Accession Number : ADA332029

Title :   Corrosion of Metal Matrix Composites.

Descriptive Note : Final rept. Aug 96-Aug 97,

Corporate Author : DELAWARE UNIV NEWARK DEPT OF MATHEMATICAL SCIENCES

Personal Author(s) : Hall, Ian W.

PDF Url : ADA332029

Report Date : NOV 1997

Pagination or Media Count : 43

Abstract : Long term immersion testing and short term electrochemical testing have been carried out on two metal matrix composites and their corresponding unreinforced alloys. The composites were 15% alumina reinforced 6061-Al alloy and an Al-Si alloy reinforced with 20, 30, 40 or 55% SiC particles. It is shown that the pitting potentials are essentially independent of the presence or absence of reinforcement particles, as well as of their volume fraction. Corrosion i shown to be generally more severe in the composites than in the unreinforced alloy and weight loss rates may be 3 or 4 times greater. The presence of intermetallic particles strongly affects the corrosion and titanium/zirconium-rich particles, believed to arise as a consequence of the processing route, have been shown to have a particularly deleterious effect on corrosion of the 6061-Al alloy.

Descriptors :   *METAL MATRIX COMPOSITES, *CORROSION RESISTANCE, CORROSION, ALUMINUM ALLOYS, ELECTROCHEMISTRY, PARTICLES, ZIRCONIUM, TITANIUM, SILICON CARBIDES, IMMERSION, INTERMETALLIC COMPOUNDS, PITTING.

Subject Categories : Physical Chemistry
      Laminates and Composite Materials
      Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE