2011 Volume 84 Issue 9 Pages 313-320
Structural adhesives adopted for replacing spot welding in automotive industry are usually applied to the steel substrates contaminated with various oils such as ship-out oil, stamping or drawing oils. This paper describes the effects of epoxy adhesive composition and surface structure of the oily galvanized steel substrates on the adhesive bonding. Interfacial analysis by XPS and FTIR has disclosed that the preferential adsorption of amino curing agents at the interface plays an important role and that the bond durability of hot-dipped galvanized steel has decreased due to the surface segregation of both lead and aluminum which stimulates intergranular corrosion of zinc during hot water immersion.
