A Fundamental Understanding of the Effect of Alloying Elements on the Corrosion Resistance of Rapidly Solidified Mg Alloys
Abstract
This third and final report describes progress made in the following areas concerned with the effect of alloying elements on the corrosion resistance of RSP Mg alloys: 1) A new x-ray absorption technique (reflEXAFS) was developed that found that the more corrosion resistant an alloy was, the higher the Mg(OH) 2 content and the less crystalline were the films on its surface, as predicted from theoretical considerations developed in the first year; 2) Electrochemical studies were carried out on the effect of Al, An, Ce, Nd, Y, Mn, Li and Ca in melt-spun Mg ribbons and an extruded alloy made from crushed RSP ribbons on corrosion behavior. The corrosion rate decreased with increased percentages of Al and small additions of Zn. It was found that rapid solidification improves the resistance of the alloy studied (AZ61) to localized Cl- attack; 3) Surface analytical studies found that only Li and Ca have a tendency to be enriched in the films on RSP alloys. Rapidly solidified alloys, Corrosion, EXAFS, Electrochemistry, Localized corrosion, Passivity.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 23, 1988
- Accession Number
- ADA205196
Entities
People
- Ameya Joshi
- D. K. Tanaka
- G. G. Long
- G. L. Makar
- J. Kruger
Organizations
- Johns Hopkins University