Durability of structural adhesive bonds (a review)

Conference · Sat Jan 01 00:00:00 EST 1977

OSTI ID:7305746

DeLollis, N J

Real time data have been compiled showing the durability of most of the high strength adhesive types used in structural assemblies. These include epoxies, nitrile/epoxies, epoxy/phenolics, nitrile/phenolics, acrylics and two elastomers: polysulfides and silicones. Various prebond surface treatments for aluminum were also evaluated. The exposure environments included shelf aging, marine, jungle, industrial environments and some accelerated and stressed conditions for comparison. These data indicate that the most durable adhesive for all conditions at temperatures as high as 350/sup 0/F is the nitrile-modified phenolic. The polyamide cured epoxies (usually considered a general purpose type) performed very well for periods up to eleven years and under a wide variety of conditions. Nylon/epoxy adhesives did well on continuous exposure to 250/sup 0/F and outdoor exposures but could not withstand conditions of high humidity and water immersion. Nitrile epoxies survived all environments acceptably except for marine climate and continuous immersion in water. Epoxy phenolics in the unstressed condition survived all environments acceptably except continuous exposure to 350/sup 0/F. The polysulfide bond to aluminum did well in all environments. However, the bond to cold rolled steel corroded at the steel interface. The silicone bonds were cohesively weak but the bond to either aluminum or steel was not degraded by any of the environments. Applied stress definitely accelerated bond degradation and the examples of accelerated aging used were not as severe as long term aging. 11 tables.

• Research Organization: Sandia Labs., Albuquerque, NM (USA)
• DOE Contract Number: EY-76-C-04-0789
• OSTI ID: 7305746
• Report Number(s): SAND-76-9082; CONF-770407-3
• Resource Relation: Conference: 22. national SAMPE symposium/exhibition, San Diego, CA, USA, 26 Apr 1977
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ADHESIVES
PERFORMANCE TESTING
ADHESION
ALUMINIUM
DATA
ELASTOMERS
ENVIRONMENT
EPOXIDES
HIGH TEMPERATURE
HUMIDITY
NYLON
ORGANIC POLYMERS
STEELS
ALLOYS
ELEMENTS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
METALS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYAMIDES
POLYMERS
TESTING
360405* - Materials- Polymers & Plastics- Degradation & Erosion- (-1987)