A Round-Robin Evaluation of Adhesive Bonding Processes Related to the Shelter Industry.

摘要

Metal parts of 5052 H 34 and 6061 T-6 aluminum alloys were supplied to five companies with the request to treat the parts in their production cleaning facilities. A portion of the parts were to be bonded as prepared and others were to be primed and then bonded. The standard cleaning method was the FPL etch. The primer used was BR 127, with two companies supplying extra panels bonded with FM 47. The adhesive used was Reliabond 7114, with the exception of one set which was bonded with Hysol En 9601 adhesive. Both lap shear and wedge test panels were prepared, bonded, and supplied for testing. Lap shear tests were run at 23 C(73F), 60 C(140F) and 93 C(200F). Lap shear tests at 60 C after 100 hr and 1000 hr immersion in 60 C water were run to predict durability. ASTM D 2919 durability tests at 60 C/95%RH and wedge tests at 60 C/95-100%RH were also carried out. The results indicate that the FM 47 primer is not as thickness- sensitive as the BR 127 primer. The 5052 H-34 aluminum alloy is not as sensitive to stress-corrosion cracking at the interface as is the 6061 T-6 alloy. The use of a primer does not significantly improve the durability of bonds to 5052H-34 alloy. However, to improve the durability of bonds to 6061 T-6 alloy, a primer is necessary.