Abstract
Saltwater contamination, such as human factored sweat dew and breath moisture, is studied to explain the mechanisms of weak bond formation in carbon fiber reinforced plastics (CFRP) epoxy adhesive joints. First, a mechanism of epoxy ring consumption by is proposed to explain the reduction of covalent bond density at the adhesion interphase in a function form of pH alkaline drift. Second, a double cantilever beam test (DCB test) is applied to saltwater-polluted CFRP adhesion samples to prove the formation of the contamination-triggered weak bonds. Applying the data to the function, the thickness of the contamination layer is estimated to imply that adhesive flow in the adhesion process dissipates the layer to make the weak bond formation a statistical phenomenon.
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