| No. | Coating thickness (μm) | Salt spray |
| 1 | 10 | 0.5 h |
| 2 | 20 | 12 h |
| 3 | 28 | 40 h |
| 4 | 43 | 70 h |
| 5 | 53 | 90 h |
| 6 | 68 | 105 |
| 7 | 92 | 120 |
| 8 | 10 | 0.5 h |