Figure 10
The image contains nine microscopic photos arranged in a 3x3 grid. Each row represents a different sample type: corrugated hose, pressure-bearing section, and copper tube. The columns are labeled 1, 4, and 5, indicating different samples or conditions. Panel 1 shows the corrugated hose samples with varying textures and colors. Panel 2 displays the pressure-bearing section samples, exhibiting different surface patterns and textures. Panel 3 presents the copper tube samples, showing distinct surface characteristics and colors. Each panel provides a detailed view of the microscopic structure of the samples after 168 hours of air exposure.Microscopic image of the sample after 168 hours of air exposure. Source (s): Authors’ own work