Figure 5: Severe corrosion was observed on the column surface of Sample 1. The thickness was measured to be at 12.78 mm.

Figure 5: Severe corrosion was observed on the column surface of Sample 1. The thickness was measured to be at 12.78 mm.

Figure 5: Severe corrosion was observed on the column surface of Sample 1. The thickness was measured to be at 12.78 mm.