| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1472114 | Corrosion Science | 2006 | 16 Pages |
The changes in the corrosion characteristics of stainless steel OC4004 in 0.1 M HNO3 after electrodeposition of thin Al and Ce oxide films on it has been investigated. The Ce2O3–CeO2 layers have been found to possess a pronounced stabilizing effect on the steel passive state and on its corrosion resistance, respectively, whereas the Al2O3 layers do not improve considerably the corrosion behaviour of the SS/Al2O3 system. A twice-lower corrosion current was observed with a ternary SS/Al2O3/Ce2O3–CeO2 system in the passive region, while the zones of potentials, where the steel is in a stable passive state, are not changed. The obtained results permit the assumption that the cerium oxides layer acts as an effective cathode playing a determining role with respect to the improvement of the corrosion behavior of the steel. It has been concluded that when the SS/Al2O3/Ce2O3–CeO2 system is used in media containing nitric acid, the corrosion will proceed at potentials where the passive state of steel would not be disturbed.
