Figure 8: Severe corrosion was observed on the column surface of Sample 4. The thickness was measured to be at 12.35 mm.

Figure 8: Severe corrosion was observed on the column surface of Sample 4. The thickness was measured to be at 12.35 mm.

Figure 8: Severe corrosion was observed on the column surface of Sample 4. The thickness was measured to be at 12.35 mm.