Effects of graphite-epoxy composite materials on the corrosion behavior of aircraft alloys. Phase report
Technical Report
·
OSTI ID:7346640
The electrochemical approach was used to show the nature of the galvanic corrosion when graphite-epoxy composite materials are coupled to aluminum and titanium alloys. An open circuit potential difference of one volt was obtained in 3.5% NaCl solution between the composite and 7075-T6, 7075-T651 and 5052-H38 alloys. This potential difference provides a driving force for corrosion and is cause for concern. The Ti-6-4 showed a difference of about 0.3 volt for the unpolished as received material. Corrosion current data (zero impedance technique) indicate that aluminum alloys and cadmium plate are much more reactive than Ti-6-4 when coupled to graphite-epoxy. This technique provides a means of ranking the severity of this corrosion problem for various aircraft alloys. Flatwise tensile data indicate significant strength losses when graphite-epoxy composite sandwich specimens are exposed to ASTM 5% salt spray and synthetic sea water + SO/sub 2/ spray environments.
- Research Organization:
- Naval Air Development Center, Warminster, Pa. (USA). Air Vehicle Technology Dept.
- OSTI ID:
- 7346640
- Report Number(s):
- AD-A-010127; NADC-75031-30
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
360305 -- Composite Materials-- Corrosion
Erosion
& Degradation-- (-1987)
360604 -- Materials-- Corrosion
Erosion
& Degradation
ALKALI METAL COMPOUNDS
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
AQUEOUS SOLUTIONS
CARBON
CHALCOGENIDES
CHLORIDES
CHLORINE COMPOUNDS
COMPATIBILITY
COMPOSITE MATERIALS
CORROSIVE EFFECTS
DISPERSIONS
ELEMENTS
EPOXIDES
HALIDES
HALOGEN COMPOUNDS
MIXTURES
NONMETALS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SODIUM CHLORIDES
SODIUM COMPOUNDS
SOLUTIONS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TITANIUM ALLOYS
TITANIUM BASE ALLOYS
360105* -- Metals & Alloys-- Corrosion & Erosion
360305 -- Composite Materials-- Corrosion
Erosion
& Degradation-- (-1987)
360604 -- Materials-- Corrosion
Erosion
& Degradation
ALKALI METAL COMPOUNDS
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
AQUEOUS SOLUTIONS
CARBON
CHALCOGENIDES
CHLORIDES
CHLORINE COMPOUNDS
COMPATIBILITY
COMPOSITE MATERIALS
CORROSIVE EFFECTS
DISPERSIONS
ELEMENTS
EPOXIDES
HALIDES
HALOGEN COMPOUNDS
MIXTURES
NONMETALS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SODIUM CHLORIDES
SODIUM COMPOUNDS
SOLUTIONS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TITANIUM ALLOYS
TITANIUM BASE ALLOYS