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The corrosion surface morphologies of (a) Mg–2Sr alloy, (b) Mg–2Sr–Ca alloy, (c) Mg–2Sr–Zn alloy after immersion in Hank's solution for 20 days, (d) the EDS result of the marked point (point A) in Fig. 2b and (e) the point B in Fig. 2c, (f) the XRD patterns of these alloys after 20 days immersion tests.
