Figure 5
Four close-up images of corroded copper tube tails, each showing different patterns and extents of corrosion. The images are arranged in a two-by-two grid. The top left image shows a copper tube tail with scattered, small black spots and patches of corrosion. The top right image displays a copper tube tail with larger, irregular black patches of corrosion. The bottom left image features a copper tube tail with extensive black corrosion covering a significant portion of the surface. The bottom right image shows a copper tube tail with a mix of small and large black corrosion spots.Corrosion at the tail of copper tube. Source (s): Authors’ own work