Corrosion behaviour of magnesium alloys with RE additions in sodium chloride solutions
Research output: Journal contributions › Conference article in journal › Research › peer-review
Authors
The corrosion performance of new creep resistant magnesium-rare earth alloys was studied and related to its microstructure and chemical composition. The commercial alloy MEZ™ was used as reference. The alloys were produced by the Squeeze Cast Technique. Corrosion was studied in two media: ASTM Water (mild medium) and in 3.5% NaCl at pH 11 (strong medium) by measuring electrochemical polarization curves and by examination of the pitting morphology. Mg-Al-RE alloys had the best corrosion resistance in mild medium. In the aggressive medium, the reference alloy with high RE-content was the best, followed by the Mg-Al-RE alloys. High ratios of Fe/Mn were found detrimental for the corrosion properties of the alloys, especially in strong media. The microstructure played an important role: the eutectic phases of the alloys were cathodic to the matrix and acted as barriers against the propagation of the pitting corrosion. Filiform corrosion was observed additionally in the Mg-Al-RE alloys.
| Original language | English |
|---|---|
| Journal | Materials Science Forum |
| Volume | 419-422 |
| Issue number | II |
| Pages (from-to) | 867-872 |
| Number of pages | 6 |
| ISSN | 0255-5476 |
| DOIs | |
| Publication status | Published - 15.03.2003 |
| Externally published | Yes |
| Event | Second Osaka International Conference on Platform Science and Technology for Advanced Magnesium Alloys 2003 - Osaka, Japan Duration: 26.01.2003 → 30.01.2003 Conference number: 2 |
- 3.5% NaCl, ASTM Water, Filiform corrosion, Magnesium, Microstructures, Pitting corrosion, Polarization curves, Rare earths, Squeeze cast
- Engineering