibition performance of the tested compound recorded inhibition efficiencies of 30%, 66% and 95% for CSA516, SS4...
ABSTRACT A series of Zn1–xNixFe2O4 nano ferrite (with x=0, 0.2, 0.4, 0.6, 0.8, and 1) composition... more ABSTRACT A series of Zn1–xNixFe2O4 nano ferrite (with x=0, 0.2, 0.4, 0.6, 0.8, and 1) compositions were synthesized using the combustion technique. The powder samples were characterized by XRD. The X-ray analysis showed that the samples were single phase spinel cubic structure. The AC resistivity decreases by increasing the frequency from 1 kHz to 10 kHz. As the frequency of the applied field increases the hopping of charge carrier also increase, thereby decreasing the resistivity. A shift in dielectric maximum is observed toward higher temperature with increasing the Ni content from 536 K to 560 K at 1 kHz. The HRTEM (high resolution TEM) images of four compositions have lattice spacing which confirms the crystalline nature of the samples. The surface morphology SEM of the sample consists of some grains with relatively homogenies distribution with an average size varying from 0.85 to 0.92 μm. The values for entropy change in this work are still small but are significally higher than the values that have been reported for iron oxide nanoparticle. The magnetic entropy change was calculated from measurements of M (H, T) where H is the magnetic field and T is the temperature. The maximum value of entropy change (∆S) obtained near Curie temperature which makes these material candidates for magnetocaloric applications.
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Papers by Nasser Mostafa