Mechanistic study of ammonium-induced corrosion of AZ31 magnesium alloy in sulfate solution

Hui Pan^b, Liwei Wang^a, Yi Lin^b, Feng Ge^b, Kang Zhao^a, Xin Wang^b, Zhongyu Cui^b^,^*(

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Fig. 3.. SEM morphologies of the surface corrosion products on AZ31 magnesium alloy after immersion in the solutions containing 0.001 M (a₁)-(a₃), 0.01 M (b₁)-(b₃), and 0.1 M (c₁)-(c₃) NH₄⁺ for 6 h (a₁)-(c₁), 24 h (a₂)-(c₂), and 120 h (a₃)-(c₃). (The delineated points are detected by EDS.).