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Three-dimensional profiles in 20× magnification immersed in sulphuric acid. (a) LM6, 5 days; (b) LM6, 10 days; (c) LM6 + 0.01 wt.% Sr, 5 days; (d) LM6 + 0.01 wt.% Sr, 10 days; (e) LM6 + 0.05 wt.% Sr, 5 days; and (f) LM6 + 0.05 wt.% Sr, 10 days.
