Important Explorations on Surface Corrosion of the Copper Coins Sourced from the Qing Dynasty

Figure 10

Typical FESEM morphologies and element distributions of the etched Ql coin: near-reticulated (a) and reticulated (b) structures, surface microcracks on reticulated structures (c), and dendritic surface cracks (d). Oxygen distribution (e) and microcracks on the dense surface (f).

(a)

(b)

(c)

(d)

(e)

(f)