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SEM images of (a) as-cast and (b) TC-treated samples after a 2-h immersion in 0.01 M NaCl solution. SEM images of (c) as-cast and (d) TC-treated samples after a 2-h immersion in 0.01 M NaOH solution. The red arrows in Figure 3c show the corrosion pits induced by the NaOH solution.
