Table 1 Criteria for UDC stage classification based on percentage of porosity and thickness

From: Unsupervised machine learning for automated corrosion staging using optical microscopy images

UDC Stage

Porosity (%)

Thickness (μm)

1

0–2

0–15

2

2–10

15–30

3

10–30

30–90

4

>30

>90

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