Fundamental understanding of the effect of alloying elements on the corrosion resistance of rapidly solidified Mg alloys. Annual report No. 2, 1 November 1986-31 October 1987
During the second year of this project, progress was made in the following areas concerned with the effect of alloying elements on the corrosion resistance of RSP Mg alloys: (1) development of the surface-reflection x-ray spectroscopic technique (ref1EXAFS) to carry out structural studies on the films on Mg alloys that control corrosion was completed and applied in measurements at the oxygen K-edge of surface films on high-purity Mg and AZ61 Mg alloys. The existence of magnesium hydroxide on these surfaces was found. (2) Electrochemical studies of the effect of A1, Zn, Ce, Nd, Y, Mn, Li, and Ca in melt-spun Mg alloy ribbons on corrosion behavior were carried out. The corrosion rate decreased with increased percentage of A1 and small additions of Zn. It was found that rapid solidification improves the resistance of the alloy studied (AZ61) to localized C1/sup -/ attack. (3) Surface analytical studies found that only Li and Ca in the RSP Mg alloys have a tendency to be enriched in the films on these alloys. Hydroxides and carbonates were also found in the surface films along with oxides.
- Research Organization:
- Johns Hopkins Univ., Baltimore, MD (USA)
- OSTI ID:
- 5186561
- Report Number(s):
- AD-A-189385/8/XAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CORROSION RESISTANT ALLOYS
SOLIDIFICATION
MAGNESIUM ALLOYS
CORROSION RESISTANCE
CALCIUM
CARBONATES
CERIUM
ELECTROCHEMISTRY
FABRICATION
HYDROXIDES
LITHIUM
OXIDES
PROGRESS REPORT
SURFACE PROPERTIES
ZINC
ALKALI METALS
ALKALINE EARTH METALS
ALLOYS
CARBON COMPOUNDS
CHALCOGENIDES
CHEMISTRY
DOCUMENT TYPES
ELEMENTS
HYDROGEN COMPOUNDS
METALS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
RARE EARTHS
360105* - Metals & Alloys- Corrosion & Erosion