Author/Authors :
Skal, Siham Laboratory of Materials, Nanotechnology and Environment - Faculty of Sciences - Mohammed V University, Morocco , Kerroum, Younes Laboratory of Materials, Nanotechnology and Environment - Faculty of Sciences - Mohammed V University, Morocco , Guenbour, Abdellah Laboratory of Materials, Nanotechnology and Environment - Faculty of Sciences - Mohammed V University, Morocco , Bellaouchou, Abdelkbir Laboratory of Materials, Nanotechnology and Environment - Faculty of Sciences - Mohammed V University, Morocco , Tabyaoui, Mohamed Laboratory of Materials, Nanotechnology and Environment - Faculty of Sciences - Mohammed V University, Morocco , Idrissi, Hassane Laboratoire MATEIS Equipe RI2S - bât L. de Vinci, Villeurbanne cedex, France , Warad, Ismail Department of Chemistry and Earth Sciences - Qatar University, Doha, Qatar , Zarrouk, Abdelkader Laboratory of Materials, Nanotechnology and Environment - Faculty of Sciences - Mohammed V University, Morocco
Abstract :
The abrasion-corrosion behavior of the alloy 31 was tested at different temperatures
25 °C, 40 °C, 60 °C and 80 °C in polluted phosphoric acid medium. Electrochemical
measurements were investigated using techniques such as electrochemical impedance
spectroscopy and potentiodynamic polarization. In order to determine the oxides and
hydroxides formed at the interface of the alloy, we opted for surface treatment techniques:
SEM-EDX, UV-Vis-NIR spectroscopy, and X-ray diffraction. The results showed an increase
in current densities, which means that these conditions favor the hydrogen evolution reaction
and influence the parameters of the passive film. Moreover, this effect can be explained by an
increase in the activity of the aggressive ions adsorbed on the surface, thereby accelerating the
dissolution process and the exchange kinetics between the electrode surface and the electrolyte.
UV-Vis-IR spectroscopy and X-ray diffraction analysis exhibited that temperature favors the
formation of metal oxides on the surface, which the EIS discloses that film was less protective.
Keywords :
SEM-EDX , UV-Vis-NIR spectroscopy , X-ray diffraction , Phosphoric acid , Abrasion-corrosion
