Microstructure and Mechanical Properties of the Butt Joint in High Density Polyethylene Pipe

Figure 6

SEM images of W-PE10 weld seam area after etching by potassium permanganate based etchant (KMnO₄/H₂SO₄). Scale bar is 1 mm (a), 50 μm (b), 10 μm (c), and 1 μm (d).

(a)

(b)

(c)

(d)