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The electrochemical impedance (EIS) parameter for ROPU, Ca-ROPU, and Mg-ROPU coating materials under 3.5 wt. % NaCl solution for a period of 7 days.
| ROPU | ||||
|---|---|---|---|---|
| Immersion Time | Rs (Ω) | Rct (KΩ) | Capacitance (pF) | χ2 |
| 1 | 121 | 8.45 | 182 | 0.950 |
| 3 | 136 | 7.30 | 189 | 1.036 |
| 5 | 142 | 6.35 | 194 | 1.173 |
| 7 | 143 | 6.06 | 198 | 1.560 |
| Ca-ROPU | ||||
| 1 | 138 | 15.3 | 64.9 | 0.610 |
| 3 | 148 | 11.7 | 63.3 | 0.391 |
| 5 | 279 | 11.11 | 74.4 | 1.133 |
| 7 | 421 | 5.32 | 80.0 | 1.475 |
| Mg-ROPU | ||||
| 1 | 427 | 66.5 | 242 | 1.59 |
| 3 | 424 | 63.7 | 263 | 1.51 |
| 5 | 447 | 59.6 | 265 | 0.82 |
| 7 | 420 | 46.3 | 260 | 0.59 |
