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Accelerated degradation rate of AZ31 magnesium alloy by copper additions
Author(s) -
Zhou Miao,
Liu Chuming,
Xu Shiyuan,
Gao Yonghao,
Jiang Shug
Publication year - 2018
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201709827
Subject(s) - diffractometer , materials science , scanning electron microscope , copper , metallurgy , cathode , corrosion , electrochemistry , alloy , magnesium alloy , magnesium , galvanic corrosion , galvanic cell , galvanic anode , anode , phase (matter) , electrode , composite material , chemistry , cathodic protection , organic chemistry
Corrosion property of AZ31‐ x Cu ( x = 0, 0.5, 1.5, 3 wt%) 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.