Galvanic corrosion of aluminum-matrix composites. Technical report No. 2, 1 Mar-31 Dec 90

Technical Report · Fri Feb 01 04:00:00 EST 1991

OSTI ID:5546720

Hihara, L H; Latanision, R M

Galvanic-corrosion rates of Al-matrix composites were high in aerated chloride-containing solutions. Oxygen reduction was found to be the primary cathodic reaction. Aluminum corroded by pitting. The type of noble constituent (i.e., graphite, SiC, or TiB{sub 2}) also affected galvanic-corrosion rates. For example, results indicated that the galvanic-corrosion rate of Al should be about 30 times greater when coupled to graphite than when coupled to SiC or TiB{sub 2}. In dearated solutions, galvanic corrosion was negligible even if chlorides were present. The galvanic-corrosion rates were determined using the zero-resistance ammeter technique and from potentiodynamic polarization diagrams of ultrapure Al, 6061-T6 Al, graphite fiber, SiC, TiB2, and a commercial graphite fiber/6061-T6 Al metal-matrix composite.

• Research Organization: Massachusetts Inst. of Tech., Lexington, MA (USA)
• OSTI ID: 5546720
• Report Number(s): AD-A-232138/8/XAB; CNN: N00014-89-J-1588
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360604* -- Materials-- Corrosion
Erosion
& Degradation
ALLOYS
ALUMINIUM ALLOYS
BORIDES
BORON COMPOUNDS
CARBIDES
CARBON
CARBON COMPOUNDS
CARBON FIBERS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COMPOSITE MATERIALS
CORROSION
ELECTROCHEMICAL CORROSION
ELEMENTAL MINERALS
ELEMENTS
FIBERS
GRAPHITE
HALIDES
HALOGEN COMPOUNDS
MATERIALS
MATRIX MATERIALS
MINERALS
NONMETALS
REDUCTION
SILICON CARBIDES
SILICON COMPOUNDS
TITANIUM BORIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS