Abstract
The corrosion mechanism of Mg-4Zn-0.4Zr-1.0Sr alloy in the as-cast and heat-treated (T4, T6) states was investigated by scanning electron microscopy (SEM), X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), immersion weight loss and electrochemical corrosion test. The results show that the long strips of the Mg17Sr2 phase precipitated along the grain boundaries in the as-cast state. The Mg17Sr2 phase is partially solid-solved into the matrix after heat treatment, and some Zr-containing particles precipitated in the T6 state are uniformly distributed on the surface of the alloy. It is shown that the T6 alloy has excellent corrosion resistance (0.39 ± 0.04 mm/y) due to the homogeneous microstructure and the uniform precipitated phase. In addition, corrosion products on the surface of the T6 alloy were detected to contain Sr-containing compounds as well as P-containing compounds, which are also important for improving the corrosion resistance of the alloy.
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