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OM micrographs of the corrosion pits edges—S specimen after 24 h exposure in 1 M Cl− solution (represented by 5 wt % FeCl3 solution), cross section: (a) 20 ± 3 °C, magnification 100×; (b) 20 ± 3 °C, magnification 400×; (c) 50 °C, magnification 100×; (d) 50 °C, magnification 400×.
