Microstructure and Corrosion Behavior of ZK60-1Nd Magnesium Alloy

作者：Chu Xu; Wang Zhongjun^*; Zhang Tao; Wang Dongxiao; Wang Hongbin

来源：Rare Metal Materials and Engineering, 2018, 47(5): 1429-1436.

• ZK60-1Nd
• magnesium alloy
• homogenization
• microstructure
• corrosion resistance

Microstructure and corrosion behavior of ZK60-1Nd magnesium alloy in 3.5 wt% NaCl aqueous solution were studied by scanning electron microscope (SEM), X-ray diffractometer (XRD), electrochemical workstation and a brine weight loss method. The results indicate that the as-cast microstructure of the ZK60-1Nd alloy is mainly composed of matrix alpha-Mg, and a coarse network eutectic MgZn2 phase containing rare earth Nd distributed along the grain boundaries. The corrosion rate of the alloy in 3.5 wt% NaCl aqueous solution is 0.2 mg.cm(-2).h(-1). After annealing at 400 degrees C for 96 h, part of the eutectic phase is fused to particles with a maximum size of 0.5 gm and the corrosion rate is reduced to 0.1 mg.cm(-2)-h(-1). After annealing at 500 degrees C for 8.0 h, fishbone eutectic phase is fused to patchy, the MgZn2 phase is dissolved into the matrix, the contents of Nd, Zn and Zr are increased with uniform distribution in the matrix, and the corrosion rate reaches a minimum of 0.03 mg.cm(-2).h(-1). The improvement of corrosion resistance is attributed to the increase of the solid solution Nd content in matrix alpha-Mg, which increases the corrosion potential and decreases micro galvanic corrosion in number.

• 出版日期2018-5
• 单位辽宁科技大学