Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
Polish version English version Language
enabled [disable] Abstract
Number of results

Results found: 2

Number of results on page
first rewind previous Page / 1 next fast forward last

Search results

help Sort By:

help Limit search:
first rewind previous Page / 1 next fast forward last
1
Content available remote

Improvement of Surface Properties of Low Carbon Steel by Nitriding Treatment

100%
Benlahreche F., Nouicer E.
Acta Physica Polonica A
|
2017
|
vol. 131
|
issue 1
20-23
EN
This work aimed to improve the physicochemical properties of a low carbon steel C15 by a nitriding treatment in a salt bath at 580°C. The micrographs of treated sample show that the nitriding treatment causes significant structural changes, it is allowed to delineate the nitriding layer. The X-ray diffraction and the Raman spectroscopy of the treated samples permitted to identify different nitrides (Fe_{2-3}N, Fe₄N) formed. The obtained hardness profile determines the nitriding depth. Potentiodynamic curves show that the corrosion current density of treated C15 is the 10 times lower than untreated specimen. The values of impedance parameters obtained after nitriding treatment indicate that the resistance values and exponent n increase, whereas the capacitance decreases. We concluded that the nitriding treatment is an effective method for improvement of the corrosion behavior and surface properties of the low alloy steel C15.
2
Content available remote

Spectroscopic Characterization of Titanium Alloy Surface in a Biological Medium

81%
Nouicer E., Benlahreche F., Nouicer A.
Acta Physica Polonica A
|
2017
|
vol. 131
|
issue 1
28-31
EN
This work is aimed to study the effect of a biological medium simulated body fluid on surface modification of titanium alloy Ti6Al4V. Electrochemical techniques and the Raman spectroscopy are used. Polarization curves, plotted at different scan rates (5, 1, 0.5, and 0.2 mV/s), show a large range of passivation (above 3000 mV), with no occurrence of transpassivation. The return sweep shows the negative hysteresis with the shift of the corrosion potential in the more noble direction. The corrosion current is generally very low. These observations clearly confirm the high stability of the TiO₂ passive film. The Raman spectroscopy shows that titanium dioxide formed consists of rutile phase. It was found that the scan rate has not a significant effect on the passivation phenomenon. However, it influences the corrosion potential and the current density. Electrochemical impedance spectroscopy allowed to establish the Nyquist diagrams and Bode around the equilibrium potential, and at different imposed potentials in the passivation field. The system behavior is not purely capacitive and so it is necessary to take in consideration the constant phase element. The impedance diagrams at different imposed potentials on the passivation field are composed only of a single loop.
first rewind previous Page / 1 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.