Corrosion Protection of Metal Matrix Composites
Abstract
Corrosion protection of Al alloys, Al-based metal matrix composites (MMCs), and Al-Li alloy by conversion coatings, anodized layers, polymer coatings, and chemical passivation in CeCl3 has been evaluated in a simulated marine environment (0.5 N NaCl) by electrochemical impedance spectroscopy (EIS). Conversion coatings, anodizing, polymer coatings have been evaluated for MgAZ31B. Chromate conversion coatings (Alodine 600) provided corrosion protection for Al/SiC and Al/Gr MMCs, but were not as effective as for Al 6061. For Al/SiC it was observed that sulfuric acid anodizing did not produce the corrosion resistance obtained for the Al 6061. The corrosion resistance for hard anodized Al/SiC was less than that for conventional anodized Al/SiC. Keywords: Corrosion protection, Polymer coatings, Conversion coatings, Anodizing Al alloys, Magnesium, Localized corrosion, Passivation, Electrochemical techniques.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1990
- Accession Number
- ADA222951
Entities
People
- F. Mansfeld
- H. Shih
- Sharon Lin
Organizations
- University of Southern California