| Al 1050 | I corr values (nanoamp/cm2) for 30 min | I corr values (nanoamp/cm2) for 60 min |
| Duplex nickel + Hexavalent chromium | 81.5 | 175.8 |
| Electroless nickel + Duplex nickel + Hexavalent chromium | 329.0 | 437.5 |
| Duplex nickel + Trivalent chromium | 540.1 | 576.5 |
| Electroless nickel + Duplex nickel + Trivalent chromium | 595.8 | 635.7 |
| Al 6061 | I corr values (nanoamp/cm2) for 30 min | I corr values (nanoamp/cm2) for 60 min |
| Duplex nickel + Hexavalent chromium | 18.34 | 75.21 |
| Electroless nickel + Duplex nickel + Hexavalent chromium | 43.97 | 82.38 |
| Duplex nickel + Trivalent chromium | 23.56 | 57.42 |
| Electroless nickel + Duplex nickel + Trivalent chromium | 112.6 | 279.5 |