Corrosion Resistance of Metal Matrix Composites.
Abstract
This program examined the relationship between processing and chemistry in continuous fiber graphite/aluminum alloy metal mix composites (G/Al MMCs) with particular attention to subsequent effects on electrochemical behavior. In general, anodic polarization of (G/Al MMCs) compared well with mixed electrode model predictions. Deviations were associated with commercial fiber type and interfacial intermetallics. At high anodic overpotentials, graphite fiber oxidation and subsequent crevice formation resulted in large deviations from mixed-potential theory. Zinc ion implantation of graphite fibers was found to reduce the corrosion rate by a factor of twenty in NaCl solutions. Al4C3 hydrolysis was not observed on the time scale of the polarization studies performed. The scanning potential microprobe (SPM) was used to identify cathodic and anodic sites in situ for both model G/Al composites and commercial 0-90 deg interlaminar G/6061 Al MMCs. Corrosion, Graphite Aluminum Metal Matrix Composites.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1992
- Accession Number
- ADA258370
Entities
People
- R. M. Latanision
Organizations
- Massachusetts Institute of Technology