Surface preparations and durability of iron-based shape memory alloy adhesively-bonded joints

• Published in: International journal of adhesion and adhesives Vol. 125; p. 103439
• Main Authors: Pichler, Niels, Wang, Wandong, Poulis, Johannes A., Ghafoori, Elyas
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.07.2023
• Subjects: Durability; Iron-based shape memory alloy; Primers and coupling agents; Surface treatment; Durability; Primers and coupling agents; Iron-based shape memory alloy; Surface treatment
• ISSN: 0143-7496; 1879-0127
• DOI: 10.1016/j.ijadhadh.2023.103439

Developing a bonded prestressed solution for strengthening structures utilizing an iron-based shape memory alloy (Fe-SMA), is of significant interest. This study is the first systematic investigation of adhesively-bonded Fe-SMA joints to achieve complete cohesive failure, which is an essential prerequisite for bond integrity. The Fe-SMA surface was prepared by combining UV/ozone exposure (UV), sol–gel (SG), and primers (PC, PNC), and the failure mode of the joint was investigated using the floating-roller peel test. Furthermore, the joint durability was studied through artificial aging using a salt spray cabinet. Cohesive failure was obtained for all investigated adhesives, and the effect of every surface preparation step was described. The application of sol–gel was found to be a crucial step in obtaining complete adhesive failure. •Surface preparations for adhesive bonding of a new Fe-SMA are tested.•Cohesive failure is obtained for four different adhesives.•A primer and its non-chromatic alternative are tested and found to be equivalent.•Sol-gel is identified to be crucial for achieving cohesive failure with Fe-SMA.