Failure Mechanisms of Adhesively Bonded Aluminium for Spacecraft Applications
نویسندگان
چکیده
The surface characteristics of an aluminium alloy treated with a commercial chromate pretreatment have been studied by SAM, EDX and XPS. XPS indicates that the chromium is present in the conversion coating as both Cr(III) and Cr(VI) species, and that other components are present at the conversion coating surface, some in a reduced form. The deposition of the chromate layer is compromised by the presence of the intermetallics in the alloy. The layer is cracked at the micrometre scale, presumably as a result of drying on removal from the bath. Failure of chromate treated aluminium bonded in lap shear configuration using a structural epoxy paste is shown to be cohesive in the adhesive but very close to the conversion coating/adhesive interface but alternating from on side of the glue line to the other.
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