Abstract
The corrosion of Fe-Mo alloys containing up to 40 wt.% Mo was studied over the temperature range 600-980‡C in a H2/H2O/H2S mixture having a sulfur pressure of 10-5 atm. and an oxygen pressure of 10-20 atm. at 850‡C. All alloys were two-phase, consisting of an Fe-rich solid solution and an intermetallic compound, Fe3Mo2. The scales formed on Fe-Mo alloys were bilayered, consisting of an outer layer of iron sulfide (FeS) and of a complex inner layer whose composition and microstructure were a function of the reaction temperature and of the Mo content of the alloys. No oxides formed under any conditions. The corrosion kinetics followed the parabolic rate law at all temperatures. The addition of Mo caused only a slight decrease of the corrosion rate. Platinum markers were always located at the interface between the inner and outer scales, indicating that outer scale growth was primarily due to outward diffusion of iron, while the inner scale growth had a contribution from inward diffusion of sulfur. © 1992 Plenum Publishing Corporation.
| Original language | English |
|---|---|
| Pages (from-to) | 389-411 |
| Journal | Oxidation of Metals |
| Volume | 37 |
| Issue number | 5-6 |
| DOIs | |
| Publication status | Published - Jun 1992 |
| Externally published | Yes |
Bibliographical note
Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].Research Keywords
- bilayered scales
- Chevrel phase
- Fe-Mo alloys
- FeMo2S4
- sulfidation