TY - JOUR AU - Hanna, A AU - Rabahi, L AU - Soualili, MA AU - Dakhouche, A AU - Bradai, D AU - Azzeddine, H PY - 2020/03/26 Y2 - 2024/03/29 TI - On the corrosion behaviour of as-cast and heat-treated Mg-RE alloys in 0.9% NaCl solution JF - Journal of Metals, Materials and Minerals JA - J Met Mater Miner VL - 30 IS - 1 SE - Original Research Articles DO - 10.55713/jmmm.v30i1.600 UR - https://jmmm.material.chula.ac.th/index.php/jmmm/article/view/600 SP - AB - The microstructure and corrosion behaviour of as-cast and heat-treated Mg-1.44Nd and Mg-1.43Ce (wt.%) alloys in 0.9% NaCl (wt.%) solution were investigated using electrochemical tests, X-ray diffraction (XRD) and scanning electron microscopy, combined with energy-dispersive X-ray spectroscopy (SEM-EDS). The as-cast microstructure of both alloys revealed the presence of second phases. Heat treatment at 535°C for 6 h led to a more uniform distribution of the second phases in Mg-1.44Nd alloy and their dissolution along the grains boundaries in the Mg-1.43Ce alloy. As a result, the corrosion resistance was improved in the heat-treated alloys. Accordingly, the corrosion resistance values for the heat-treated alloys were much higher than those of the as-cast alloys, indicating that the heat-treated alloys were less susceptible to the corrosion. Also, the heat-treated Mg-1.43Ce alloy seems to have very good corrosion resistance (26890 Ω cm<sup>2</sup>) compared to the Mg-1.44Nd alloy (6156 Ω·cm<sup>2</sup>) by preventing pitting corrosion along the grains boundaries. The corrosion product was made up mainly of magnesium hydroxide Mg(OH)<sub>2</sub> and magnesium oxide MgO and more uniform corrosion morphology were found in the heat-treated alloys. ER -