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Roughness parameter values of tested surface conditions: arithmetical mean deviation (Ra), the average maximum peak to valley height (Rz), the root mean square slope (R∆q).
| Specimen Designation (Type of Surface) | Ra (µm) | Rz (µm) | R∆q (-) |
|---|---|---|---|
| as received | 0.22 | 2.30 | 0.15 |
| PEP | 0.11 | 1.00 | 0.04 |
| PPEP | 0.10 | 1.00 | 0.04 |
