|
|||||
|
|
Effect of the heat treatment on the corrosion behaviour of amorphous Fe-Cr-P-C-Si alloy in 0.5 M H2SO4 |
|
| Authors: | M Belkhaouda A Benlhachemi B Hammouti |
| Institution: | a Laboratoire de Chimie Moléculaire et Corrosion, Faculté des Sciences, BP 8106 Agadir, Morocco b Laboratoire de Physico-Chimie des Matériaux, Faculté des Sciences., BP 8106 Agadir, Morocco c Laboratoire de l’Environnement et Sciences de l’Eau, E N S A, BP 33/S Agadir, Morocco d Laboratoire de Chimie des eaux et Corrosion, Faculté des Sciences, Oujda, Morocco e Laboratoire de Physico-Chimie des Matériaux; E N S de Takaddoum, BP 5118 Rabat, Morocco |
| Abstract: | The effect of the heat treatment on the corrosion behaviour of amorphous Fe85Cr5P6C3Si alloy in 0.5 M H2SO4 has been investigated using electrochemical techniques. Heat treatment was carried out at temperatures varying between 250 and 650 °C at different times 30, 60, 120 and 240 min. The evolution of crystallization processes after annealing was identified by differential thermal analysis (DTA) and by X-ray diffraction (XRD). The diagrams obtained by DTA show that the structure of samples treated at high temperature changes towards a crystalline state. This crystallization phenomenon is confirmed by the analysis with the XRD. The results obtained from the polarization curves reveal that for all the studied temperatures of annealing, Fe-Cr-P-C-Si exhibits a phenomenon of passivation without breakdown of passivity. The best corrosion resistance is obtained at the temperature of annealing 350 °C. For an annealing at higher temperatures, Fe85Cr5P6C3Si becomes less corrosion resistant than same amorphous alloy treated with temperatures lower than 350 °C. |
| Keywords: | Amorphous Corrosion Heat treatment Polarization X-ray diffraction |
| 本文献已被 ScienceDirect 等数据库收录！ | |