Table 5 EDS analysis of corrosion layers on the glaze surface (wt%)
Region | C | O | Mg | Al | Si | S | Cl | K | Ca | Fe | Zr | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Original glaze | / | 42.6 | 0.4 | 11.9 | 31.9 | / | / | 3.0 | 10.4 | 0.3 | / | |
Inner corrosion layer | Translucent matte region | / | 27.5 | / | 9.7 | 35.5 | / | / | 4.8 | 15.3 | 1.8 | 5.3 |
Intermediate corrosion layer | Pale-yellow matte region | 12.3 | 39.0 | / | 5.4 | 10.4 | 0.4 | / | 0.9 | 2.3 | 26.5 | 2.8 |
Brown reflective region | 4.7 | 33.8 | / | 5.9 | 13.2 | 0.4 | 0.2 | 0.6 | 0.6 | 40.6 | / | |
Outer corrosion layer | Brown matte region | 4.9 | 25.5 | / | 1.3 | 0.9 | 0.4 | / | / | / | 67.1 | / |
Black–brown shell-like substance | 10.9 | 8.4 | / | 0.8 | 1.3 | 0.3 | / | 0.1 | 0.2 | 78.3 | / | |
Spherical objects on corrosion layers | 35.3 | 31.1 | / | 0.7 | 10.5 | 0.4 | 0.1 | 0.2 | 0.3 | 21.4 | / | |
