Effect of Surface Exposure Time (Set) on Strength of Adhesive Bonds to Aluminum

摘要

Surface exposure times (SET) at 23 C and 50% RH for 2024-T3 aluminum subsequently bonded with EC-2214 adhesive did not affect the bond strength for SET up to 30 days. SET at 54 C and 95 + or - 5% RH gave much lower bond strengths that did not further change with increasing SET. The difference in strength is believed to be due to the formation of a hydrated aluminum oxide on the aluminum surface at 54 C and 95 + or - 5% RH. This hydrated oxide functions as a weak boundary layer. (Author)