Accelerated degradation rate of AZ31 magnesium alloy by copper additions

作者：Zhou, Miao; Liu, Chuming^*; Xu, Shiyuan; Gao, Yonghao; Jiang, Shunong

来源：Materials and Corrosion-werkstoffe Und Korrosion, 2018, 69(6): 760-769.

DOI：10.1002/maco.201709827

• AlCuMg secondary phase
• anodic magnesium matrixes
• AZ31-xCu alloys
• degradation rate
• micro-galvanic cathode

Corrosion property of AZ31-xCu (x=0, 0.5, 1.5, 3wt%) alloys has been investigated using scanning electron microscope (SEM) equipped with energy dispersive spectroscope (EDS), X-ray diffractometer (XRD), immersion tests, and electrochemical measurements. The results indicate that the content of AlCuMg phase, main secondary phase in the Cu-containing alloys, is positively dependent on copper concentration. Acceleration of corrosion rate is found in Cu-containing alloys due to micro-galvanic corrosion. AlCuMg phase acts as micro-galvanic cathode against anodic magnesium matrixes. In this regard, the degradation rate is decreasing in the following order: AZ31-3Cu>AZ31-1.5Cu>AZ31-0.5Cu>AZ31.

• 出版日期2018-6
• 单位中南大学