The corrosion characteristic of Mg-3Nd alloy without and with Al addition

The microstructure and corrosion behaviors of Mg-3Nd alloy without and with Al addition were characterized in the present work. The experimental results show that the microstructure of Mg-3Nd alloy is significantly refined by Al addition. There are two kinds of precipitated phases in the alloy with Al addition, which are Al 11 Nd 3 phase and Al 2 Nd phase. With increasing the Al addition, the E corr increases and the I corr decreases in Mg-3Nd alloy. The average immersion corrosion rate of Mg-3Nd alloy without Al addition is lower than that of Mg-3Nd alloy with 1% and 2% Al, but higher than that of Mg-3Nd alloy with 3% Al. When the Al content was 3%, the corrosion potential is −1.482 V, corrosion current density is 6.93 μ A/cm 2 and the corrosion rate is 0.69 mg cm −2 ·day −1 . The Mg-3Nd alloy without Al addition have a high frequency and a low frequency capacitive loop. The Mg-3Nd alloy with 1% and 2% Al has only a high frequency capacitive loop. When the Al addition is 3%, there are one high frequency capacitive loop and one low frequency inductive loop. The corrosion mechanism is different for Mg-3Nd alloy with increasing the Al addition.