Research Article
Morphology Characterisation of Pitting Corrosion on Sensitized Austenitic Stainless Steel by Digital Image Analysis
Table 3
Variation of pit width and depth with increasing exposure period.
| Pit geometry | Heat treatment | Parameter (m) | Exposure Period (h) | 48 | 120 | 168 | 216 | 312 |
| Irregular | I | Width | 7.12 | 14.88 | 11.73 | 5.74 | — | Depth | 33.17 | 27.19 | 16.31 | 27.47 | — | II | Width | 7.29 | 9.52 | 6.01 | 7.77 | 8.15 | Depth | 11.01 | 9.80 | 23.32 | 15.19 | 25.26 | III | Width | — | 6.65 | 6.35 | 7.04 | 6.96 | Depth | — | 17.15 | 27.79 | 7.15 | 12.84 |
| Conical | I | Width | 4.58 | 9.01 | 6.86 | 4.65 | 4.72 | Depth | 21.46 | 14.59 | 6.29 | 11.77 | 18.60 | II | Width | — | 6.51 | 4.79 | 4.57 | 5.02 | Depth | — | 6.88 | 16.81 | 13.02 | 15.29 | III | Width | — | 4.86 | 5.01 | 6.30 | 6.35 | Depth | — | 20.62 | 19.60 | 6.46 | 8.78 |
| Transition region A | I | Width | 4.74 | 6.89 | 6.64 | 4.38 | 6.34 | Depth | 14.02 | 7.34 | 8.57 | 14.64 | 14.31 | II | Width | 5.50 | 6.66 | 4.39 | 5.53 | 6.22 | Depth | 10.50 | 6.88 | 15.00 | 10.68 | 12.99 | III | Width | 4.37 | 5.71 | 4.17 | 6.06 | 5.80 | Depth | 20.15 | 9.65 | 13.43 | 6.18 | 7.91 |
| Hemispherical | I | Width | 4.82 | 6.02 | 5.89 | 3.91 | 3.67 | Depth | 11.19 | 6.85 | 6.99 | 8.66 | 14.02 | II | Width | 5.99 | 5.76 | 5.07 | 5.55 | 6.38 | Depth | 9.16 | 6.32 | 10.13 | 7.54 | 10.28 | III | Width | 3.24 | 4.97 | 5.01 | 5.54 | 4.88 | Depth | 13.09 | 8.33 | 9.48 | 5.59 | 7.00 |
| Transition region B | I | Width | 5.05 | 5.54 | 5.16 | 4.74 | 4.78 | Depth | 5.40 | 5.21 | 4.73 | 5.16 | 5.91 | II | Width | 5.65 | 4.52 | 6.60 | 6.36 | 6.37 | Depth | 6.30 | 5.29 | 7.39 | 6.51 | 7.55 | III | Width | 4.79 | 5.10 | 5.12 | 3.19 | 4.72 | Depth | 5.64 | 6.01 | 6.14 | 5.98 | 4.91 |
| Cylindrical | I | Width | — | — | — | — | — | Depth | — | — | — | — | — | II | Width | — | — | — | — | — | Depth | — | — | — | — | — | III | Width | — | — | — | — | — | Depth | — | — | — | — | — |
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