| Nature of coupon | Acid | Rate Constant K (day−1) | Half-life, t1/2 (days) |
| Uncoated | 0.05M HCl | 0.0123 | 56.3 |
| Coated | 0.05M HCl | 0.0052 | 113.3 |
| Uncoated | 0.05M HNO3 | 0.0323 | 21.5 |
| Coated | 0.05M HNO3 | 0.0169 | 41.0 |
| Uncoated | 0.05M HClO4 | 0.0133 | 52.1 |
| Coated | 0.05M HClO4 | 0.0205 | 43.6 |