Durability of Adhesively Bonded Coated Steels

Adhesive joint durability was compared for the following sheet steels: bare, hot-dip galvanized, electrogalvanized, zinc-nickel electroalloyed, zinc-iron electroalloyed, Zincrometal, Zincroplex/electrogalvanized, Zincroplex/zinc-nickel electroalloyed, and chromium oxide electrogalvanized. Experiments monitored lap-shear joint strength with exposure to a corrosive environment. Results show durability depends on the corrosion resistance of the steel sheet. Durability was generally greater with coated steel sheet and particularly with chromium oxide electrogalvanized steels.