Degradation of adhesive bonded aluminium in corrosive environment has been investigated in terms of tensile strength as a function of pre-treatment of the surface and specimen design. The pre-treatment was found to play a major role in the degradation mechanism of adhesive bonded joints. Underfilm corrosion at the substrate/adhesive interface was observed on extruded and degreased specimen, causing degradation in the tensile strength. Etching and hot AC anodizing of the aluminium surface improved the adhesion and the underfilm corrosion resistance on non-ridged specimens. The result show that the pre-treatment plays a major role in the degradation mechanism of adhesive bonded joints. In the as extruded condition, underfilm corrosion in the form of uniform etching of a thin surface region caused degradation of the bonded joint. Removal of the corrosion susceptible surface of the substrate material by different pre-treatment methods improved the corrosion resistance. On etched and etched and desmutted specimens, localized corrosion occurring underneath the adhesive was found to cause subsequent volume expansion and delamination in a large region. Etching and hot AC anodizing improved the corrosion resistance further and at the same time improved the adhesion, thus reducing the localized corrosion and subsequent further delamination. It was also observed that the specimen design can be detrimental when it comes to underfilm corrosion susceptibility of the bonded joint. The ridged surface exhibited uniform corrosion in the entire bonded region after corrosion initiation and exposure in humidity cabinet.
Adhesive bonding of aluminium
Aluminium-Klebverbindung
2001
5 Seiten, 11 Bilder, 8 Quellen
Aufsatz (Konferenz)
Englisch
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